KR20190101098A - Pilot operated safety valve system - Google Patents

Abstract

The present invention relates to a pilot operation type safety valve system capable of urgently discharging the internal pressure of a dome chamber in an emergency that the pressure is rapidly increased or when a user wants to decrease pressure. According to the present invention, the pilot operation type safety valve system comprises: a pilot valve detecting the pressure in a main valve to discharge excessive pressure; an emergency discharge device urgently discharging the internal pressure of a dome chamber; a manifold providing an installation space for the emergency discharge device; a port unit disposed in the manifold; a pressure chamber providing pressure to a piston; and a packing selectively realizing communication between first and second ports or between the second and third ports in accordance with a moving position of a piston rod.

Description

Pilot operated safety valve system

The present invention relates to a pilot operated safety valve system, and more particularly, to detect a pressure higher than a set pressure in a pilot valve or to cause a problem in a tank or a pipe. The present invention relates to a pilot operated safety valve system capable of urgently discharging the internal pressure of the dome chamber, and preventing the main valve from being opened arbitrarily due to the pressure rise of the main valve outlet in a state where the pilot valve is shielded.

Safety valves are usually mounted on top of pressure vessels or connecting pipes to ensure proper pressure within the system.These safety valves automatically operate when the pressure inside the system rises above the specified pressure (set pressure). It acts as a pressure drop within the specified pressure range and quickly maintains airtightness.

Figure 1 shows an example of a conventional safety valve. The safety valve shown in FIG. 1 includes a main valve part 10 mounted to a storage tank, and a pilot valve part 20 installed on the main valve part 10 to assist the operation of the main valve part. The pilot valve part 20 is operated under pressure first, and then the main valve part 10 is operated.

First, the main valve part 10 is provided with a main inlet port 11a connected to the storage tank and a main discharge port 11b connected to the discharge pipe. The main inlet port 11a and the main discharge port 11b are provided. It has a main valve housing in which the valve inner space 11c is formed.

In addition, the valve inner space 11c is installed to open and close the opening 12, the main valve seat 13 is installed on the main inlet port (11a) is seated.

Meanwhile, the pilot valve part 20 includes a pilot body 21 and a pilot valve 22 coupled to the pilot body 21.

A pressure chamber 21a is formed in the pilot body 21, and a pilot valve seat 21b in which the plunger 22c to be described later is selectively installed is installed in the pressure chamber 21a. In addition, a pilot inlet port 21c connected to the main inlet port 11a and the bypass pipe 30 is formed at one side of the pressure chamber 21a under the pilot valve seat 21b. In addition, a pilot connection port 21d is formed on the pilot valve seat 21b on the other side of the pressure chamber 21a and connected to an upper side of the opening and closing hole 12 by a connection pipe 40. On the upper side of 21d), a pilot discharge port 21e is formed in communication with the outside.

In addition, the pilot valve 22 includes a pilot valve housing 22a, a return spring 22b embedded in the pilot valve housing 22a, and the return spring 22b below the pilot valve housing 22a. And a plunger 22c installed to be elastically supported by the plunger 22c and an opening and closing stopper 22d that is installed outside the plunger so as to be interlocked with the plunger 22c to selectively open and close the pilot discharge port 21e. .

In the conventional safety valve having such a configuration, when an overpressure of a predetermined pressure or more acts on the main inlet port 11a, the opening / closing opening 12 is forcibly raised by the overpressure as shown in FIG. 1, so that the main inlet port 11a and the main outlet are discharged. Since the port 11b communicates, the overpressure is discharged through the main discharge port 11b.

In addition, a part of the overpressure enters the pilot body 21 through the bypass pipe 30 and the pilot inlet port 21c to forcibly push up the plunger 22c lowered by the return spring 22b. The bypass tube 30 and the pressure chamber 21a are in communication.

Therefore, the overpressure entering through the bypass pipe 30 is partially discharged to the pilot discharge port 21e, and the other part enters the opening and closing port 12 through the pilot connection port 21d and the connection pipe 40. However, since the overpressure entering the opening and closing port 12 is a pressure smaller than the overpressure discharged from the main inlet port 11a, the opening and closing port 12 is still maintained in an elevated state.

From this state, when the overpressure flowed in from the main inflow port 11a becomes weak (that is, when the pressure of the main inflow port becomes normal pressure), the plunger 22c is lowered by the elasticity of the return spring 22b. .

Then, the pilot discharge port 21e is blocked by the opening and closing plug 22d, and the bypass pipe 30 is blocked by the plunger 22c, respectively. In addition, the opening and closing opening 12 is pushed down by the air pressure remaining in the connecting pipe 40, the opening and closing opening 12 is lowered, and thus the main inlet port 11a is blocked by the opening and closing opening 12 Will be recovered.

Recently, devices with various functions such as devices for preventing movement to the pilot valve when the pressure rises at the main valve outlet have been developed.

Safety valves equipped with various functions of the device has a problem in that the devices are distributed in a large space and the copper wire is long, so that a lot of work time is required for repair and space utilization is reduced.

In addition, the conventional safety valve of the configuration has a problem that the pressure rises due to a problem in the tank or the pipe, or when the operator needs to open the valve installed for each pipe to discharge the pressure.

Republic of Korea Patent Publication No. 10-1108077

The technical problem of the present invention is to solve the problems mentioned in the background art, the pressure is detected in the pilot valve more than the set pressure or the tank or piping problems caused by a sudden rise in pressure due to a sudden rise in pressure or user needs to reduce the pressure The present invention relates to a pilot operated safety valve system capable of emergencyly discharging the internal pressure of the dome chamber and preventing the main valve from being opened arbitrarily due to the pressure rise of the main valve outlet side while the pilot valve is shielded.

It is an object of the present invention to provide a pilot operated safety valve system equipped with a backflow prevention function that can prevent the main valve from being opened arbitrarily due to the pressure rise of the main valve outlet while the pilot valve is shielded.

It is also an object of the present invention to provide a pilot operated safety valve system having an emergency discharge device, a gas discharge connection, and a field test connection in one manifold for easy repair and management and excellent space utilization.

It is also an object of the present invention to provide a pilot operated safety valve system equipped with a flow control valve that controls the flow rate from the pilot valve outlet to the dome chamber to improve the performance of the valve.

In order to solve the technical problem, the pilot operated safety valve system according to the present invention is provided in the pilot valve and the main valve to discharge the overpressure by sensing the pressure inside the main valve, the vertical movement position by the pressing force and elasticity A piston having a variable variable, a dome chamber for providing a pressing force to the piston at an upper portion of the piston, a disc provided at an end portion of the piston to selectively open and close the main valve according to a movement position of the piston, and the pilot valve When pressure above the set pressure is sensed or a problem occurs in the tank or piping, the pressure rises suddenly or when the user needs to lower the pressure An emergency discharge device for emergency discharge of the internal pressure of the dome chamber and a manifold provided at one side of the main valve, and a first port provided inside the manifold and connected to the pilot valve outlet to provide an installation space of the emergency discharge device; And a second port connected to the dome chamber and a third port connected to an outlet of the main valve, and the emergency discharge device. A variable piston and piston rod, a pressure chamber for providing a pressing force to the piston at an upper portion of the piston, and the first port and the second port or the second port and the third port according to a movement position of the piston rod. It characterized in that the packing to selectively communicate with.

The manifold may further include a gas discharge connection part for discharging the gas at the inlet of the main valve.

The manifold may further include a field test connection part for testing an operation state of the main valve and the pilot valve.

In addition, the line connecting the outlet of the first port and the pilot valve is characterized in that the flow rate control valve for adjusting the flow rate of the fluid flowing into the dome chamber is further provided.

In addition, the packing moving tube for guiding the movement of the packing to control the direction of movement of the fluid is characterized in that it is provided.

According to the pilot operated safety valve with a multifunctional manifold according to the present invention, the following effects can be obtained.

First, the pressure inside the dome chamber is automatically or manually driven when the pilot valve detects a pressure higher than the set pressure or a problem occurs in the tank or piping, and the pressure rises rapidly or when the user needs to lower the pressure. It is effective to discharge the emergency.

Secondly, the present invention relates to a pilot operated safety valve system which can prevent the main valve from being opened arbitrarily due to the pressure rise of the main valve outlet side while the pilot valve is shielded.

Third, the emergency discharge device, the gas discharge connection and the field test connection are installed in one manifold, so that it is easy to repair and manage, the installation is simple, and the space utilization is excellent.

Fourth, there is an effect of improving the performance of the valve by controlling the flow rate moving from the pilot valve outlet to the dome chamber by the flow control valve.

1 is a view showing a conventional pilot operated safety valve and its opening and closing method.
2 is a block diagram of a pilot operated safety valve system according to the present invention.
3 is a view showing the normal operating flow of the pilot operated safety valve system according to the present invention.
4 is a view showing the fluid flow in the operation of the emergency discharge device of the pilot operated safety valve system according to the present invention.
5 is a view showing the fluid flow in the operation of the field test connection of the pilot operated safety valve system according to the present invention.
6 is a view showing a non-return fluid flow of the pilot operated safety valve system according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention.

In addition, in describing the present invention, terms indicating directions such as top / bottom or one side / other side are described so that those skilled in the art can clearly understand the present invention, and thus indicate relative directions. It will not be limited.

First, with reference to the configuration of the pilot operated safety valve system of Figure 2, it will be described in detail with respect to the configuration of the pilot operated safety valve system according to an embodiment of the present invention.

Pilot operated safety valve system according to an embodiment of the present invention, the pilot valve 100, the main valve 200, the emergency discharge device 300, the manifold 400, the port portion.

The pilot valve 100 detects the pressure inside the main valve 200 to be described later to discharge the overpressure.

The pilot valve inlet 110 is formed with a pilot valve inlet 110, a pilot valve first outlet 120, and a pilot valve second outlet 130.

Inside the main valve 200, a piston 210, a dome chamber 220, a disk 230, and a nozzle 240 are provided, and a main valve inlet 250 and a main valve outlet at which fluid is introduced and discharged ( 260).

More specifically, the dome chamber 220 and the main valve inlet 250 communicate vertically inside the main valve 200, and the main valve outlet 260 is connected to one side of the main valve 200. Is formed.

The upper inside of the main valve 200 is provided with a piston 210 that the vertical movement position is changed by the pressing force and elasticity and the fluid flows into the upper portion of the piston 210 to provide a pressing force to the piston 210. The dome chamber 220 is formed.

In addition, the disc 230 is provided at the lower end of the piston 210, and the disc 230 is lifted as the piston 210 moves to open the main valve inlet 250 and the main valve outlet 260. Communicate selectively.

The emergency discharge device 300 is a pressure inside the dome chamber when the pressure above the set pressure is sensed in the pilot valve 100 or when a problem occurs in the tank or the pipe and the pressure is rapidly increased or when the user needs to lower the pressure. It is a device that can release the pressure urgently to lower the pressure quickly.

In addition, the emergency discharge device 300 may be installed to control the operation by a switch in the control room or to be controlled by the operator in manual emergency.

More specifically, as shown in the figure showing the fluid flow during the operation of the emergency discharge device of the pilot operated safety valve system of Figure 4 the air discharge portion installed in the manifold 400 in the emergency discharge device 300 A piston 310, a piston rod 320, a pressure chamber 330, and a packing 340 are included.

Hereinafter, each configuration of the emergency discharge device 300 will be described in detail with reference to FIGS. 2 and 4.

First, the air injection unit is provided on the manifold 400 to be described later, and air is injected.

The piston 310 is provided at the lower portion of the air injection portion and the vertical movement position is changed by the pressing force of the air flowing through the air injection portion and the elastic force of the elastic material provided at the lower portion.

The piston rod 320 is formed in the shape of an elongated rod to be penetrated through the upper portion of the piston 310 so as to be coupled to the piston 310 to be separated can be fastened with a nut.

In addition, a predetermined length of the lower end of the piston rod 320 is formed with a diameter smaller than the diameter of the upper end to form a space in which the fluid can move in the pipeline in which the piston rod 320 moves up and down.

The pressure chamber 330 is injected with air through the air injection unit to provide a pressing force to the piston 310 at the upper portion of the piston 310.

The packing 340 is provided at the lower end of the piston rod 320 and is connected to the packing moving tube (341) for guiding the movement of the packing 340 to communicate with the pipeline in which the piston rod 320 is installed.

The packing moving tube 341 may extend in the longitudinal direction according to the shape of the packing 340, and the moving direction of the fluid is controlled according to the movement of the piston rod 320 and the packing 340.

The manifold 400 is provided on one side of the main valve 200 to provide an installation space of the emergency discharge device (300).

The manifold 400 may further include a gas discharge connection part 600 to discharge the gas of the main valve inlet 250.

In this case, the manifold 400 may be further provided with a fourth port 540 to be connected to the gas discharge connection portion 600 and the main valve inlet 250.

In addition, the manifold 400 may further include a field test connection part 700 to test the operating states of the main valve 200 and the pilot valve 100.

The manifold 400 may further include a fifth port 550 to connect the field test connection 700 and the pilot valve inlet 110.

The emergency discharge device 300, the gas discharge connection portion 600 and the field test connection portion 700 is installed in one of the manifold is easy to maintain and manage, the installation is simple and the advantage of saving work time have.

The port unit is a connection device provided in the manifold 400 and the emergency discharge device 300, the gas discharge connection portion 600 and the field test connection 700 and installed in the manifold 400 It is a configuration for connecting the pilot valve 100 and the main valve 200 is installed on the outside.

The port part communicates with a lower portion of the packing moving tube 341 and communicates with a first port 510 connected to the pilot valve first outlet 120 and to one side of the packing moving tube 341 and the dome chamber 220. The second port 520 and the piston rod 320 is connected to one side of the pipe provided with a third port 530 is connected to the main valve outlet 260 is included.

In addition, a flow regulating valve 800 is provided at an external first line connecting the first port 510 and the pilot valve first outlet 120 to adjust an inflow amount of the fluid flowing into the dome chamber 220. It may be further provided, thereby improving the performance of the valve.

Referring to the drawings showing the normal operating flow of the pilot operated safety valve system of Figure 3, the normal operation flow of the pilot operated safety valve system according to an embodiment of the present invention will be described in detail.

As shown in FIGS. 2 and 3, fluid is introduced into the manifold 400 through an outer fourth line 541 connecting the main valve inlet 250 and the fourth port 540.

Subsequently, an inner fourth line 542 and an inner fifth line 552 communicate with each other to move to the fifth port 550. In this case, the packing may be provided at a point where the inner fourth line 542 and the inner fifth line 552 are connected. In addition, the packing provided in the longitudinal direction of the inner fourth line 542 rises due to the inflow of the fluid and communicates with the inner fifth line 552 to allow the fluid to move to the fifth port 550.

In addition, the fluid flows into the pilot valve 100 through an external fifth line 551 connecting the fifth port 550 and the pilot valve inlet 110.

Again, the pilot valve flows into the manifold 400 through an external first line 511 connecting the first outlet 120 and the first port 510.

In addition, the fluid moves to the packing moving tube 341 communicating with the first port 510, and presses the packing 340 at a lower portion thereof to increase the pressure.

At this time, the fluid is moved to the dome chamber 220 through an inner second line 522 connecting the packing pipe 341 and the second port 520.

Therefore, the piston 210 is pressed by the pressure rise in the dome chamber 22 to maintain the state of the main valve 200 in a state in which the disk 230 is in close contact with the nozzle 240.

After that, when the set pressure of the pilot valve 100 reaches the flow of the fluid will be described.

In order to lower the pressure in the dome chamber 220, the fluid is discharged through an external second line 521 connecting the dome chamber 220 and the second port 520.

The pilot moves through the packing moving tube 341 to the first port 510 and connects the first port 510 to the pilot first outlet 120 through the external first line 511. The valve is moved to the first outlet 120.

At this time, the pilot valve inlet 110 is closed and fluid is discharged to the pilot valve second outlet 130.

Subsequently, the fluid is discharged to the main valve outlet 260 through an external sixth line 561 connecting the pilot valve second outlet 130 and the main valve outlet 260 to discharge the pressure in the dome chamber 220. Can be lowered.

Referring to Figures 2 and 4 will be described the fluid flow in the operation of the emergency discharge device of the pilot operated safety valve system.

The emergency discharge device 300 is automatically or manually when the pilot valve 100 detects a pressure higher than the set pressure or a problem occurs in a tank or a pipe, and when the emergency suddenly increases or the user needs to lower the pressure. It is installed to be driven is a device to immediately discharge the pressure inside the dome chamber 220.

First, air is injected into the pressure chamber 330 through a pneumatic line connected to the emergency discharge device 300 so that the piston 310 descends.

Subsequently, the piston rod 320 presses the packing 340 so that the packing 340 moves to the lower portion of the packing moving tube 341.

In this case, the second port 520 and the packing moving tube 341 are in communication with each other and the fluid is discharged from the dome chamber 220 to the packing moving tube 341.

In addition, the fluid moves to a space formed in a conduit in which the piston rod 320 is provided to move out of the manifold 400 through an inner third line 532 connected to the third port 530.

Fluid is discharged to the main valve outlet 260 through an external third line 531 connecting the third port 530 and the main valve outlet 260.

Fluid flow in operation of the field test connection of the pilot operated safety valve system according to an embodiment of the present invention in detail with reference to the drawings showing the fluid flow in the operation of the field test connection of the pilot operated safety valve system of FIG. Let's find out.

As shown in FIGS. 2 and 5, fluid is moved through the inner fifth line 552 connecting the field test connection 700 and the fifth port 550.

Subsequently, it moves to the external fifth line 551 connecting the fifth port 550 and the pilot valve inlet 110 to flow into the pilot valve 100.

In addition, the pilot valve is introduced into the manifold 400 through the external first line 511 connecting the first outlet 120 and the first port 510.

In addition, the fluid moves to the packing moving tube 341 communicating with the first port 510, and presses the packing 340 at a lower portion thereof to increase the pressure.

In this case, the fluid is moved to the dome chamber 220 through the inner second line 522 connecting the packing moving tube 341 and the second port 520 to change the main valve according to the internal pressure ( 200 and the operating state of the pilot valve 100 can be checked.

As illustrated in FIG. 3, when overpressure occurs in the dome chamber 220, the fluid is reversed and discharged to the main valve outlet 260 through the pilot valve second outlet 130.

Referring to the drawings illustrating the backflow preventing fluid flow of the pilot operated safety valve system of FIG. 6, the backflow preventing fluid flow of the pilot operated safety valve system according to an exemplary embodiment of the present invention will be described in detail.

2 and 6, a function of preventing the main valve 200 from being opened arbitrarily due to the pressure rise of the main valve outlet 260 in the shielded state of the pilot valve 100.

First, when the pressure rises at the main valve outlet 260, the fluid is discharged to the manifold 400 through the external third line 531 connected to the third port 530.

In addition, the fluid moves to the packing moving tube 341 through the space portion of the pipe line in which the piston rod 320 is provided.

In this case, the packing 340 descends from the packing moving tube 341 so that the packing moving tube 341 and the second port 520 communicate with each other and the dome chamber 220 is connected to the outer second line 521. To be discharged.

Therefore, the piston 210 is pressed by the dome chamber 22 to maintain the state of the main valve 200 in a state in which the disk 230 is in close contact with the nozzle 240.

As described above, a preferred embodiment according to the present invention has been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof has ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

100: pilot valve 110: pilot valve inlet
120: pilot valve first outlet 130: pilot valve second outlet
200: main valve 210: piston
220: dome chamber 230: disk
240: nozzle 250: main valve inlet
260: main valve outlet 300: emergency discharge device
310: piston 320: piston rod
330: pressure chamber 340: packing
341: packing moving pipe 400: manifold
510: first port 511: external first line
520: second port 521: external second line
522: second internal line 530: third port
531: external third line 532: internal third line
540: fourth port 541: outer fourth line
542: internal fourth line 550: fifth port
551: outer fifth line 552: inner fifth line
561: outer sixth line 600: gas discharge connection
700: field test connection 800: flow control valve

Claims (5)

A pilot valve which detects a pressure inside the main valve and discharges an overpressure;
A piston which is provided inside the main valve and whose vertical movement position is changed by the pressing force and elasticity, a dome chamber providing the pressing force to the piston at an upper portion of the piston, and a movement position of the piston provided at an end of the piston Disc for selectively opening and closing the main valve according to,
An emergency discharge device for emergency discharge of the internal pressure of the dome chamber when the pilot valve detects a pressure higher than the set pressure or a problem occurs in a tank or a pipe and the pressure rises rapidly or when the user needs to lower the pressure;
A manifold provided at one side of the main valve to provide an installation space of the emergency discharge device;
A port part provided in the manifold and including a first port connected to the pilot valve outlet, a second port connected to the dome chamber, and a third port connected to the outlet of the main valve; And
A piston and a piston rod constituting the emergency discharging device, the moving position of which is varied by pressing force and elasticity in the manifold, a pressure chamber providing pressure to the piston at an upper portion of the piston, and movement of the piston rod And a packing for selectively communicating said first port with said second port or said second port and said third port in accordance with a location. The method of claim 1,
In the manifold,
Pilot operated safety valve system, characterized in that further provided with a gas discharge connection for discharging the gas at the inlet of the main valve. The method of claim 1,
In the manifold,
Pilot operated safety valve system further comprises a field test connection for testing the operating state of the main valve and the pilot valve. The method of claim 1,
Pilot-operated safety valve system characterized in that the line connecting the outlet of the first port and the pilot valve is further provided with a flow rate control valve for adjusting the flow rate of the fluid flowing into the dome chamber. The method of claim 1,
Pilot-actuated safety valve system characterized in that the packing moving tube for guiding the movement of the packing to control the direction of movement of the fluid is provided.

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