JP2015010473A - Valve maintenance facility and valve maintenance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a stop period of a compressor when a load control valve is processed for maintenance to be shortened as much as possible and at the same time an operator's burden to be reduced and further enable the load control valve to be safely processed for maintenance.SOLUTION: A valve maintenance facility 21 according to an aspect of the present invention is facility used for performing a maintenance work for a load control valve of a compressor and comprises: a pressure tank 22 connected to the load control valve removed from the compressor through a pipe arrangement; a pressure gauge 23 for displaying a supplied pressure of compressed air with respect to the load control valve; an unloader pressure gauge 24; and an inlet valve 25a and a purge valve 25b for adjusting the supplied pressure of compressed air with respect to the load control valve. The pressure tank 22 simulates a discharging side pressure tank of the compressor and supplies compressed air to the load control valve. The unloader pressure gauge 24 displays that the load control valve is kept at the unloaded condition. The pressure gauge 23 displays the supply pressure of compressed air as a working pressure for the load control valve for a period in which the unloader pressure gauge 24 displays the unloaded state.

Description

  The present invention relates to a valve maintenance facility and a valve maintenance method for maintaining a load control valve that controls a load of a compressor that compresses and delivers gas.

  Conventionally, in factories such as steelworks, tools or machines that operate using compressed gas as a power source (hereinafter collectively referred to as gas pressure equipment) are often used. A compressor such as a reciprocating compressor (reciprocating compressor) is installed. For example, a reciprocating compressor includes a cylinder provided with a suction valve and a discharge valve, a piston that reciprocates in the cylinder, and a drive unit such as a motor that is a power source of the piston. The reciprocating compressor receives gas obtained in actual operation of equipment such as coke oven gas (hereinafter referred to as actual gas) from a suction valve into a cylinder through piping. Next, the reciprocating compressor pressurizes and compresses the actual gas in the cylinder by the reciprocating motion of the piston, and as a result, generates compressed gas. The reciprocating compressor discharges the obtained compressed gas from the discharge valve of the cylinder, and appropriately supplies the compressed gas to the gas pressure device through piping or the like.

  In addition, a compressor such as a reciprocating compressor switches an operation mode to a load operation or a no-load operation according to a gas pressure on the discharge side (hereinafter referred to as a discharge side pressure), thereby performing an energy saving operation. Yes. In such a compressor, for example, as disclosed in Patent Document 1, a pressure adjustment valve for switching the operation mode of the compressor to a load operation or a no-load operation according to the pressure on the discharge side is attached. . When the pressure on the discharge side is larger than the pressure set value preset for the compressor, the pressure regulating valve is opened and sends high pressure gas to the suction valve side of the compressor. To keep the intake valve open. As a result, the compressor is controlled to a state in which the load applied to the drive unit and the like is reduced as much as possible, and performs no-load operation. On the other hand, when the pressure on the discharge side is equal to or lower than the pressure set value of the compressor, the pressure regulating valve is closed and stops sending high-pressure gas to the compressor. Thereby, the maintenance of the open state of the suction valve is released. As a result, the compressor is controlled so as to be loaded and performs a load operation.

JP 2009-264218 A

  In general, the pressure setting value used as the switching condition of the operation mode of the compressor is determined by adjusting the operating pressure of the pressure adjusting valve (that is, the load control valve) that controls the load of the compressor as described above. The adjustment of the operating pressure of the load control valve is conventionally performed by structurally adjusting the load control valve while supplying actual gas from the compressor body to the load control valve through piping or the like.

  In such a conventional adjustment operation, there is a possibility that an actual gas containing carbon monoxide or the like may leak from the load control valve (for example, from a portion where the seal member is interposed at the seam of the side wall) at the time of adjusting the operating pressure. . For this reason, there is a danger in adjusting the operating pressure of the load control valve and checking the function (hereinafter collectively referred to as maintenance). Furthermore, from the viewpoint of ensuring the safety of the worker, it is essential to wear an air supply mask such as an airline mask. Wearing this air supply mask is a burden on the operator in the maintenance work of the load control valve.

  Moreover, conventionally, the maintenance work of the load control valve has to be performed after the maintenance work of the compressor is completed. For this reason, there is a problem that it takes a long time to stop the operation of the compressor after the maintenance of the load control valve is completed after the compressor is stopped.

  The present invention has been made in view of the above circumstances, and it is possible to shorten the stop period of the compressor when servicing the load control valve as much as possible, and to reduce the burden on the operator and safely control the load. It aims at providing the valve maintenance equipment and the valve maintenance method which can maintain a valve.

  In order to solve the above-described problems and achieve the object, a valve maintenance facility according to the present invention is a valve used for maintenance of a load control valve for controlling the load of the compressor according to the gas pressure on the discharge side of the compressor. In maintenance equipment, supply the compressed air to the load control valve by simulating a discharge side pressure tank that is connected to the load control valve removed from the compressor through a pipe and stores and discharges the compressed gas by the compressor. A pressure tank that adjusts a supply pressure of the compressed air to the load control valve to operate the load control valve, and the load control valve is connected to the compressor according to the supply pressure of the compressed air. An indicator that indicates that the engine has been operated in an unloaded state that can be controlled in a no-load state, and a supply pressure of the compressed air to the load control valve. A period for displaying the fact of loading conditions, the supply pressure of the compressed air, characterized by comprising a pressure gauge for displaying the operating pressure of the load control valve required for the unloading state.

  In the valve maintenance facility according to the present invention, in the above invention, the indicator is an unload pressure gauge that measures and displays an operating pressure of the load control valve required for the unload state. When the load control valve is in the unload state, the supply pressure of the compressed air equivalent to the operating pressure of the load control valve displayed by the unload pressure gauge is displayed.

  In the valve maintenance facility according to the present invention as set forth in the invention described above, the pressure adjusting means adjusts an inflow amount of the compressed air to the pressure tank to increase a supply pressure of the compressed air to the load control valve. And an air vent valve for adjusting a decrease in the supply pressure of the compressed air to the load control valve by adjusting so as to reduce an inflow amount of the compressed air to the pressure tank. Features.

  The valve maintenance facility according to the present invention is characterized in that, in the above invention, the inlet valve and the air vent valve are configured using a needle valve.

  Further, in the above invention, the valve maintenance facility according to the present invention is provided with a cleaning liquid valve that can be opened and closed in a pipe that communicates with the load control valve, and that allows the cleaning liquid to be injected into the load control valve. Features.

  The valve maintenance method according to the present invention is a valve maintenance method for maintaining a load control valve for controlling a load of the compressor in accordance with a gas pressure on a discharge side of the compressor. Compressed air supply step for supplying compressed air from the pressure tank by simulating a discharge-side pressure tank that stores and discharges compressed gas by the compressor, with respect to the load control valve connected to the pressure tank of the facility through piping; Supply air pressure adjustment step of operating the load control valve by adjusting the supply pressure of the compressed air by a pressure adjusting means while displaying the supply pressure of the compressed air to the load control valve on the pressure gauge of the pressure tank And when the load control valve is operated in an unloaded state in which the compressor can be controlled to a no-load state according to the supply pressure of the compressed air, the load control valve An unload state display step for displaying on the indicator a state of the unload state, and a period during which the indicator of the unload state of the load control valve is displayed on the indicator, and the supply pressure of the compressed air is set to the unload state. An operation pressure display step of displaying on the pressure gauge as an operation pressure of the load control valve that is required.

  In the valve maintenance method according to the present invention, in the above invention, the unload state display step uses an unload pressure gauge as the display meter, and the load required for the unload state by the unload pressure gauge is used. The operating pressure of the control valve is measured and displayed, and the operating pressure display step is equivalent to the operating pressure of the load control valve displayed by the unload pressure gauge when the load control valve is in the unload state. The supply pressure of the compressed air is displayed by the pressure gauge.

  In the valve maintenance method according to the present invention as set forth in the invention described above, the supply air pressure adjusting step uses an inlet valve and an air vent valve of the pressure tank as the pressure adjusting means, and the pressure valve Adjusting the increase in the supply pressure of the compressed air to the load control valve by adjusting the inflow amount of the compressed air to the load control valve, and adjusting the inflow amount of the compressed air to the pressure tank by the air vent valve The reduction of the supply pressure of the compressed air to the load control valve is adjusted.

  The valve maintenance method according to the present invention is characterized in that, in the above invention, needle valves are used as the inlet valve and the air vent valve.

  In the valve maintenance method according to the present invention, in the above invention, the cleaning liquid valve provided in a pipe leading to the load control valve is opened and closed to allow the cleaning liquid to be injected into the load control valve. A valve cleaning step of cleaning the load control valve with a cleaning liquid is included.

  According to the present invention, it is possible to shorten the stop period of the compressor when servicing the load control valve as much as possible, and to reduce the burden on the operator and safely maintain the load control valve. .

FIG. 1 is a diagram illustrating a configuration example of a reciprocating compressor in which a pressure regulating valve to be serviced according to an embodiment of the present invention is used. FIG. 2 is a schematic cross-sectional view showing a configuration example of the pressure regulating valve to be maintained in the embodiment of the present invention. FIG. 3 is a view for explaining the opening / closing operation of the pressure regulating valve to be maintained in the present embodiment. FIG. 4 is a diagram illustrating a configuration example of the valve maintenance facility according to the embodiment of the present invention. FIG. 5 is a flowchart showing an example of the valve maintenance method according to the embodiment of the present invention. FIG. 6 is a diagram for explaining the adjustment of the operating pressure of the pressure regulating valve to be maintained in the present embodiment.

  Exemplary embodiments of a valve maintenance facility and a valve maintenance method according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, the present invention will be described by exemplifying a pressure regulating valve of a reciprocating compressor as an example of a load control valve to be maintained, but the present invention is not limited to this embodiment. Moreover, in each drawing, the same code | symbol is attached | subjected to the same component.

(Reciprocating compressor)
First, a reciprocating compressor using a maintenance target pressure regulating valve in an embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration example of a reciprocating compressor in which a pressure regulating valve to be serviced according to an embodiment of the present invention is used. As shown in FIG. 1, the reciprocating compressor 1 includes two compressor bodies 2 and 3, a drive unit 4 of the compressor bodies 2 and 3, an intercooler 5, an after cooler 6, a receiver tank 7, A pressure regulating valve 11. The reciprocating compressor 1 is provided with pipes 8a to 8d that form gas paths. Further, pipes 10a to 10c are provided in the receiver tank 7, the pressure regulating valve 11, and the unloaders 2e, 2f, 3e, and 3f of the compressor bodies 2 and 3, respectively.

  The compressor body 2 is a low-pressure side compressor that performs a first-stage compression process on the actual gas G1 supplied from in-plant equipment such as a coke oven. Specifically, the compressor body 2 has a gas compression mechanism that compresses the gas in the compression chamber by the action of a piston that reciprocates in the cylinder. Gas inlet valves 2a and 2b are provided on the inlet side (lower side) of the gas compression mechanism of the compressor body 2, and discharge valves 2c and 2d are provided on the outlet side (upper side) of the gas compression mechanism. It is done. The compressor body 2 has a pipe 8a connected to the inlet side thereof, and receives the actual gas G1 through the pipe 8a. While the compressor main body 2 operates the gas compression mechanism using the drive unit 4 such as a motor as a drive source, the received actual gas G1 is sucked into the compression chamber from the suction valves 2a and 2b, and by the action of the gas compression mechanism, The actual gas G1 in the compression chamber is pressurized to a predetermined pressure and compressed. The compressed real gas G1 is normally discharged from the compression chamber to the outlet side of the compressor body 2 through the discharge valves 2c and 2d.

  The compressor body 2 has unloaders 2e and 2f on the suction valves 2a and 2b side. Based on the control of the pressure regulating valve 11, the unloader 2e maintains the open state of the intake valve 2a on the inner side (drive unit 4 side) or cancels the maintenance of the open state. Similarly, the unloader 2f maintains the open state of the outer intake valve 2b based on the control of the pressure adjustment valve 11, or cancels the maintenance of this open state. For example, when the unloaders 2e and 2f maintain both the intake valves 2a and 2b in the open state, the compressor body 2 operates in a no-load state in which the load of the drive unit 4 is reduced as much as possible (no-load operation). I do. On the other hand, when the unloaders 2e and 2f do not maintain both the intake valves 2a and 2b due to the release of the above-described open state, the compressor body 2 has a normal (for example, 100%) load on the drive unit 4. Operate under load (load operation).

  During the load operation, the compressor body 2 pressurizes and compresses the received actual gas G1, and sequentially sends the compressed gas of the actual gas G1 to the intercooler 5 through a pipe. The actual gas G1 is a coke oven gas or nitrogen gas containing carbon monoxide or the like, and is obtained, for example, during actual operation of factory equipment.

  The intercooler 5 is a device that cools the compressed gas to a preset temperature. Specifically, the intercooler 5 is connected to one compressor body 2 and the other compressor body 3 through piping. The intercooler 5 receives the compressed actual gas G1 from one compressor body 2 through a pipe, and cools the received compressed gas of the actual gas G1 while circulating the compressed gas to the other compressor body 3 side. The intercooler 5 cools the compressed gas of the actual gas G1 to a temperature suitable for the compression process by the compressor body 3, and then sends the cooled compressed gas to the compressor body 3 through a pipe.

  The compressor body 3 is a high-pressure side compressor that performs the second-stage compression process on the above-described real gas G1. Specifically, the compressor main body 3 has a gas compression mechanism that compresses the gas in the compression chamber by the action of a piston that reciprocates in the cylinder, in substantially the same manner as the compressor main body 2 described above. Gas inlet valves 3a and 3b are provided on the inlet side (upper side) of the gas compression mechanism of the compressor body 3, and discharge valves 3c and 3d are provided on the outlet side (lower side) of the gas compression mechanism. It is done. The compressor body 3 receives the compressed gas of the actual gas G1 from the intercooler 5 through a pipe. The compressor main body 3 sucks the received compressed gas into the compression chamber from the suction valves 3a and 3b while operating the gas compression mechanism using the drive unit 4 such as a motor as a drive source. The compressed gas in the compression chamber is further pressurized to a predetermined pressure and compressed. The compressed gas G2 thus generated is normally discharged from the compression chamber to the outlet side of the compressor body 3 through the discharge valves 3c and 3d.

  The compressor body 3 has unloaders 3e and 3f on the suction valves 3a and 3b side. Based on the control of the pressure regulating valve 11, the unloader 3e maintains the open state of the intake valve 3a on the inner side (drive unit 4 side) or cancels the maintenance of the open state. Similarly, the unloader 3f maintains the open state of the outer intake valve 3b based on the control of the pressure adjustment valve 11, or cancels the maintenance of this open state. For example, when the unloaders 3e and 3f maintain both the intake valves 3a and 3b in the open state, the compressor body 3 performs no-load operation. On the other hand, when the unloaders 3e and 3f do not maintain both the intake valves 3a and 3b due to the release of the open state described above, the compressor body 3 performs a load operation.

  During the load operation, the compressor body 3 further pressurizes and compresses the received compressed gas of the actual gas G1, and sequentially sends the compressed gas G2 generated thereby to the aftercooler 6 through the pipe 8b. The compressed gas G2 is a high-pressure compressed gas obtained by further compressing the actual gas G1 after being compressed by the compressor body 2 by the compressor body 3. This compressed gas G2 has a pressure within a pressure range required in accordance with factory use (use of gas pressure equipment).

  The aftercooler 6 is a device that cools the compressed gas to a preset temperature. Specifically, the aftercooler 6 is connected to the outlet side (lower side) of the compressor body 3 through the pipe 8b and connected to the inlet side of the receiver tank 7 through the pipe 8c. The aftercooler 6 receives the compressed gas G2 from the compressor body 3 through the pipe 8b, and cools the received compressed gas G2 while circulating it to the receiver tank 7 side. The aftercooler 6 cools the compressed gas G2 to a temperature suitable for actual use of the compressed gas (for example, use of gas pressure equipment), and then sends the cooled compressed gas G2 to the receiver tank 7 through the pipe 8c.

  The receiver tank 7 functions as a discharge-side pressure tank that stores and discharges the compressed gas G2 from the reciprocating compressor 1. Specifically, as shown in FIG. 1, the receiver tank 7 includes a pipe 8 c that leads to the above-described after-cooler 6, a pipe 8 d that leads to the outside of the reciprocating compressor 1 (such as a factory), and a pressure adjustment valve 11. And a pipe 10a leading to. The receiver tank 7 sequentially receives the compressed gas G2 from the aftercooler 6 through the pipe 8c, and temporarily stores the received compressed gas G2. Thereafter, the receiver tank 7 supplies the compressed gas G2 to the pressure regulating valve 11 through the pipe 10a. In parallel with this, the receiver tank 7 appropriately supplies the compressed gas G2 to the outside of the reciprocating compressor 1 through the pipe 8d as a power source in the factory (for example, a power source of gas pressure equipment).

  The pressure adjustment valve 11 functions as a load control valve that controls the load of the reciprocating compressor 1. Specifically, as shown in FIG. 1, the pressure regulating valve 11 includes a pipe 10a that communicates with the receiver tank 7 and a pipe 10b that communicates with the unloaders 2e, 2f, 3e, and 3f of the compressor bodies 2 and 3. And a pipe 10c for exhaust. An electromagnetic valve 9c is provided at the output end of the pipe 10c. The pressure regulating valve 11 receives the compressed gas G2 from the receiver tank 7 through the pipe 10a, and performs a valve opening / closing operation according to the pressure of the received compressed gas G2. For example, when the pressure of the compressed gas G2 is larger than a predetermined pressure setting value set in advance, the pressure regulating valve 11 performs valve opening operation and performs unloading on the unloaders 2e, 2f, 3e, and 3f through the pipe 10b. Compressed gas G2 is sent out. The pressure regulating valve 11 appropriately operates the unloaders 2e, 2f, 3e, 3f by the pressure of the compressed gas G2, thereby maintaining the intake valves 2a, 2b, 3a, 3b of the compressor bodies 2, 3 in the open state. To do. As a result, the pressure regulating valve 11 moderately reduces the load applied to the drive unit 4 and switches the operation mode of the compressor main bodies 2 and 3 to no-load operation (0% load operation). On the other hand, the pressure regulating valve 11 performs a valve closing operation when the pressure of the compressed gas G2 is equal to or lower than a predetermined pressure set value. In this case, the pressure regulating valve 11 stops the supply of the compressed gas G2 to the unloaders 2e, 2f, 3e, 3f, and electromagnetically transmits the compressed gas G2 as a power source of the unloaders 2e, 2f, 3e, 3f through the pipe 10c. Exhaust from the valve 9c. Thereby, the pressure regulating valve 11 makes the suction valves 2a, 2b, 3a, 3b of the compressor bodies 2, 3 free without being kept open. As a result, the pressure regulating valve 11 controls the load applied to the drive unit 4 to a normal load and switches the operation mode of the compressor main bodies 2 and 3 to load operation (for example, 100% load operation).

  As described above, the pressure regulating valve 11 is a load applied to the drive unit 4 of the compressor main bodies 2 and 3 according to the pressure of the compressed gas G2 in the receiver tank 7, that is, the pressure on the discharge side in the reciprocating compressor 1. To control. The pressure regulating valve 11 switches the operation mode of the compressor main bodies 2 and 3 to load operation or no-load operation through this load control. Alternatively, the pressure adjustment valve 11 switches the operation mode of the compressor main bodies 2 and 3 to the stopped state according to the pressure on the discharge side in the reciprocating compressor 1.

  On the other hand, in the reciprocating compressor 1 shown in FIG. 1, the inlet side valve 9a provided in the inlet side pipe 8a and the outlet side valve 9b provided in the outlet side pipe 8c are used for maintenance of the reciprocating compressor 1, etc. This valve is closed when performing maintenance work. That is, regardless of the operation mode (such as no-load operation or load operation) of the reciprocating compressor 1, the inlet side valve 9a and the outlet side valve 9b are always open during the operation period of the reciprocating compressor 1.

  In addition, although the reciprocating compressor 1 mentioned above was provided with the two compressor main bodies 2 and 3 and the one pressure regulating valve 11 as shown in FIG. 1, the number of compressor main bodies and the number of pressure regulating valves are as follows. The number is not particularly limited to the above, and may be one or plural. Similarly, the number of intake valves and the number of discharge valves of the compressor bodies 2 and 3 are not particularly limited to two, and may be one or three or more. That is, in the present invention, the number of compressor bodies, the number of pressure adjusting valves, the number of intake valves, and the number of discharge valves are not particularly limited. For example, it is also possible to attach a plurality of pressure regulating valves having the same configuration as the pressure regulating valve 11 described above to the reciprocating compressor 1 and switch the operation mode of the reciprocating compressor using the plurality of pressure regulating valves. Specifically, among the plurality of pressure regulating valves, one pressure regulating valve and the inner unloaders 2e and 3e are connected by piping, and the other pressure regulating valve and the outer unloaders 2f and 3f are connected by piping. In this configuration, according to the pressure of the compressed gas G2 supplied from the receiver tank 7, the plurality of pressure regulating valves send the compressed gas G2 to at least one of the unloaders 2e, 2f, 3e, 3f. The unloaders 2e, 2f, 3e, and 3f are appropriately operated by the pressure of the compressed gas G2, and as a result, at least one of the suction valves 2a, 2b, 3a, and 3b is kept open. Due to the action of such an unloader, the plurality of pressure regulating valves switches the operation mode of the compressor bodies 2 and 3 to no-load operation or partial load operation. The partial load operation is an operation in a partial load state in which a low load is applied to the drive unit 4 as compared with the normal time. For example, half (two) of the intake valves 2a, 2b, 3a, 3b are opened. The load applied to the drive unit 4 is reduced to about 50% of the normal time, and a 50% load operation is performed.

(Pressure adjustment valve)
Next, the pressure regulating valve 11 to be maintained in the embodiment of the present invention will be described. FIG. 2 is a schematic cross-sectional view showing a configuration example of the pressure regulating valve to be maintained in the embodiment of the present invention.

  As shown in FIG. 2, the pressure regulating valve 11 to be serviced in the present embodiment is formed with an inlet portion 12 in which an opening portion is formed, an upper cylindrical body 13 in which a circulation port 13 a is formed, and a discharge port 14 a. The lower cylinder body 14 is provided. The pressure adjustment valve 11 includes a valve body 15, a strainer 15a, a pressure width adjustment unit 16, an operating pressure adjustment unit 17, an O-ring 18a, seal members 18b and 18c, and nuts 19a and 19b. .

  The inlet 12 is a member that forms the upper end of the casing of the pressure regulating valve 11, and is formed with an opening that allows inflow of gas. For example, as shown in FIG. 2, a pipe 10 a (see FIG. 1) leading to the receiver tank 7 is attached to the opening of the inlet portion 12 by fastening or the like. The inlet portion 12 is screwed to the upper cylindrical body 13, thereby forming a gas inflow path into the pressure regulating valve 11.

  The upper cylindrical body 13 is a cylindrical member that forms the upper side of the casing of the pressure regulating valve 11. The upper cylinder 13 has a circulation port 13a for flowing out or inflowing gas at a predetermined position on the side thereof. For example, as shown in FIG. 2, a pipe 10b (see FIG. 1) leading to the unloaders 2e, 2f, 3e, 3f is attached to the circulation port 13a by fastening or the like.

  The lower cylindrical body 14 is a cylindrical member that forms the lower side of the casing of the pressure regulating valve 11. The lower cylinder 14 has a discharge port 14a for discharging gas or the like at a predetermined position on its side. For example, as shown in FIG. 2, a pipe 10c that leads to the outside of the above-described reciprocating compressor 1 is attached to the discharge port 14a by fastening or the like. The lower cylinder 14 is pressed and connected to the lower end of the upper cylinder 13 through the seal member 18b.

  The valve body 15 is a member (for example, a box-shaped member) for opening and closing the pressure regulating valve 11. As shown in FIG. 2, the valve body 15 is slidably disposed inside the upper cylinder 13. A strainer 15 a is arranged between the valve body 15 and the inlet portion 12. The strainer 15a prevents foreign substances such as dust from entering the inner side of the upper cylinder 13 from the inlet 12 side. The valve body 15 moves in the upper cylinder 13 in a direction approaching the strainer 15a or a direction away from the strainer 15a (that is, a direction approaching the upper end portion of the pressure width adjusting unit 16). The valve body 15 closes the lower opening end by contacting the lower opening end of the strainer 15a. As a result, the valve body 15 blocks the flow path between the opening portion of the inlet portion 12 and the flow port 13a of the upper cylindrical body 13, and between the flow port 13a and the discharge port 14a of the lower cylindrical body 14. Open distribution channels. On the other hand, the valve body 15 closes the upper end portion of the pressure width adjusting portion 16 by being separated from the strainer 15 a and contacting the upper end portion of the pressure width adjusting portion 16. As a result, the valve body 15 opens the flow path between the opening portion of the inlet portion 12 and the flow port 13a of the upper cylindrical body 13, and between the flow port 13a and the discharge port 14a of the lower cylindrical body 14. Block distribution channels.

  The pressure width adjusting unit 16 adjusts the width of the pressure (operating pressure) required for the opening / closing operation of the pressure adjusting valve 11, that is, the difference between the upper limit value and the lower limit value of the operating pressure (hereinafter referred to as the operating pressure width). It is a member. Specifically, as shown in FIG. 2, the pressure width adjustment unit 16 is a cylindrical member that can be accommodated in the upper cylindrical body 13 and the lower cylindrical body 14, and passes through the lower cylindrical body 14. And is screwed into the upper cylindrical body 13. At that time, the upper end portion of the pressure width adjusting portion 16 is arranged in a range from the lower side to the upper side compared to the outlet port 14 a of the lower cylindrical body 14 as compared to the flow port 13 a of the upper cylindrical body 13. . The pressure width adjusting unit 16 adjusts the lift amount of the valve body 15 by adjusting the screwing amount into the upper cylindrical body 13. The pressure width adjusting unit 16 adjusts the operating pressure width of the pressure adjusting valve 11 by adjusting the lift amount of the valve body 15. The lift amount of the valve body 15 is the difference between the distance from the lower end portion of the strainer 15a to the upper end portion of the pressure width adjusting portion 16 and the length of the valve body 15 in the reciprocating movement direction (longitudinal direction of the pressure adjusting valve 11). is there. That is, the valve body 15 can reciprocate within the upper cylinder 13 by the lift amount.

  The operating pressure adjusting unit 17 is a member for adjusting the operating pressure of the pressure adjusting valve 11. Specifically, as shown in FIG. 2, the operating pressure adjustment unit 17 includes a valve body support shaft 17a, a spring 17b, and a bearing portion 17c. The valve body support shaft 17 a has a flange-shaped upper end portion (for example, a conical bulging portion) that is wide in a direction perpendicular to the longitudinal direction thereof, passes through the inside of the pressure width adjustment portion 16, and is connected to the upper cylinder body 13. Placed inside. The upper end of the valve body support shaft 17a is inserted into the valve body 15 to support the valve body 15 from the inside. The spring 17b is inserted through the shaft portion of the valve body support shaft 17a. The bearing portion 17c is screwed into the pressure width adjusting portion 16, and receives and supports the valve body support shaft 17a from the lower end side thereof. In this state, one end (upper end) of the spring 17b is in contact with the upper end portion of the valve body support shaft 17a, and the other end (lower end) of the spring 17b is in contact with the upper end portion of the bearing portion 17c. The valve body support shaft 17a presses the valve body 15 in a direction approaching the strainer 15a side by the biasing force of the spring 17b in such a state. The operating pressure adjusting portion 17 having the above-described configuration adjusts the screwing amount of the bearing portion 17c with respect to the pressure width adjusting portion 16 disposed inside the upper cylindrical body 13 and the lower cylindrical body 14 to thereby adjust the valve body support shaft. The biasing force of the spring 17b acting on 17a is adjusted. The operating pressure adjusting unit 17 adjusts the pressing force of the valve body 15 against the strainer 15a, that is, the operating pressure of the pressure adjusting valve 11 (specifically, the upper and lower limit values of the operating pressure) by adjusting the urging force of the spring 17b. To do.

  The O-ring 18a is a seal member for ensuring airtightness between the pressure width adjusting unit 16 and the operating pressure adjusting unit 17 described above. Specifically, as shown in FIG. 2, the O-ring 18 a is fixedly disposed on the side wall at the lower end portion of the bearing portion 17 c of the operating pressure adjusting portion 17, and the outer wall of the bearing portion 17 c and the inner wall of the pressure width adjusting portion 16 are To close the gap. Thus, the O-ring 18a prevents gas leakage from between the pressure width adjusting unit 16 and the operating pressure adjusting unit 17.

  As shown in FIG. 2, the sealing member 18 b is disposed along the outer wall of the pressure width adjusting unit 16 so as to be interposed between the lower end portion of the upper cylindrical body 13 and the upper end portion of the lower cylindrical body 14. As the nut 19 a is tightened, the seal member 18 b is pressed more strongly by the lower end portion of the upper cylinder 13 and the upper end portion of the lower cylinder 14. As a result, the sealing member 18b ensures airtightness between the lower end of the upper cylindrical body 13 and the upper end of the lower cylindrical body 14 (the joint between the upper cylindrical body 13 and the lower cylindrical body 14), Gas leakage from this part is prevented.

  As shown in FIG. 2, the seal member 18 c is disposed along the outer wall of the pressure width adjusting unit 16 so as to be interposed between the lower end portion of the lower cylindrical body 14 and the outer wall of the pressure width adjusting unit 16. The seal member 18c is pressed more strongly between the lower end portion of the lower cylindrical body 14 and the outer wall of the pressure width adjusting portion 16 as the nut 19a is tightened. As a result, the sealing member 18c ensures airtightness between the lower end portion of the lower cylindrical body 14 and the outer wall of the pressure width adjusting portion 16, and prevents gas leakage from this portion.

  As shown in FIG. 2, the nut 19 a is firmly fastened to the outer wall of the pressure width adjustment unit 16 to lock the connection between the upper cylinder 13, the lower cylinder 14, and the pressure width adjustment unit 16. Moreover, the nut 19a press-connects the lower cylinder 14 to the upper cylinder 13 through the seal members 18b and 18c by the firm fastening, and as a result, as described above, the upper cylinder by the seal members 18b and 18c. Airtightness between the body 13, the lower cylindrical body 14, and the outer wall of the pressure width adjusting unit 16 is ensured. On the other hand, as shown in FIG. 2, the nut 19 b is firmly fastened to the outer wall of the lower end portion of the operating pressure adjusting unit 17, thereby locking the connection between the pressure width adjusting unit 16 and the operating pressure adjusting unit 17.

  Next, the opening / closing operation of the pressure regulating valve 11 will be described. FIG. 3 is a view for explaining the opening / closing operation of the pressure regulating valve to be maintained in the present embodiment. The pressure regulating valve 11 opens and closes according to the pressure of the compressed gas G2 in the receiver tank 7 shown in FIG. 1 (pressure on the discharge side of the reciprocating compressor 1), and controls the load of the reciprocating compressor 1. Specifically, the pressure regulating valve 11 receives the compressed gas G2 from the receiver tank 7 through the pipe 10a attached to the inlet portion 12. The compressed gas G2 reaches the upper end surface of the valve body 15 from the inlet 12 through the strainer 15a. The valve body 15 is pressed against the strainer 15a by the pressing force of the valve body support shaft 17a (the urging force of the spring 17b) to close the opening of the strainer 15a.

  When the pressure of the compressed gas G2 exceeds the pressure setting value on the discharge side in the reciprocating compressor 1, the pressing force of the valve body 15 that closes the strainer 15a is smaller than the pressure of the compressed gas G2. That is, the operating pressure of the pressure regulating valve 11 is smaller than that of the compressed gas G2. In this case, as shown in FIG. 3, the compressed gas G2 separates the valve body 15 from the strainer 15a against the urging force of the spring 17b, and thereby the strainer 15a is separated from the strainer 15a via the internal space of the upper cylindrical body 13. The communication port 13a is brought into a communication state. The compressed gas G <b> 2 continues to flow into the inner space of the upper cylinder 13 while pushing and moving the valve body 15 toward the upper end of the pressure width adjusting unit 16. Thereafter, the compressed gas G <b> 2 presses the valve body 15 against the upper end of the pressure width adjusting unit 16 to close the opening of the pressure width adjusting unit 16, and thereby flows through the internal space of the pressure width adjusting unit 16. The flow path between the mouth 13a and the outlet 14a is blocked. In parallel with this, the compressed gas G2 is supplied from the circulation port 13a to the unloader of the reciprocating compressor 1 (at least one of the unloaders 2e, 2f, 3e, and 3f shown in FIG. 1) through the pipe 10b. As a result, the pressure regulating valve 11 controls the load of the reciprocating compressor 1 (specifically, the compressor main bodies 2 and 3 shown in FIG. 1) by the action of the unloader supplied with the compressed gas G2. The operation mode is switched to no-load operation or partial load operation.

  As described above, the open / close state of the pressure regulating valve 11 that switches the operation mode of the reciprocating compressor 1 to the no-load operation or the partial load operation is defined as an unload state (see FIG. 3). In the pressure regulating valve 11 in the unloaded state, the valve body 5 moves in a direction away from the strainer 15a, whereby the inlet portion 12 and the flow port 13a are connected to each other through the internal space of the strainer 15a and the upper cylindrical body 13. Communicate. Further, the valve body 5 moves in a direction approaching the upper end portion of the pressure width adjusting portion 16 to close the opening of the pressure width adjusting portion 16, thereby passing through the internal space of the pressure width adjusting portion 16. The communication between the circulation port 13a and the discharge port 14a is blocked.

  On the other hand, when the pressure of the compressed gas G2 is equal to or lower than the pressure set value on the discharge side in the reciprocating compressor 1, the pressing force of the valve body 15 that closes the strainer 15a is equal to or higher than the pressure of the compressed gas G2. That is, the operating pressure of the pressure regulating valve 11 is equal to or higher than the compressed gas G2. In this case, the compressed gas G2 from the inlet portion 12 cannot push down the valve body 15 to which the urging force of the spring 17b acts. As a result, the valve body 15 closes the strainer 15a as shown in FIG. To do. Thereby, the communication between the strainer 15a and the circulation port 13a through the internal space of the upper cylinder 13 is blocked. In parallel with this, the valve body 15 is separated from the upper end portion of the pressure width adjusting portion 16 to release the blockage of the opening portion of the pressure width adjusting portion 16. Thereby, the circulation port 13a and the discharge port 14a are in communication with each other through the internal space of the pressure width adjusting unit 16. In this state, the pressure regulating valve 11 collects the compressed gas G2 from the unloader in the operating state (at least one of the unloaders 2e, 2f, 3e, and 3f shown in FIG. 1) through the pipe 10b. As shown in FIG. 3, the compressed gas G <b> 2 from the unloader passes from the circulation port 13 a to the discharge port 14 a through the internal spaces of the upper cylinder 13 and the pressure width adjusting unit 16. A pipe 10c is connected to the discharge port 14a. The pressure regulating valve 11 discharges the compressed gas G2 from the unloader to the outside of the pressure regulating valve 11 from the discharge port 14a through the pipe 10c. As a result, the pressure regulating valve 11 cancels the unloader operation and controls the load of the reciprocating compressor 1, thereby switching the operation mode of the reciprocating compressor 1 to load operation.

  As described above, the open / close state of the pressure regulating valve 11 that switches the operation mode of the reciprocating compressor 1 to the load operation is defined as an unload release state (see FIG. 3). In the pressure regulating valve 11 in the unloaded release state, the valve body 5 moves in a direction approaching the strainer 15a, whereby the inlet portion 12 and the flow port 13a through the internal space of the strainer 15a and the upper cylindrical body 13 Block the distribution channel. Further, the valve body 5 moves in a direction away from the upper end portion of the pressure width adjusting portion 16 to open the opening of the pressure width adjusting portion 16, thereby allowing the pressure width adjusting portion 16 to pass through the internal space. The circulation port 13a and the discharge port 14a are connected.

(Valve maintenance equipment)
Next, the valve maintenance facility according to the embodiment of the present invention will be described. FIG. 4 is a diagram illustrating a configuration example of the valve maintenance facility according to the embodiment of the present invention. As shown in FIG. 4, the valve maintenance facility 21 according to the present embodiment is a facility used for maintenance of the load control valve (pressure regulating valve 11) of the above-described reciprocating compressor 1, and stores and discharges compressed air. The pressure tank 22, the pressure gauge 23 of the pressure tank 22, the unload pressure gauge 24, and the inlet valve 25a and the air vent valve 25b for adjusting the supply pressure of compressed air are provided. Moreover, as shown in FIG. 4, the valve maintenance equipment 21 is provided with pipes 26a to 26c, 27a to 27d, 28a, and 28b at necessary places. The valve maintenance equipment 21 includes the first air source valve 29a, the second air source valve 29b, the blow valves 29c, 29g, 29h, 29i, the communication valves 29d, 29e, and the safety valve 29f. And a cleaning liquid valve 29j. Further, the valve maintenance facility 21 includes a fixing portion 30 for fixing the load control valve to be maintained to the pipe.

  The pressure tank 22 is a pressure vessel that supplies compressed air to the pressure regulating valve 11 in order to maintain the pressure regulating valve 11. Specifically, the pressure tank 22 is connected to the pressure regulating valve 11 removed from the reciprocating compressor 1 through the pipe 27a. The pipe 27 a is, for example, a U-shaped or U-shaped folded pipe, and one end is connected to the pressure tank 22 and the other end is connected to the opening of the inlet portion 12 of the pressure regulating valve 11. As shown in FIG. 4, a communication valve 29d is provided in the pipe 27a. The communication valve 29d is always open during the period of maintenance of the pressure adjustment valve 11, specifically, the period of supplying the compressed air G7 to the pressure adjustment valve 11, and the pressure tank 22 and the pressure adjustment valve 11 are connected via the pipe 27a. And the communication state. The communication valve 29d is closed as necessary, for example, after the maintenance of the pressure regulating valve 11 is completed. The pressure tank 22 simulates the receiver tank 7 (see FIG. 1) that stores and discharges the compressed gas G2 from the reciprocating compressor 1, and supplies the compressed air G7 to the pressure regulating valve 11. That is, the pressure tank 22 supplies the compressed air G7 from the inlet 12 to the inside of the pressure regulating valve 11 through the pipe 27a.

  The pressure tank 22 is preferably a pressure vessel that can withstand a pressure equal to or higher than the upper limit pressure of the compressed gas G2 in the equipment specifications of the reciprocating compressor 1 such as the upper limit pressure of the receiver tank 7. The capacity of the pressure tank 22 is preferably about the same as that of the receiver tank 7.

  The pressure gauge 23 displays the supply pressure of the compressed air G7 to the pressure regulating valve 11. Specifically, the pressure gauge 23 is connected to the pressure tank 22 through the pipe 27b. A communication valve 29e is provided in the pipe 27b. The communication valve 29e is always in an open state during maintenance of the pressure regulating valve 11, and is closed as necessary after completion of maintenance of the pressure regulating valve 11. The pressure gauge 23 measures the pressure of the compressed air G7 flowing from the pressure tank 22 through the pipe 27b, and displays the measured pressure as the supply pressure of the compressed air G7 from the pressure tank 22 to the pressure regulating valve 11. In addition, the pressure gauge 23 supplies the measured supply pressure of the compressed air G7 during the period when the unload pressure gauge 24 described later indicates that the pressure adjustment valve 11 is in the unload state. Display as working pressure. Such a pressure gauge 23 is desirably arranged side by side with the unload pressure gauge 24 as shown in FIG. This is because it becomes easier for the operator to confirm the display content of the pressure gauge 23 and the display content of the unload pressure gauge 24 at the same time.

  The unload pressure gauge 24 has a function as a display meter for displaying that the pressure regulating valve 11 is operated in an unload state in which the reciprocating compressor 1 can be controlled to a no-load state according to the supply pressure of the compressed air G7. Have. Specifically, the unload pressure gauge 24 is connected to the pressure regulating valve 11 through the pipe 28a. As shown in FIG. 4, the pipe 28 a has one end connected to the flow port 13 a of the pressure regulating valve 11 and the other end connected to the unload pressure gauge 24. A blow valve 29h is provided near one end of the pipe 28a. The blow valve 29h is always open during maintenance of the pressure regulating valve 11, and is closed as necessary after the maintenance of the pressure regulating valve 11 is completed. When the pressure adjustment valve 11 is in the unload state (see FIG. 3), the unload pressure gauge 24 uses the pressure of the compressed air G7 flowing from the pressure adjustment valve 11 through the pipe 28a to the pressure adjustment valve 11 required for the unload state. Measured as the working pressure and displays the measured working pressure. The unload pressure gauge 24 indicates that the pressure regulating valve 11 has been activated in the unloaded state by displaying this operating pressure. In this case, the pressure gauge 23 described above displays the supply pressure of the compressed air G7 that is equivalent to the operating pressure of the pressure regulating valve 11 displayed by the unload pressure gauge 24. On the other hand, when the pressure adjustment valve 11 is not in the unload state, the unload pressure gauge 24 does not display that the pressure adjustment valve 11 is in the unload state. In this case, the unload pressure gauge 24 displays a pressure measurement result (for example, a pressure value “0”) different from the pressure gauge 23 described above.

  The inlet valve 25a and the air vent valve 25b constitute pressure adjusting means for adjusting the supply pressure of the compressed air G7 to the pressure adjusting valve 11 to operate the pressure adjusting valve 11. Specifically, as shown in FIG. 4, the inlet valve 25 a is provided in a pipe 26 a for allowing the compressed air G <b> 7 to flow into the pressure tank 22. One end of the pipe 26 a is connected to a compressor (not shown) in the factory, and the other end is connected to the inlet of the pressure tank 22. A blow valve 29c is provided in the branch pipe of the pipe 26a. The blow valve 29c is always in an open state during maintenance of the pressure regulating valve 11, and is closed as necessary after completion of maintenance of the pressure regulating valve 11. Further, the pipe 26a is provided with a first air source valve 29a at a location upstream of the inlet valve 25a, and another pipe 26b is provided at a position between the first air source valve 29a and the inlet valve 25a. Join. The pipe 26b is provided with a second air source valve 29b and an air cylinder 31. Such a pipe 26 a circulates the compressed air G <b> 5 from the compressor in the factory toward the pressure tank 22. In the middle of this, the pipe 26a merges the compressed air G6 ejected from the air cylinder 31 through the pipe 26b and the compressed air G5 from the factory, thereby obtaining high-pressure compressed air G7. The compressed air G7 is compressed air in which the pressure of the compressed air G5 is increased by the compressed air G6. The inlet valve 25a adjusts the inflow amount of the compressed air G7 to the pressure tank 22, and adjusts the increase in the supply pressure of the compressed air G7 to the pressure adjusting valve 11 through the adjustment of the inflow amount.

  On the other hand, as shown in FIG. 4, the air vent valve 25 b is provided in a pipe 26 c for extracting a part of the compressed air G 7 from the pipe 26 a that flows the compressed air G 7 into the pressure tank 22 and exhausting it. The pipe 26c branches from the pipe 26a at a position between the inlet valve 25a and the pressure tank 22, and communicates with the outside of the valve maintenance facility 21 (for example, in the atmosphere). Further, a pipe 27d communicating with the pressure tank 22 is connected to the pipe 26c, and a blow valve 29g is provided in the pipe 27d. The blow valve 29g is always in an open state during maintenance of the pressure regulating valve 11, and is closed as necessary after completion of maintenance of the pressure regulating valve 11. As shown in FIG. 4, the air vent valve 25b is provided in the vicinity of a branch portion of the pipes 26a and 26c in the pipe 26c. The air vent valve 25b adjusts to reduce the inflow amount of the compressed air G7 to the pressure tank 22, and adjusts the decrease in the supply pressure of the compressed air G7 to the pressure adjustment valve 11 through the adjustment of the inflow reduction amount. Note that the air vent valve 25b is preferably disposed in the vicinity of the inlet valve 25a. This is because by arranging the inlet valve 25a and the air vent valve 25b in the vicinity of each other, it is easy to adjust the increase or decrease in the supply pressure of the compressed air G7 to the pressure regulating valve 11.

  Here, the inlet valve 25a and the air vent valve 25b described above are configured using needle valves. Thereby, the inlet valve 25a and the air vent valve 25b can easily finely adjust the inflow amount of the compressed air G7 to the pressure tank 22, and supply of the compressed air G7 to the pressure adjusting valve 11 through the fine adjustment of the inflow amount. The pressure can be easily fine-tuned. In the present embodiment, the fine adjustment of the supply pressure of the compressed air G7 is to adjust up to 1/10 of the minimum digit of the operating pressure required for the pressure regulating valve 11 to be maintained. For example, when a pressure value (for example, 7.5 [MPa]) in which the first decimal place is the minimum digit is required as the operating pressure of the pressure regulating valve 11, the supply pressure of the compressed air G7 is adjusted to the second decimal place. This is a fine adjustment of the pressure value. The valves constituting the inlet valve 25a and the air vent valve 25b may be valves other than a needle valve such as a ball valve. However, from the viewpoint of ease of fine adjustment of the pressure value described above, a needle valve may be used. It is desirable to be.

  Note that the first air source valve 29a provided in the pipe 26a is always opened during the maintenance of the pressure regulating valve 11 so that the compressed air G5 and G7 can be supplied to the pressure tank 22. The second air source valve 29b provided in the pipe 26b is always open during the period during which the compressed air G6 from the air cylinder 31 is supplied. The first air source valve 29a and the second air source valve 29b are closed as necessary, for example, after the maintenance of the pressure adjustment valve 11 is completed.

  The safety valve 29f is for preventing the pressure of the compressed air G7 flowing into the pressure tank 22 from increasing excessively. Specifically, the safety valve 29f is connected to the pressure tank 22 through the pipe 27c. The safety valve 29f is in a closed state when the pressure of the compressed air G7 in the pressure tank 22 is less than the upper limit pressure of the pressure tank 22. On the other hand, when the pressure of the compressed air G7 reaches the upper limit pressure of the pressure tank 22, the safety valve 29f is opened, and the compressed air G7 in the pressure tank 22 is exhausted from the pipe 27c to the outside. The compressed air G7 in the pressure tank 22 is depressurized. In this way, the safety valve 29f prevents the pressure of the compressed air G7 in the pressure tank 22 from exceeding the upper limit pressure of the pressure tank 22.

  On the other hand, as shown in FIG. 4, a pipe 28b is connected to the outlet 14a of the pressure regulating valve 11 to be serviced. The pipe 28b has an orifice portion 28c in the vicinity of the outlet end thereof. A blow valve 29i is provided at the outlet end of the pipe 28b. The piping 28b discharges the compressed air G7 from the inside of the pressure regulating valve 11 to the outside (in the atmosphere) when the pressure regulating valve 11 is in the unload release state (see FIG. 3). At that time, the orifice portion 28c limits the discharge amount of the compressed air G7 so that the compressed air G7 is discharged from the pressure adjusting valve 11 to the outside through the pipe 28b. The blow valve 29i is always in an open state during maintenance of the pressure regulating valve 11, and is closed as necessary after completion of maintenance of the pressure regulating valve 11.

  The cleaning liquid valve 29j is a valve used when appropriately cleaning the inside of the pressure regulating valve 11. Specifically, as shown in FIG. 4, the cleaning liquid valve 29 j is provided in a pipe 27 e that communicates with the pressure regulating valve 11 so as to be opened and closed. The pipe 27 e is a pipe branched from a pipe 27 a that communicates the pressure tank 22 and the pressure adjustment valve 11, and communicates linearly with the opening of the inlet portion 12 of the pressure adjustment valve 11. The cleaning liquid valve 29j is allowed to inject the cleaning liquid into the pressure regulating valve 11 when being opened. The cleaning liquid valve 29j is in an open state during the cleaning period of the pressure regulating valve 11, and is in a closed state during other periods.

  The fixing part 30 is a member for fixing the pressure regulating valve 11 to the pipe 27a. Specifically, as shown in FIG. 4, one end of the fixing portion 30 is attached to the outer wall of the pressure regulating valve 11, and the other end is attached to a portion of the pipe 27 a that is arranged in parallel with the pressure regulating valve 11. . The fixing unit 30 fixes the pressure regulating valve 11 and the pipe 27a in parallel to each other, thereby preventing a situation where the pressure regulating valve 11 is unintentionally detached from the pipe 27a when the pressure regulating valve 11 is serviced. Furthermore, the fixing part 30 prevents a situation in which the pipe 27a is bent by a rotational force generated during maintenance of the pressure regulation valve 11, and a situation in which the pressure regulation valve 11 is unintentionally swung.

(Valve maintenance method)
Next, a valve maintenance method according to an embodiment of the present invention will be described. FIG. 5 is a flowchart showing an example of the valve maintenance method according to the embodiment of the present invention. FIG. 6 is a diagram for explaining the adjustment of the operating pressure of the pressure regulating valve to be maintained in the present embodiment. The valve maintenance method according to the present embodiment will be described below with reference to FIGS. 4 to 6, illustrating the case where the pressure adjustment valve 11 is maintained using the valve maintenance facility 21 shown in FIG. 4.

  In the valve maintenance method according to the present embodiment, as shown in FIG. 5, first, the pressure regulating valve 11 to be serviced is removed from the reciprocating compressor 1 (see FIG. 1), and the removed pressure regulating valve 11 is serviced. It attaches to the equipment 21 (step S101). In step S101, as shown in FIG. 4, the pipe 27a leading to the pressure tank 22 is connected to the inlet 12 of the pressure regulating valve 11, and the pipe 28a leading to the unload pressure gauge 24 is connected to the flow port 13a of the pressure regulating valve 11. Connect to. Further, a pipe 28b communicating with the outside is connected to the discharge port 14a of the pressure regulating valve 11. Further, the pressure regulating valve 11 and the pipe 27 a are fixed by the fixing portion 30. In this way, the pressure regulating valve 11 is attached to the valve maintenance facility 21.

  In addition, before the pressure regulating valve 11 is attached to the valve maintenance facility 21, the inlet valve 25a, the air vent valve 25b, the first air source valve 29a, the second air source valve 29b, and the communication valves 29d and 29e of the valve maintenance facility 21 are provided. , And the cleaning liquid valve 29j are closed. On the other hand, the blow valves 29c, 29g, 29h, 29i of the valve maintenance facility 21 are open. In step S101, after the pressure regulating valve 11 is attached to the valve maintenance equipment 21 as described above, the communication valves 29d and 29e are opened, and the blow valves 29c, 29g, and 29h are closed.

  After step S101, compressed air is supplied to the pressure regulating valve 11 attached to the valve maintenance facility 21 as described above (step S102). In step S102, first, the first air source valve 29a and the second air source valve 29b are opened, and the compressed air G7 is circulated to the inlet valve 25a through the pipes 26a and 26b. Next, the inlet valve 25a is gradually opened, and the compressed air G7 flows into the pressure tank 22 through the pipe 26a. Subsequently, a receiver tank 7 (see FIG. 1) that stores and discharges the compressed gas G2 from the reciprocating compressor 1 is simulated from the pressure tank 22 to the pressure regulating valve 11 that is connected to the pressure tank 22 through the pipe 27a. Compressed air G7 is supplied. That is, the pressure tank 22 supplies the compressed air G7 from the inlet 12 of the pressure regulating valve 11 to the inside of the pressure regulating valve 11 through the pipe 27a.

  Subsequently, the supply pressure of the compressed air G7 supplied from the pressure tank 22 to the pressure adjustment valve 11 is adjusted (step S103). In step S103, the inflow amount of the compressed air G7 to the pressure tank 22 is adjusted appropriately using the inlet valve 25a such as a needle valve and the air vent valve 25b, and the compressed air G7 to the pressure adjusting valve 11 is adjusted through the adjustment of the inflow amount. Adjust the supply pressure. Specifically, by gradually increasing the opening degree of the inlet valve 25a, the increase in the inflow of the compressed air G7 to the pressure tank 22 is adjusted to adjust the increase in the supply pressure of the compressed air G7 to the pressure regulating valve 11. Further, if necessary, the amount of inflow of the compressed air G7 to the pressure tank 22 is adjusted by operating the opening degree of the air vent valve 25b. Thereby, the decrease in the supply pressure of the compressed air G7 to the pressure regulating valve 11 is adjusted. In this state, the pressure tank 22 continues to supply the pressure adjusting valve 11 with the compressed air G7 whose pressure has been adjusted by the inlet valve 25a and the air vent valve 25b. In parallel with this, the pressure gauge 23 of the pressure tank 22 displays the supply pressure of the compressed air G7 to the pressure regulating valve 11. While the supply pressure of the compressed air G7 is displayed on the pressure gauge 23, the supply pressure of the compressed air G7 is adjusted by the inlet valve 25a and the air vent valve 25b, thereby operating the pressure adjustment valve 11.

  At this time, the compressed air G7 continues to be supplied from the pressure tank 22 to the pressure regulating valve 11. When the supply pressure of the compressed air G7 is equal to or lower than the operating pressure of the pressure regulating valve 11, the pressure regulating valve 11 is Does not enter unload state. The unloaded state is a state of the pressure regulating valve 11 that can control the reciprocating compressor 1 to a no-load state, as shown in FIG. In this case, the unload pressure gauge 24 displays the pressure value “0” or the like and does not indicate that the pressure adjustment valve 11 is in the unload state.

  When the unload pressure gauge 24 does not indicate that the pressure regulating valve 11 is unloaded (No in step S104), the supply pressure of the compressed air G7 displayed on the pressure gauge 23 is confirmed, and this supply pressure is It is determined whether or not it has increased excessively compared to the predetermined value (step S105). When the supply pressure is not excessive as compared with the predetermined value (step S105, No), there is no particular problem in the process of supplying the compressed air G7 from the pressure tank 22 to the pressure regulating valve 11. For this reason, it returns to step S102 mentioned above and repeats the process step after this step S102.

  On the other hand, in step S105, when the supply pressure of the compressed air G7 is excessive as compared with the predetermined value (step S105, Yes), foreign matter such as oil adheres to the inside of the pressure adjustment valve 11, and the pressure adjustment valve 11 There is a possibility that it cannot operate normally. In this case, the cleaning liquid valve 29j provided in the pipe 27e leading to the pressure adjustment valve 11 is opened, and the cleaning liquid valve 29j is allowed to inject the cleaning liquid into the pressure adjustment valve 11. A cleaning liquid such as an organic solvent is injected from the cleaning liquid valve 29j into the pressure regulating valve 11 through the pipe 27e and the like. The inside of the pressure control valve 11 is cleaned with the sprayed cleaning liquid (step S106), and foreign matter in the pressure control valve 11 is removed. Thereafter, the cleaning liquid valve 29j is closed, the process returns to step S102 described above, and the processing steps after step S102 are repeated.

  On the other hand, when the supply pressure of the compressed air G7 from the pressure tank 22 to the pressure regulating valve 11 exceeds the operating pressure of the pressure regulating valve 11 in step S104 described above, the pressure regulating valve 11 is in the unload state shown in FIG. become. Thus, when the pressure regulating valve 11 is operated in the unloaded state according to the supply pressure of the compressed air G7, the unloaded pressure gauge 24 displays that the pressure regulating valve 11 is in the unloaded state (step S104, Yes). . In this case, the unload pressure gauge 24 measures and displays the operating pressure of the pressure regulating valve 11 required for the unloaded state.

  Subsequently, by comparing the pressure gauge 23 of the pressure tank 22 and the unload pressure gauge 24, the current supply pressure of the compressed air G 7 displayed on the pressure gauge 23 and the pressure displayed on the unload pressure gauge 24. It is determined whether or not the current operating pressure of the regulating valve 11 is equivalent (step S107).

  In step S107, when the supply pressure displayed on the pressure gauge 23 and the operation pressure displayed on the unload pressure gauge 24 are the same up to the minimum digit of the operation pressure required for the pressure regulating valve 11, these supply pressure and operation are performed. Pressure is defined as equivalent. For example, when the pressure adjusting valve 11 is requested to have an operating pressure with the first decimal place as the smallest digit, the supply pressure displayed on the pressure gauge 23 and the operating pressure displayed on the unload pressure gauge 24 are Even if the numerical values at the second place and below are different, they are equivalent if the numerical values from the most significant digit to the first decimal place are the same.

  When the supply pressure displayed on the pressure gauge 23 and the operating pressure displayed on the unload pressure gauge 24 are not equivalent (step S107, No), there is a possibility that a gas leak has occurred in the pressure adjustment valve 11. For this reason, the gas leakage of the pressure regulating valve 11 is inspected and repaired (step S108). In step S108, foaming test liquid such as soapy water is sprayed on the pressure regulating valve 11, and the gas leakage of the pressure regulating valve 11 is checked based on whether or not the test liquid is foamed. If a gas leak is found in the pressure regulating valve 11 as a result of the inspection, the degree of attachment of the pressure regulating valve 11 and the pipes 27a, 28a, 28b and the degree of fastening of the nuts 19a, 19b (see FIG. 6) of the pressure regulating valve 11 Adjust gas etc. to repair gas leak. Then, it returns to step S102 mentioned above and repeats the process step after this step S102.

  On the other hand, when the supply pressure displayed on the pressure gauge 23 and the operating pressure displayed on the unload pressure gauge 24 are equal (step S107, Yes), the operating pressure of the pressure regulating valve 11 is controlled by the pressure gauge 23 of the pressure tank 22. Is displayed (step S109). In step S <b> 109, the supply pressure of the compressed air G <b> 7 is displayed on the pressure gauge 23 as the operating pressure of the pressure adjustment valve 11 during a period in which the unload pressure gauge 24 indicates that the pressure adjustment valve 11 is unloaded. That is, when the pressure adjustment valve 11 is in the unload state, the pressure gauge 23 uses the supply pressure of the compressed air G7 equivalent to the operating pressure of the pressure adjustment valve 11 displayed by the unload pressure gauge 24 to the pressure adjustment valve 11. Display as working pressure. The operator thus sets the operating pressure displayed on the pressure gauge 23 (the supply pressure of the compressed air G7 equivalent to the operating pressure displayed on the unload pressure gauge 24) to the upper limit of the operating pressure of the pressure regulating valve 11 at the present time. Confirm as.

  Next, the supply pressure of the compressed air G7 from the pressure tank 22 to the pressure adjustment valve 11 is adjusted to confirm the lower limit of the operating pressure of the pressure adjustment valve 11 at the present time (step S110). In step S110, the inflow amount of the compressed air G7 to the pressure tank 22 is adjusted using the inlet valve 25a and the air vent valve 25b as appropriate, and the supply pressure of the compressed air G7 to the pressure adjustment valve 11 is adjusted through the adjustment of the inflow amount. adjust. Specifically, by adjusting the degree of inflow of the compressed air G7 to the pressure tank 22 by gradually increasing the opening degree of the air vent valve 25b, the supply pressure of the compressed air G7 to the pressure regulating valve 11 is decreased. Adjust. Further, if necessary, the inflow increase of the compressed air G7 to the pressure tank 22 is adjusted by manipulating the opening degree of the inlet valve 25a. Thereby, the increase in the supply pressure of the compressed air G7 to the pressure regulating valve 11 is adjusted. In this state, the pressure tank 22 continues to supply the pressure adjusting valve 11 with the compressed air G7 whose pressure is adjusted by the inlet valve 25a and the air vent valve 25b. In parallel with this, the unload pressure gauge 24 displays that the pressure regulating valve 11 is in the unloaded state, that is, the operating pressure of the pressure regulating valve 11 required for the unloaded state. The pressure gauge 23 of the pressure tank 22 displays the supply pressure of the compressed air G 7 as the operating pressure of the pressure regulating valve 11. In this way, while the operating pressure of the pressure adjusting valve 11 is displayed on the pressure gauge 23, the supply pressure of the compressed air G7 is adjusted by the inlet valve 25a and the air vent valve 25b, thereby operating the pressure adjusting valve 11.

  At this time, the compressed air G7 continues to be supplied from the pressure tank 22 to the pressure regulating valve 11, but when the supply pressure of the compressed air G7 exceeds the operating pressure of the pressure regulating valve 11, the pressure regulating valve The 11 unload state is not released. In this case, the pressure gauge 23 and the unload pressure gauge 24 display pressure values equivalent to each other. That is, the unload pressure gauge 24 has not finished displaying that the pressure regulating valve 11 is in the unloaded state.

  When the unload pressure gauge 24 has not finished displaying the unload state of the pressure regulating valve 11 (No at Step S111), the process returns to Step S110 described above, and the processing steps after Step S110 are repeated. That is, step S110 described above is repeated until the unload pressure gauge 24 finishes displaying the unload state of the pressure regulating valve 11.

  On the other hand, when the supply pressure of the compressed air G7 from the pressure tank 22 to the pressure adjustment valve 11 becomes equal to or lower than the operating pressure of the pressure adjustment valve 11, the pressure adjustment valve 11 releases the unload state and releases the unload state (see FIG. 3). Thus, when the pressure regulating valve 11 is operated in the unloaded release state according to the supply pressure of the compressed air G7, the unloading pressure gauge 24 finishes displaying the unloaded state of the pressure regulating valve 11 (Step S111, Yes). ). In this case, the unload pressure gauge 24 displays a zero value as a measurement result of the operating pressure of the pressure regulating valve 11, for example.

  Subsequently, the display pressure of the pressure gauge 23 when the unload pressure gauge 24 finishes displaying the unload state is visually confirmed, and the operating pressure width of the pressure adjusting valve 11 at the present time is confirmed (step S112). Here, when the display of the unload state is finished, the display of the unload pressure gauge 24 is unloaded by the action of the orifice portion 28c of the pipe 28b connected to the discharge port 14a of the pressure regulating valve 11 shown in FIG. The display gradually changes from the display of the state (display of the operating pressure equivalent to the supply pressure of the compressed air G7) to the display of the unload release state (for example, display of the pressure value “0”). For this reason, the operator can easily confirm the display pressure of the pressure gauge 23 when the unload pressure gauge 24 finishes displaying the unload state. In step S112, the display pressure value (supply pressure of the compressed air G7) of the pressure gauge 23 when the unload pressure gauge 24 starts to change to the display of the unload release state is used as the operating pressure of the pressure regulating valve 11. The lower limit. The operator visually recognizes the lower limit of the operating pressure from the display of the pressure gauge 23, and determines the difference between the upper limit of the operating pressure confirmed in step S109 and the lower limit of the operating pressure in step S112 of the pressure adjusting valve 11 at the present time. Check as working pressure range.

  Next, it is determined whether or not the operating pressure range confirmed in step S112 is appropriate as the operating pressure range required for the pressure regulating valve 11 (step S113). In step S113, when the operating pressure width required for the pressure adjusting valve 11 and the current operating pressure width of the pressure adjusting valve 11 are the same up to the minimum digits, it is determined that the current operating pressure width is appropriate. Is done. For example, when an operating pressure width (0.5 [MPa] or the like) having the first decimal place as the minimum digit is required for the pressure regulating valve 11, the current working pressure width is a numerical value less than the second decimal place. If the numerical values from the most significant digit to the first decimal place are the same (that is, 0.50 to 0.59 [MPa]), the adjustment result is appropriate.

  When the operating pressure width in step S112 described above is not appropriate (step S113, No), the operating pressure width of the pressure regulating valve 11 is adjusted (step S114). In step S114, in order to adjust the operating pressure range of the pressure adjustment valve 11, the screwing amount of the pressure range adjustment unit 16 in the pressure adjustment valve 11 is adjusted. Specifically, the nut 19a of the pressure regulating valve 11 shown in FIG. 6 is loosened so that the pressure width adjusting unit 16 can be rotated. Subsequently, as indicated by an arrow Y1 in FIG. 6, the pressure width adjusting unit 16 is rotated around the longitudinal direction thereof, thereby adjusting the screwing amount of the pressure width adjusting unit 16 with respect to the inside of the upper cylindrical body 13. To do. The pressure width adjusting unit 16 adjusts the lift amount of the valve body 15 through the adjustment of the screwing amount, thereby adjusting the operating pressure width of the pressure adjusting valve 11. For example, if the pressure width adjusting portion 16 is rotated clockwise about the longitudinal central axis toward the upper cylinder 13, the screwing amount of the pressure width adjusting portion 16 increases, and accordingly, the lift of the valve body 15 is increased. The amount decreases. As a result, the operating pressure width of the pressure regulating valve 11 is adjusted narrowly. On the other hand, if the pressure width adjusting portion 16 is turned counterclockwise toward the upper cylindrical body 13 contrary to the above-described adjustment, the screwing amount of the pressure width adjusting portion 16 is reduced, and accordingly, the lift amount of the valve body 15 is increased. To increase. As a result, the operating pressure width of the pressure regulating valve 11 is adjusted widely. After adjusting the operating pressure range in this way, the nut 19a is attached so that the upper cylinder 13 and the lower cylinder 14 are firmly connected from the lower end side of the lower cylinder 14 via the seal members 18b and 18c. Fastened to the outer wall of the pressure width adjusting unit 16. After performing the above step S114, it returns to step S102 mentioned above and repeats the process step after this step S102. That is, the various processing steps up to step S114 are repeated until the operating pressure range in step S112 becomes appropriate as the operating pressure range required for the pressure regulating valve 11.

  On the other hand, when the operating pressure range in step S112 described above is appropriate (step S113, Yes), the upper and lower limits of the operating pressure confirmed in steps S109 and S112 are appropriate as the upper and lower limits of the operating pressure required for the pressure regulating valve 11 Is determined (step S115). In step S115, when the upper and lower limits of the operating pressure required for the pressure adjusting valve 11 and the upper and lower limits of the operating pressure of the current pressure adjusting valve 11 are the same up to the minimum digits, the current operating pressure width is appropriate. It is judged that. For example, when the lower limit (7.5 [MPa], etc.) of the operating pressure having the first decimal place as the minimum digit is required for the pressure adjustment valve 11, the current lower limit of the operating pressure is the second decimal place or less. Even if the numerical values of are different, if the numerical values from the most significant digit to the first decimal place are the same (that is, 7.50 to 7.59 [MPa]), the adjustment result is appropriate. The same applies to the upper limit of the operating pressure.

  When the upper and lower limits of the operating pressure in step S115 described above are not appropriate (No in step S115), the upper and lower limits of the operating pressure of the pressure regulating valve 11 are adjusted (step S116). In step S116, in order to adjust the upper and lower limits of the operating pressure of the pressure adjusting valve 11, the screwing amount of the operating pressure adjusting unit 17 in the pressure adjusting valve 11 is adjusted. Specifically, the nut 19b of the pressure adjustment valve 11 shown in FIG. 6 is loosened so that the bearing portion 17c of the operating pressure adjustment portion 17 can rotate. Subsequently, as indicated by an arrow Y2 in FIG. 6, the bearing portion 17c is rotated around its longitudinal direction, and thereby the screwing amount of the bearing portion 17c with respect to the inside of the pressure width adjusting portion 16 is adjusted. The operating pressure adjusting unit 17 adjusts the urging force of the spring 17b through adjusting the screwing amount of the bearing unit 17c, thereby adjusting the upper and lower limits of the operating pressure by increasing or decreasing the pressing force of the valve body 15. For example, if the bearing portion 17c is rotated clockwise around the central axis in the longitudinal direction toward the pressure width adjusting portion 16, the screwing amount of the bearing portion 17c increases, and accordingly, the valve based on the biasing force of the spring 17b is increased. The pressing force of the body 15 increases. As a result, the upper and lower limits of the operating pressure of the pressure regulating valve 11 are adjusted so as to shift in the direction of pressure increase. On the other hand, if the bearing portion 17c is turned counterclockwise toward the pressure width adjusting portion 16 contrary to the above-described adjustment, the screwing amount of the bearing portion 17c decreases, and accordingly, the valve body 15 based on the biasing force of the spring 17b. The pressing force decreases. As a result, the upper and lower limits of the operating pressure of the pressure regulating valve 11 are adjusted so as to shift in the pressure reducing direction. After adjusting the upper and lower limits of the operating pressure in this manner, the nut 19b is fastened to the outer wall of the bearing portion 17c so as to firmly connect the pressure width adjusting portion 16 and the bearing portion 17c of the operating pressure adjusting portion 17. After performing the above step S116, it returns to step S102 mentioned above and repeats the process step after this step S102. That is, the various processing steps up to step S116 are repeated until the upper and lower limits of the operating pressure in steps S109 and S112 are appropriate as the upper and lower limits of the operating pressure required for the pressure regulating valve 11.

  On the other hand, when the upper and lower limits of the operating pressure in step S115 described above are appropriate (step S115, Yes), the operating pressure adjustment and function check of the pressure regulating valve 11, that is, the maintenance of the pressure regulating valve 11 is completed. Thereafter, the pressure adjustment valve 11 after completion of maintenance is removed from the valve maintenance facility 21 (step S117), and this process is terminated. In step S117, the pipes 27a, 28a, 28b and the fixing portion 30 are removed from the pressure regulating valve 11 after completion of maintenance. At that time, the inlet valve 25a, the air vent valve 25b, the first air source valve 29a, the second air source valve 29b, and the communication valves 29d and 29e of the valve maintenance facility 21 are closed. The blow valves 29c, 29g, 29h of the valve maintenance facility 21 are opened. After the maintenance is completed, the pressure regulating valve 11 is attached to the reciprocating compressor 1 in a state where the maintenance is completed after being removed from the valve maintenance facility 21.

  Here, when adjusting the operating pressure width of the pressure adjusting valve 11 in step S114 described above, the nut 19a is loosened and the pressure width adjusting portion 16 is rotated as shown in FIG. Along with the loosening operation of the nut 19a, the connection lock between the upper cylinder 13 and the lower cylinder 14 via the seal members 18b and 18c is released. In this case, the seal members 18b and 18c are loosened, thereby creating a gap between at least one of the upper cylinder 13 and the lower cylinder 14 and the seal members 18b and 18c, and the pressure regulating valve during maintenance. 11 is leaked.

  In the conventional valve maintenance method in which the pressure adjustment valve 11 is maintained using real gas (coke oven gas, nitrogen gas, etc.) in a state where the pressure adjustment valve 11 is attached to the reciprocating compressor 1, the operating pressure range is as described above. When a gas leak occurs in the pressure regulating valve 11 that is adjusting the actual gas, the actual gas leaks from the pressure regulating valve 11. For this reason, the operator is forced to wear protective equipment such as an air-feeding mask from the viewpoint of preventing carbon monoxide poisoning or oxygen deficiency when maintaining the pressure regulating valve 11.

  On the other hand, in the valve maintenance method according to the embodiment of the present invention, the pressure adjustment valve 11 is attached to the valve maintenance facility 21 separate from the reciprocating compressor 1, and the pressure adjustment is performed using compressed air instead of the actual gas. The valve 11 is maintained. For this reason, even if a gas leak occurs in the pressure regulating valve 11 that is adjusting the operating pressure range, the gas leaking from the pressure regulating valve 11 is compressed air that does not cause the worker to be poisoned by carbon monoxide or lack of oxygen. It is. Accordingly, the operator can safely maintain the pressure regulating valve 11 without falling into a carbon monoxide poisoning or oxygen deficiency state without wearing protective equipment such as an air supply mask.

  When adjusting the upper and lower limits of the operating pressure of the pressure adjusting valve 11 in step S116 described above, the operating pressure adjusting unit 17 is rotated by loosening the nut 19b as shown in FIG. However, the airtightness between the outer wall of the operating pressure adjusting unit 17 and the inner wall of the pressure width adjusting unit 16 is ensured by the O-ring 18a. Therefore, there is a very low possibility that gas leakage will occur in the pressure adjustment valve 11 while adjusting the upper and lower limits of the operating pressure.

  As described above, in the embodiment of the present invention, the load control valve of the compressor is removed from the compressor and connected to a pressure tank different from the compressor through a pipe, and the compressed gas by the compressor is used. Simulating a discharge-side pressure tank that stores and discharges pressure, supplies compressed air from the pressure tank to the load control valve, and displays the supply pressure of the compressed air to the load control valve on the pressure gauge of the pressure tank. However, the supply pressure of the compressed air is adjusted by the pressure adjusting means. Further, when the load control valve is operated in an unloaded state according to the supply pressure of the compressed air, the fact that the unloaded state is displayed is displayed on the indicator, and the fact that the unloaded state is displayed on the indicator. During the period, the supply pressure of the compressed air is displayed on the pressure gauge of the pressure tank as the operating pressure of the load control valve.

  Therefore, based on the supply pressure of compressed air to the load control valve while reproducing the operating state of the load control valve in the compressor on the load control valve removed from the compressor, the current operating pressure range of the load control valve and The upper and lower limits of the operating pressure can be easily confirmed. Based on the results of this check on the operating pressure, the operating pressure range and upper and lower limits of the operating pressure of the load control valve can be easily adjusted to match the required pressure range, and in parallel with the maintenance of the compressor, Maintenance can proceed at the same time. As a result, the time from when the compressor is stopped to when the load control valve maintenance work is completed and when the operation of the compressor is restarted can be shortened as much as possible. Furthermore, since the load control valve is maintained using compressed air instead of actual gas, even if a gas leak occurs in the load control valve being maintained, the leaking gas can be used as compressed air. Therefore, the operator can maintain the load control valve without falling into carbon monoxide poisoning or lack of oxygen without wearing protective equipment such as an air supply mask. As a result, the compressor stop period when the load control valve is maintained can be shortened as much as possible, and the load on the operator can be reduced and the load control valve can be maintained safely.

  Further, in the embodiment of the present invention, an unload pressure gauge that measures and displays the operating pressure of the load control valve required for the unload state is used as the display meter that displays that the load control valve is in the unload state. ing. For this reason, by comparing the display content of the pressure gauge of the pressure tank and the display content of the unload pressure gauge, whether or not the load control valve is in the unload state, gas leakage occurs in the load control valve. Whether the load control valve is in an unloaded state or not can be confirmed in detail and simply. As a result, the operating pressure of the load control valve can be adjusted with high accuracy, and the load control valve can be appropriately provided according to the state of the load control valve.

  Further, in the embodiment of the present invention, since the needle valve is used as the pressure adjusting means, the supply pressure of the compressed air to the load control valve can be easily finely adjusted. As a result, the operating pressure of the load control valve can be finely adjusted with high accuracy.

  In the embodiment of the present invention, since the cleaning liquid valve that allows the injection of the cleaning liquid into the load control valve is provided, the cleaning liquid is injected into the load control valve through the cleaning liquid valve, and the inside of the load control valve is appropriately Can be washed. As a result, the situation where the supply pressure of compressed air to the load control valve increases excessively and the situation where the operation of the load control valve is hindered due to adhesion of foreign matters such as oil can be easily eliminated.

  Furthermore, in the embodiment of the present invention, an orifice is provided in a pipe (discharge pipe) connected to the discharge port of the load control valve, and when the load control valve cancels the unload state, the load control valve compresses through the discharge pipe. It is configured to discharge a small amount of air. For this reason, the display change can be gradually advanced from the display of the unload state to the display of the unload release state, which facilitates the display pressure by the pressure gauge of the pressure tank when the display of the unload state is finished. Can be confirmed. As a result, it is possible to accurately determine the lower limit of the operating pressure of the load control valve, and from this, the width and upper and lower limits of the operating pressure of the load control valve can be adjusted more easily and with high accuracy.

  In the above-described embodiment, the unload pressure gauge 24 is used as a display meter for indicating that the load control valve (pressure regulating valve 11) is in the unloaded state. However, the present invention is not limited to this. . That is, instead of using a pressure gauge that measures and displays the operating pressure of the load control valve, an unloading of the load control valve is performed using a display meter that displays or indicates information indicating whether or not the load control valve is in an unloaded state. The state may be displayed.

  In the above-described embodiment, the load control valve is cleaned when the supply pressure of the compressed air to the load control valve is excessive. However, the present invention is not limited to this, and the supply pressure of the compressed air is excessive. In this case, the load control valve may be adjusted so as to reduce the operating pressure of the load control valve, or the adjustment of the load control valve and cleaning of the load control valve may be used in combination.

  Furthermore, in the above-described embodiment, the upper and lower limits of the operating pressure are adjusted after adjusting the operating pressure width of the load control valve. However, the present invention is not limited to this, and after the upper and lower limits of the operating pressure of the load control valve are adjusted. The operating pressure range may be adjusted.

  Further, in the above-described embodiment, the compressed air whose pressure is increased by the compressed air of the air cylinder is used as the compressed air supplied to the load control valve, but the present invention is not limited to this. In other words, if the compressed air pressure supplied by the factory compressor is necessary and sufficient as the compressed air supply pressure to the load control valve, the compressed air from this factory can be used as a load control valve without increasing the pressure. You may supply. In this case, it is not necessary to provide the air cylinder, the piping leading to it, and the second air source valve in the valve maintenance facility according to the present invention.

  Furthermore, in the above-described embodiment, the pressure regulating valve 11 that is operated by gas pressure has been described as a load control valve to be maintained. However, the present invention is not limited to this, and the load control valve to be maintained in the present invention is an electric valve. It may be. Further, the load control valve to be maintained in the present invention is not limited to the load control valve of the reciprocating compressor, but may be a load control valve of a compressor other than the reciprocating compressor such as a screw compressor or a scroll compressor.

  Further, the present invention is not limited by the above-described embodiment, and the present invention includes a configuration in which the above-described constituent elements are appropriately combined. In addition, all other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above-described embodiments are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Reciprocating compressor 2,3 Compressor main body 2a, 2b, 3a, 3b Suction valve 2c, 2d, 3c, 3d Discharge valve 2e, 2f, 3e, 3f Unloader 4 Drive part 5 Intercooler 6 After cooler 7 Receiver tank 8a-8d , 10a to 10c, 26a to 26c, 27a to 27e, 28a, 28b Piping 9a Inlet valve 9b Outlet valve 9c Solenoid valve 11 Pressure adjusting valve 12 Inlet 13 Upper cylinder 13a Flow port 14 Lower cylinder 14a Discharge port DESCRIPTION OF SYMBOLS 15 Valve body 15a Strainer 16 Pressure width adjustment part 17 Operating pressure adjustment part 17a Valve body support shaft 17b Spring 17c Bearing part 18a O-ring 18b, 18c Seal member 19a, 19b Nut 21 Valve maintenance equipment 22 Pressure tank 23 Pressure gauge 24 Unloader pressure Total 25a Inlet valve 25b Air vent valve 28c Orifice part 2 a first air source valve 29b second air source valve 29c, 29g, 29h, 29i blow valve 29d, 29e communicating valve 29f safety valve 29j cleaning liquid valve 30 fixing portion 31 air cylinder G1 actual gas G2 compressed gas Y1, Y2 arrow

Claims (10)

In the valve maintenance equipment used for maintenance of a load control valve for controlling the load of the compressor according to the gas pressure on the discharge side of the compressor,
A pressure tank that is connected to the load control valve removed from the compressor through a pipe, simulates a discharge-side pressure tank that stores and discharges compressed gas by the compressor, and supplies compressed air to the load control valve; ,
Pressure adjusting means for adjusting the supply pressure of the compressed air to the load control valve to operate the load control valve;
An indicator for indicating that the load control valve is operated in an unloaded state in which the compressor can be controlled in a no-load state in accordance with a supply pressure of the compressed air;
The supply pressure of the compressed air to the load control valve is displayed, and the supply pressure of the compressed air is required for the unload state during a period in which the indicator displays the unload state of the load control valve. A pressure gauge to display as the operating pressure of the load control valve;
A valve maintenance facility characterized by comprising The indicator is an unload pressure gauge that measures and displays an operating pressure of the load control valve required for the unload state,
The pressure gauge displays the supply pressure of the compressed air equivalent to the operating pressure of the load control valve displayed by the unload pressure gauge when the load control valve is in the unload state. The valve maintenance facility according to claim 1. The pressure adjusting means is
An inlet valve that adjusts an increase in the supply pressure of the compressed air to the load control valve by adjusting an inflow amount of the compressed air to the pressure tank;
An air vent valve that adjusts to reduce the inflow of the compressed air into the pressure tank to adjust a decrease in the supply pressure of the compressed air to the load control valve;
The valve maintenance facility according to claim 1, wherein the valve maintenance facility is configured by.   The valve maintenance facility according to claim 3, wherein the inlet valve and the air vent valve are configured using a needle valve.   5. The cleaning liquid valve according to claim 1, further comprising a cleaning liquid valve that is openable and closable in a pipe that communicates with the load control valve, and that allows the cleaning liquid to be injected into the load control valve. Valve maintenance equipment. In a valve maintenance method for maintaining a load control valve for controlling the load of the compressor according to the gas pressure on the discharge side of the compressor,
For the load control valve that is removed from the compressor and connected to a pressure tank of a valve maintenance facility through a pipe, a discharge-side pressure tank that stores and discharges compressed gas by the compressor is simulated, and compressed air is discharged from the pressure tank. A compressed air supply step to supply;
Supply air pressure adjustment step of operating the load control valve by adjusting the supply pressure of the compressed air by a pressure adjusting means while displaying the supply pressure of the compressed air to the load control valve on the pressure gauge of the pressure tank When,
When the load control valve is operated in an unload state in which the compressor can be controlled to a no-load state according to the supply pressure of the compressed air, the fact that the load control valve is in the unload state is displayed on a display meter. An unload status display step;
Operating pressure for displaying the pressure of the compressed air on the pressure gauge as the operating pressure of the load control valve required for the unloading state during a period when the unloading state of the load control valve is displayed on the indicator. A display step;
The valve maintenance method characterized by including. The unload state display step uses an unload pressure gauge as the display meter, and measures and displays the operating pressure of the load control valve required for the unload state by the unload pressure gauge,
In the operation pressure display step, when the load control valve is in the unload state, the supply pressure of the compressed air equivalent to the operation pressure of the load control valve displayed by the unload pressure gauge is displayed by the pressure gauge. The valve maintenance method according to claim 6, wherein:   In the supply air pressure adjusting step, an inlet valve and an air vent valve of the pressure tank are used as the pressure adjusting means, and an inflow amount of the compressed air to the pressure tank is adjusted by the inlet valve to the load control valve. Adjusting the increase in the supply pressure of the compressed air and adjusting the decrease in the supply pressure of the compressed air to the load control valve by adjusting the inflow amount of the compressed air to the pressure tank by the air vent valve. The valve maintenance method of Claim 6 or 7 characterized by these.   The valve maintenance method according to claim 8, wherein a needle valve is used as the inlet valve and the air vent valve.   Including a valve cleaning step of opening and closing a cleaning liquid valve provided in a pipe leading to the load control valve, allowing the cleaning liquid to be injected into the load control valve, and cleaning the inside of the load control valve with the injected cleaning liquid. The valve maintenance method as described in any one of Claims 6-9 characterized by these.

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