KR20220087277A - Pressure reducing valve device for high pressure fluid having Variable Accumulator - Google Patents

Abstract

The present invention relates to a pressure reducing valve capable of remotely and precisely controlling the secondary pressure in a pressure test device or the like with a simple structure.
According to the present invention, the valve housing includes a first chamber 16 formed between an inlet 12 and an outlet 14 and a second chamber 18 disposed coaxially with the first chamber 16 and communicating with each other. (2) and a valve body 20 elastically supported by a spring 26 in the first chamber 16 and opening and closing between the inlet 12 and the outlet 14 as they move forward and backward in the axial direction; A piston which is disposed axially forward and backward in the second chamber 18 , a balance chamber 24 is formed between the second chamber 18 and the second chamber 18 at the rear end, and is in contact with the rear end of the valve body 20 at the front end. (22), an accumulator (30) coupled to the rear end of the valve housing (2), communicating with the rear end of the second chamber (18), and maintaining a constant pressure supplied to the balance chamber (24); A flow path between the pressure sensor 34 provided on the outlet 14 side and the inlet 12 of the valve housing 2 and the balance chamber 24 or between the balance chamber 24 and the drain 28 is selectively selected and a controller 50 for controlling the operation of the solenoid valve 40 according to the detection of the pressure sensor 34 on the outlet 14 side, and the valve housing (2) A main block (3) having a first chamber (16) formed at opposite positions with an inlet (12) and an outlet (14) offset from each other and a second chamber (18) communicating with the first chamber (16); The bottom block 4 is sealed to the bottom of the first chamber 16 and to which the spring 26 is installed, and the upper part of the second chamber 18 is sealed to the top of the main block 3 . It is assembled into an upper block 5 having a flow path 31 connecting the accumulator 30 and the second chamber 18 while closing,
The accumulator 30 communicates with the balance chamber 24 and includes a gas container C, the pressure maintaining gas is accommodated in the gas container C, and the solenoid valve 40 When the pressure supplied to the equilibrium chamber 24 is equal to or greater than the set value, the pressure maintaining gas is compressed in the gas container C, and when the pressure supplied to the equalization chamber 24 is less than or equal to the set value, the gas container C ) is a pressure reducing valve device for high-pressure fluid, characterized in that the pressure supplied to the balance chamber 24 is constantly maintained in such a way that the pressure maintaining gas expands in the inside.

Description

Pressure reducing valve device for high pressure fluid having Variable Accumulator

The present invention relates to a pressure reducing valve device for a high pressure fluid having a variable accumulator, and more particularly, to a pressure reducing valve device for a high pressure fluid having a new structure having an accumulator capable of variably extending a pressure control range.

In a pressure test device to test for leaks in a pipe or water tank, or a pressure washing device that sprays pressurized water to remove scale, test the internal pressure by spraying water at a relatively high pressure to the pipe or container, or scale trapped inside the pipe. or foreign matter to be removed. In addition, pressure test devices such as pipes and tanks test the withstand pressure by applying water pressure with various test pressures according to the type of object and design conditions. A pressure reducing valve is employed to control the pressure on the input side of the pressure test device or pressure washing device.

The test pressure that the pressure reducing valve provides to the test subject through a pressure test device or pressure washing device where high pressure acts is a pressure that does not break the pipe or tank under test, for example, a pressure of about 95% of the yield point of the test subject. It should work continuously for a certain period of time (test time). That is, the test pressure provided by the pressure reducing valve should be provided while maintaining the same pressure during the test time.

The test pressure must be provided while maintaining a pressure of about 95% of the yield point during the test period. .

Therefore, an accumulator is installed in the pressure reducing valve so that the output is kept constant. Since the allowable pressure of accumulator products on the market is predetermined, the pressure reducing valve cannot be applied to a wide range of pressure test devices, which is a problem.

The present invention has been proposed in view of the problems of the conventional pressure reducing valve device for high-pressure fluid as described above, and the present invention is a pressure-reducing valve device applied to a pressure test device in which high pressure acts, and can variably expand the pressure control range. An object of the present invention is to provide a pressure reducing valve device for a high-pressure fluid of a new structure having an accumulator.

According to one aspect of the present invention, a first chamber 16 formed between the inlet 12 and the outlet 14, and a second chamber 18 arranged coaxially with the first chamber 16 and communicating with each other ) is formed in the valve housing 2, and the valve body is elastically supported by a spring 26 in the first chamber 16 and opens and closes between the inlet 12 and the outlet 14 as they move forward and backward in the axial direction. (20) and the second chamber (18) arranged to move forward and backward in the axial direction, a balance chamber (24) is formed between the second chamber (18) at the rear end, and the valve body (20) at the front end. The piston 22 in contact with the rear end and the accumulator coupled to the rear end of the valve housing 2 and communicating with the rear end of the second chamber 18 to constantly maintain the pressure supplied to the balance chamber 24 ( 30), a pressure sensor 34 provided on the side of the outlet 14, and between the inlet 12 of the valve housing 2 and the balance chamber 24 or the balance chamber 24 and the drain 28 ) including a solenoid valve 40 selectively opening and closing the flow path between The valve housing (2) is a main block in which the first chamber (16) formed at the opposite positions where the inlet (12) and the outlet (14) are offset and the second chamber (18) communicating with the first chamber (16) are formed. (3), a bottom block 4 sealingly coupled to the bottom of the first chamber 16 and having the spring 26 installed, and sealingly coupled to an upper portion of the main block 3, the second chamber ( 18) is assembled into an upper block 5 having a flow path 31 connecting the accumulator 30 and the second chamber 18 while closing the upper part,

The accumulator 30 communicates with the balance chamber 24 and includes a gas container (C), the pressure maintaining gas is accommodated in the gas container (C), the solenoid valve (40) When the pressure supplied to the equilibrium chamber 24 is equal to or greater than the set value, the pressure maintaining gas is compressed in the gas container C, and when the pressure supplied to the equalization chamber 24 is less than or equal to the set value, the gas container C ) to provide a pressure reducing valve device for high-pressure fluid, characterized in that the pressure supplied to the balance chamber (24) is constantly maintained in such a way that the pressure maintaining gas expands within it.

In addition, according to an embodiment, in order to be able to vary the range of pressure control that the accumulator 30 is responsible for, there are a plurality of accumulators 30, and the plurality of accumulators 30 are individually controlled on/off. It can be characterized as being.

In addition, according to an embodiment, the plurality of accumulators 30 includes a first accumulator 310, a second accumulator 320, and a third accumulator 330, and each accumulator is connected to a control unit, The controller includes a first pressure control range in which the first accumulator 310 is opened and the second accumulator 320 and the third accumulator 330 are closed, the first accumulator 310 and the second accumulator A second pressure control range in which 320 is opened and the third accumulator 330 is closed, the first accumulator 310, the second accumulator 320, and the third accumulator 330 are both open It may be characterized in that one of the third pressure control ranges is selectively controlled.

According to an embodiment of the present invention, it is possible to provide a pressure reducing valve device for a high pressure fluid of a new structure having an accumulator capable of variably extending a pressure control range as a pressure reducing valve device applied to a pressure test device on which a high pressure acts. .

1 shows a cross-sectional configuration diagram of a pressure reducing valve device according to the related art.
2 is a cross-sectional view showing a pressure reducing valve device according to an embodiment of the present invention.
3 is a cross-sectional view showing a pressure reducing valve device according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described. 2 is a cross-sectional configuration diagram of an embodiment of the present invention. As shown, according to the present invention, the main block 3, the bottom block 4, and the upper block 5 are combined to include a valve housing (2). In the main block 3 of the valve housing 2, the inlet 12 and the outlet 14 are offset and formed at opposite positions, and the first chamber 16 is coaxially coaxially disposed on the first chamber 16. A second chamber 18 communicating with the . Water or fluid of a relatively high pressure is introduced into the inlet 12, and water or fluid decompressed to a certain level is discharged to the outlet 14 side.

An opening 6 is formed at the bottom of the first chamber 16 , and the bottom block 4 is coupled to the opening 6 to partition the lower portion of the first chamber 16 . A hollow sheet member 7 is coupled to the circumferential wall of the first chamber 16 , and the inner space of the sheet member 7 substantially forms the first chamber 16 . And inside the first chamber 16, specifically, in the seat member 7, the valve body 20 is watertightly coupled to move forward and backward along the axial direction to open and close the flow path between the inlet 12 and the outlet 14. do. In the illustrated embodiment, the periphery of the bottom surface of the seat member 7 forms a seat portion, and when the head portion of the lower end of the valve body 20 rises and comes into contact with the seat portion of the seat member 7, the flow path is blocked and the valve body 20 ) is lowered, the fluid flows through the groove around the valve body 20 . As the valve body 20 descends a lot, the flow path increases and the flow rate increases. A spring 26 is installed in the concave portion 27 formed in the bottom block 4 to upwardly press the valve body 20 .

On the other hand, an opening 8 is formed in the upper portion of the second chamber 18 formed in the upper portion of the first chamber 16 , and the upper block 5 is coupled to the opening 8 to form the second chamber 18 . partition the upper part. And a hollow sleeve 9 is coupled to the circumferential wall of the second chamber 18, and the inner space of the sleeve 9 substantially forms the second chamber 18, and the piston 22 therein This watertight coupling is liftable. A protrusion 25 is formed at the lower end of the piston 22 to contact the valve body 20 in the first chamber 16 , and a balance chamber 24 is provided in the second chamber 18 at the upper end of the piston 22 . this is formed

In addition, the accumulator 30 communicating with the balance chamber 24 through the flow path 31 is coupled to the upper block 5 of the valve housing 2 .

The accumulator 30 is filled with a pressure maintaining gas, such as nitrogen gas, in the gas container C inside, and is coupled to the rear end of the valve housing 2 to communicate with the rear end of the second chamber 18 . The solenoid valve 40 supplies the set pressure to the balance chamber 24 to precisely control the flow rate of the pressure reducing valve device. However, even when the pressure of the fluid provided by the solenoid valve 40 changes due to an unexpected environment, the pressure reducing valve device must be able to discharge water of a set pressure. In order to solve this problem, the accumulator 30 performs a pressure maintenance function to maintain a preset pressure inside the balance chamber 24 even if the pressure of the fluid provided by the solenoid valve 40 changes due to an unexpected cause. .

For example, when the pressure provided by the solenoid valve 40 is higher than the set value, when the pressure provided to the balance chamber 24 pressurizes the gas container C, the nitrogen gas in the gas container C is pushed up, and the nitrogen gas While contracting, the pressure provided by the solenoid valve 40 is lowered to a set value to maintain the pressure inside the balance chamber 24, and when the pressure provided is lowered, the nitrogen gas expands again to maintain the pressure inside the balance chamber 24 .

According to this structure, the downward pressing force applied to the piston 22 by the nitrogen (N ₂ ) gas pressure charged in the accumulator 30 is constantly maintained. By balancing the downward pressing force applied to the piston 22 held constant by the accumulator 30 and the upward pressing force of the spring 26 applied to the valve body 20, the valve body 20 is moved to the first chamber 16 ) to open and close the flow path between the inlet 12 and the outlet 14 or to adjust the opening degree.

The accumulator 30 can control the pressure of the balance chamber 24 within a designed pressure range. Referring to FIG. 1 , in the conventional pressure reducing valve device, one accumulator 30 is installed, and one Since the range of pressure that can be controlled by the accumulator 30 is limited, for example, when the accumulator can control the pressure from 1Kg to 100Kg, when the pressure of the fluid provided by the solenoid valve 40 exceeds 100Kg, gas In the container C, there is no more space for the nitrogen gas to be pushed up, and since the nitrogen gas is contracted to the maximum value of the nitrogen gas that can be contracted, the nitrogen gas can no longer be contracted to reduce the internal pressure of the equilibrium chamber 24. It cannot be maintained at the set value.

In order to solve this problem, in the accumulator 30 according to the present embodiment, the range of pressure control is varied. Since the range of pressure controllable by one accumulator 30 is limited, a plurality of accumulators 30 according to the present embodiment may be provided in order to vary the pressure range controlled by the accumulator 30 . In addition, the plurality of accumulators 30 may be individually turned on and off by having an on-off valve installed at the inlet, respectively.

According to an embodiment, the plurality of accumulators 30 may include, for example, a first accumulator 310 , a second accumulator 320 , and a third accumulator 330 . In this case, the control logic of the control unit for controlling the accumulator 30 according to the present embodiment includes a first-stage pressure control capable of controlling the pressure provided by the solenoid valve 40 from 1Kg to 100Kg, and the solenoid valve 40 . The second-stage pressure control that can control the pressure provided by the solenoid valve 40 from 100Kg to 200Kg, and the third-stage pressure control that can control the pressure provided by the solenoid valve 40 from 200Kg to 300Kg can be configured. .

In order to control the plurality of accumulators 30 , the pressure reducing valve device according to the present embodiment may include an adapter 400 . One side of the adapter 400 according to the present embodiment communicates with the balance chamber 24 and the other side communicates with the accumulator 30 .

In the above-described example, the adapter 400 has a flow path formed therein. One side of the adapter 400 is formed with a main flow path 410 communicating with the balance chamber 24, and a first flow path 420 connecting the main flow path 410 and the first accumulator 310, and the main flow path ( A second flow path 430 that connects the 410 and the second accumulator 320 and a third flow path 440 that connects the main flow path 410 and the third accumulator 330 may be formed.

A first flow path control valve 421 that controls the operation of the first accumulator 310 may be installed in the first flow path 420 , and the second flow path 430 controls the operation of the second accumulator 320 . A second flow path control valve 431 may be installed, and a third flow path control valve 441 for controlling the operation of the third accumulator 330 may be installed in the third flow path 440 . The first flow path control valve 421 , the second flow path control valve 431 , and the third flow path control valve 441 may be controlled, respectively.

How to operate a plurality of accumulators will be described. In the above example, the operator opens the first flow path control valve 421 and opens the second flow path control valve 431 and the third flow path control valve ( 441) can control closing.

In addition, in order to control the pressure control of the accumulator 30 to be allowed from 1Kg to 200Kg, the first flow path control valve 421 and the second flow path control valve 431 are opened, and the third flow path control valve 441 is closed. can control. In addition, in order to control the pressure control of the accumulator 30 to be allowed from 1Kg to 300Kg, the first flow path control valve 421, the second flow path control valve 431, and the third flow path control valve 441 are all opened. can take control

The configuration of the variable accumulator 30 according to the present embodiment controls the opening or closing of the first accumulator 310, the second accumulator 320, and the third accumulator 330 to disperse the space of the control pressure so that nitrogen gas is pushed and pushed. By expanding the space to advance, the range of control pressure can be expanded.

In addition, the plurality of accumulators 30 according to the present embodiment are individually controlled on and off, respectively. In the above example, the plurality of accumulators 30 include the first accumulator 310, the second accumulator 320, and the second accumulator 30. When three accumulators 330 are included, each accumulator 30 is connected to a control unit, wherein the control unit opens the first accumulator 310 and closes the second accumulator 320 and the third accumulator 330 . A first pressure control range of Both the second accumulator 320 and the third accumulator 330 may select and control one of the open third pressure control ranges. That is, the control unit may control to select one of the first pressure control range, the second pressure control range, and the third pressure control range.

On the other hand, a pressure sensor 34 for detecting the secondary side water pressure of the valve device is disposed on the outlet 14 side of the valve housing 2, and a target pressure value can be set by receiving the detection signal of the pressure sensor 34 A controller 50 is provided. The controller 50 is configured as a separate body from the valve housing 2 and is disposed at a spaced apart position.

In addition, according to the present invention, the solenoid valve 40 is provided between the flow path 38 opened to the inlet 12 side of the valve housing 2 and the flow path 36 communicating with the balance chamber 24 . In the illustrated embodiment, this solenoid valve 40 is composed of a three-way three-position valve, and the neutral position where the flow path is blocked, and the balance chamber 24 and the inlet 12 communicate with each other to reduce the pressure in the balance chamber 24 . It includes a pressure-increasing position for increasing the pressure, and a pressure-reducing position for reducing the pressure in the balance chamber 24 by connecting the balance chamber 24 and the drain 28 .

According to this configuration, when the device of the present invention is used for a pressure test of a tank or a pipe, the controller ( 50), by remotely controlling the solenoid valve 40 from the neutral position to the pressure increasing position, the high pressure at the inlet 14 side is supplied to the balance chamber 24 of the second chamber 18, and the water pressure in the balance chamber 24 is increased, and thus the piston 22 overcomes the elastic force of the spring 26 and descends while the valve body 20 also descends to further open the flow path, thereby increasing the flow rate and increasing the pressure on the outlet 14 side. And when the pressure of the outlet 14 reaches the set value, the controller 50 controls the solenoid valve 40 to return it to the neutral position. If the pressure at the outlet 14 is detected by the pressure sensor 34 and is higher than the set value, the controller 50 remotely controls the solenoid valve 40 from the neutral position to the decompression position, so that the accumulator 30 or the equilibrium chamber The pressure of 24 is discharged to the drain 28 to reduce the pressure, and accordingly, the pressing force of the spring 26 overcomes the pressure of the accumulator 30 and raises the valve body 40 to reduce the flow path, thereby reducing the flow rate and Reduce the water pressure on the shaft of the outlet (14). And when the pressure of the outlet 14 reaches the set value, the controller 50 returns the solenoid valve 40 to the neutral position.

According to this structure, it is possible to set or change the target pressure on the outlet 14 side of the valve device through the controller 50 installed at a position separated from the valve device, and the pressure on the outlet 14 side during operation of the valve device When it is lower or higher than the set value, it is detected and the solenoid valve 40 is controlled in real time through a remote-installed controller to supply a relatively high pressure on the inlet 12 side to the balance chamber 24 or By regulating the opening degree of the valve body 40 by discharging the pressure to the drain 28 , it is possible to precisely control the water pressure at the outlet 14 in real time.

3 is a cross-sectional view and an external view of another embodiment of the present invention. Unlike the embodiment of FIG. 2 in which the solenoid valve 40 controls pressure increase and pressure reduction simultaneously, the inlet 12 side of the valve housing 2 and A pressure boosting sol valve unit 42 that opens and closes the flow path 36 connecting the balance chamber 24 to increase the pressure in the balance chamber 24 to increase the secondary side water pressure, and the balance chamber 24 and the drain 28 A pressure reducing sol valve unit 44 for reducing the secondary side water pressure by opening and closing the flow path 39 connecting ) is an embodiment controlled by

Claims (3)

A valve housing (2) having a first chamber (16) formed between the inlet (12) and the outlet (14) and a second chamber (18) coaxially disposed with the first chamber (16) and communicating with each other (2) and a valve body 20 that is elastically supported by a spring 26 in the first chamber 16 and opens and closes between the inlet 12 and the outlet 14 as they move forward and backward in the axial direction; A piston 22 that is disposed axially forward and backward in the chamber 18 and has a balance chamber 24 formed between the second chamber 18 and the second chamber 18 at the rear end and is in contact with the rear end of the valve body 20 at the front end. and an accumulator 30 coupled to the rear end of the valve housing 2 and communicating with the rear end of the second chamber 18 to constantly maintain the pressure supplied to the balance chamber 24, and the outlet 14 ) to selectively open and close the flow path between the pressure sensor 34 provided on the side and the inlet 12 of the valve housing 2 and the balance chamber 24 or between the balance chamber 24 and the drain 28 a solenoid valve 40 and a controller 50 for controlling the operation of the solenoid valve 40 according to the detection of the pressure sensor 34 on the outlet 14 side, and the valve housing 2 has an inlet ( a main block (3) having a first chamber (16) formed at opposing positions with an offset (12) and an outlet (14) and a second chamber (18) communicating with the first chamber (16); The bottom block 4 is sealed to the bottom of the chamber 16 and the spring 26 is installed, and the main block 3 is sealed to the upper part of the second chamber 18 while closing the upper part. It is assembled with an upper block 5 having a flow path 31 connecting the accumulator 30 and the second chamber 18,
The accumulator 30 communicates with the balance chamber 24 and includes a gas container C, the pressure maintaining gas is accommodated in the gas container C, and the solenoid valve 40 When the pressure supplied to the equilibrium chamber 24 is equal to or greater than the set value, the pressure maintaining gas is compressed in the gas container C, and when the pressure supplied to the equalization chamber 24 is less than or equal to the set value, the gas container C ), a pressure reducing valve device for high-pressure fluid, characterized in that it maintains a constant pressure supplied to the balance chamber (24) in such a way that the pressure maintaining gas expands in the inside. The accumulator (30) of claim 1, wherein the accumulator (30) is plural, and the plurality of accumulators (30) are individually controlled on/off in order to vary the range of pressure control that the accumulator (30) is responsible for. A pressure reducing valve device for high-pressure fluid, characterized in that. According to claim 1, wherein the plurality of accumulators (30) include a first accumulator (310), a second accumulator (320), and a third accumulator (330), each accumulator is connected to a control unit, the The control unit includes a first pressure control range in which the first accumulator 310 is opened and the second accumulator 320 and the third accumulator 330 are closed, the first accumulator 310 and the second accumulator ( The second pressure control range in which 320 is opened and the third accumulator 330 is closed, the first accumulator 310, the second accumulator 320, and the third accumulator 330 are both open 3 A pressure reducing valve device for high-pressure fluid, characterized in that it selectively controls one of the pressure control ranges.

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