KR101207833B1 - Pilot valve actuator and pilot operated safety valve including the same - Google Patents

Abstract

The present invention relates to a pilot operated safety valve, and more particularly, to include a pilot valve actuator for operating the main valve unit in response to pressure fluctuations between the main valve unit and the pilot valve unit to improve accuracy and reliability of valve opening and closing. It relates to a pilot type safety valve that can be.

Description

Pilot Valve Actuators and Pilot Operated Safety Valves Equipped with the Same {{PLOT VALVE ACTUATOR AND PILOT OPERATED SAFETY VALVE INCLUDING THE SAME}

The present invention relates to a pilot operated safety valve, and more particularly, to include a pilot valve actuator for operating the main valve unit in response to pressure fluctuations between the main valve unit and the pilot valve unit to improve accuracy and reliability of valve opening and closing. It relates to a pilot type safety valve that can be.

Safety valves are usually mounted on top of pressure vessels or vacuum tanks or connecting pipes to maintain the proper pressure within the device. It operates automatically when abnormal pressure rises, and keeps airtight quickly after the pressure drop within the specified pressure range.

1 and 2 show an example of a conventional safety valve.

The conventional safety valve shown in FIG. 1 includes a main valve part 10 mounted to a storage tank, and a pilot valve part 20 installed above 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 a storage tank (not shown), and a main outlet port 11b connected to a discharge pipe (not shown). The main inlet port 11a is provided. And a main valve housing 11 in which a valve inner space 11c is formed between the main discharge port 11b and the main discharge port 11b.

In addition, the valve inner space (11c) is the main valve 12 is installed to be elevated, the main valve seat 13 is installed on the main inlet port (11a) is installed.

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 inside the pilot body 21, and a pilot valve seat 21b is installed inside the pressure chamber 21a to selectively mount a plunger 22c to be described later. One side of the pressure chamber 21a below the valve seat 21b is formed with a pilot inlet port 21dc connected to the main inlet port 11a and the bypass pipe 30, and is located above the pilot valve seat 21b. On the other side of the pressure chamber 21a of the pilot connection port 21d which is connected to the upper side of the main valve 12 and the connection pipe 40 is formed, the outside of the pilot connection port 21d And a pilot discharge port 21e in communication with each other are formed.

The pilot valve 22 includes a pilot valve housing 22a, a return spring 22b embedded in the pilot valve housing 22a, and a 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 greater than the prescribed pressure is applied to the main inlet port 11a, the main valve 12 is forcibly raised by the overpressure as shown in FIG. Since the discharge 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 is entered into the main valve 12 through the pilot connection port 21d and the connection pipe 40. . However, since the overpressure entering the main valve 12 is smaller than the overpressure discharged from the main inlet port 11a, the main valve 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 caused by the elasticity of the return spring 22b as shown in FIG. ) Will descend.

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 main valve 12 is pushed down by the air pressure remaining in the connecting pipe 40, the main valve 12 is lowered in the drawing, thereby the main inlet port (11a) by the main valve 12 It will be restored to its original state that it was blocked.

However, in the conventional safety valve described above, the lowering operation of the main valve 12 is operated by the internal pressure in the connecting pipe 40, but the internal pressure in the connecting pipe 40 is set to the outlet pressure of the main inlet port 11a. If the comparison is small, the main valve 12 may not be completely lowered, so the reliability of the airtightness of the main inlet port 11a cannot be guaranteed.

In addition, when overpressure is applied to the main inlet port 11a, the main valve 12 should be lifted by the overpressure, but the main valve 12 is lifted depending on the magnitude of the internal pressure of the connecting pipe 40. There may be a case that does not fall, and even if lifted, it does not work on time and can be operated late so that the response speed is slow, there is a problem that lowers the reliability of the product.

The present invention has been proposed to solve the conventional problems as described above, the main object of the present invention is to provide a pilot type safety valve that can improve the reliability of the product by increasing the response of the valve drive and the accuracy of opening and closing In providing.

The present invention for achieving the above object is a pilot valve actuator 400 that defines the operating relationship between the main valve unit 100 and the pilot valve unit 200, the pilot valve actuator 400 is the main valve unit 100 ) And a plurality of seats ST, which are raised and lowered in association with the elevation of the pilot valve unit 200, and the seats ST, which communicate with the main valve unit 100 and the pilot valve unit 200. It includes a housing 410, the housing 410 is in communication with the main valve unit 100 or the pilot valve unit 200, the port (PT) which is opened and closed by the lifting and lowering of the seat ST further There is one feature to a pilot valve actuator comprising.

In addition, the present invention is a filer valve actuator 400 that defines the operating relationship between the main valve unit 100 and the pilot valve unit 200,

The pilot valve actuator 400 moves up and down in conjunction with the main valve unit 100, and moves up and down in conjunction with the pilot valve unit 200, and thus an upper portion of the lower seat 430. A seat stem 440 connecting the upper sheet 420 and the lower sheet 430 and the upper sheet 420, and the upper and lower sheets 420 and 430 and the sheet stem 440, respectively, And a housing 410 in communication with the valve unit 100 or the pilot valve unit 200, wherein the housing 410 has a housing body 411 having a constant cross section, and a hollow inside the housing body 411. An upper chamber 412 formed as a space and provided with the upper sheet 420, a lower chamber 413 formed below the upper chamber 412 and provided with the lower sheet 430, and the upper chamber 412 and the lower chamber 413 in communication with the upper It includes a communication chamber 414 narrower than the burr 412 and the lower chamber 413, one side of the upper chamber 412 is opened and closed by the lifting and lowering of the upper seat 420, the main valve unit There is another feature of the pilot valve actuator in which a third upper port 403 is formed in communication with 100 to open the male valve unit 100.

At this time, the shape of the end of the communication chamber 414 side of the one end of the upper chamber 412 is formed so that the width becomes narrower toward the communication chamber 414, both ends of the lower chamber 413 The shape is formed such that the width becomes narrower toward the end portion, the upper sheet contact portion (412a) is formed to be inclined to the portion connected to the upper chamber 412 and the connection chamber 414 is in close contact with the upper sheet (420) The lower seat contact portion 413a may be formed to be inclined at a portion connected to the lower chamber 413, the connection chamber 414, and the main valve unit 100 so that the lower seat 430 is in close contact with the lower chamber 413. have.

In addition, one area of the upper chamber 412 is opened only when the upper seat 420 is raised, and communicates with the mail valve unit 100 to allow the lower seat 430 and the upper seat 420 to be linked thereto. A third upper port 403 that raises the) may be formed, and a central port 404 communicating with the main valve unit 100 may be formed on one side of the communication chamber 414.

In addition, the upper chamber 412 is formed in one region, and further includes a first upper port 401 and a second upper port 402 which are opened only when the upper sheet 420 is lowered, and the lower portion The first lower port 405 which is formed in one region of the chamber 413 and is opened only when the lower sheet 430 is raised and the second lower port which is opened when the lower sheet 430 is lowered ( 406 may be further included.

The present invention also provides a pilot operated safety valve including a pilot valve actuator 400 and a male valve unit 100 and a pilot valve unit 200 through which the pilot valve actuator 400 is interposed. The unit 100 includes a first diaphragm 113 which is interlocked with the lower seat 430 of the pilot valve actuator 400, and a first chamber 111 and a first compartment which are partitioned by the first diaphragm 113. A main chamber 110 including a second chamber 112, and a main valve 120 interlocked with the first diaphragm 113, and the pilot valve unit 200 includes a second diaphragm 213. And a pilot chamber 210 including a third chamber 211 and a fourth chamber 212 partitioned by the pilot chamber 230, and a pilot valve 230 interlocked with the upper seat 420 of the pilot valve actuator 400. Another feature of pilot operated safety valves, including pilot valve actuators There.

In this case, a first pipeline 501 connecting the gas inlet 1a to which the main valve 110 communicates with the fourth chamber 212, and branches from the first pipeline 501 to the central port ( The second pipeline 502 connected to the side 404, the third pipeline 503 connecting the third upper port 403 and the second chamber 112, and the second lower port 406. And a fourth pipeline 504 connecting the first chamber 111 and a fifth pipeline 505 connecting the second upper port 402 and the first chamber 111. have.

In addition, the pilot valve 230 is an upper portion for interlocking the diaphragm 231 interlocked with the second diaphragm 213 and the diaphragm 231 and the upper seat 420 of the pilot valve actuator 400. It may include a stem shaft 232, and the elastic unit 300 for pressing and pressing the diaphragm 231.

The pilot operated safety valve according to the present invention can improve the reliability of the product by increasing the response speed and the accuracy of operation of the valve drive by the pilot valve actuator.

1 is a longitudinal cross-sectional view of a conventional pilot type safety valve, an operating state diagram
Figure 2 is a longitudinal sectional view of a conventional pilot type safety valve, the initial state diagram
3 is a longitudinal sectional view of a pilot operated safety valve according to the present invention, the initial state diagram
Figure 4 is a longitudinal cross-sectional view of the pilot operated safety valve according to the present invention, the operating state diagram

Advantages and features of the present invention, and methods of achieving them will become more apparent with reference to the embodiments described below in conjunction with the accompanying drawings.

Figure 3 is a pilot operated safety valve according to the present invention, the gas inlet is a state diagram is blocked, Figure 4 is a pilot operated safety valve according to the present invention, the gas inlet is an open state diagram.

Pilot operated safety valve of the present invention according to the above drawings is installed on the gas inlet (1a) of the gas tank (1) when the gas tank (1) is a normal pressure, close the gas inlet (1a), the gas tank (1) When the overpressure is a safety device for preventing the explosion of the gas tank (1) by opening the gas inlet (1a) to be discharged through the discharge passage 408 as much gas pressure as the overpressure.

In particular, the present invention is a pilot valve actuator 400 and a pilot operated safety valve having the same as described above.

First, the pilot valve actuator 400 of the present invention will be described with reference to the first embodiment.

Example 1

As described above, the pilot valve actuator 400 of the present invention defines an operation relationship between the main valve unit 100 and the pilot valve unit 200, and the pilot valve actuator 400 is configured to control the main valve unit 100. And a plurality of seats ST which are lifted and lowered in association with the lifting and lowering of the pilot valve unit 200, and the housing which receives the seats ST and communicates with the main valve unit 100 and the pilot valve unit 200. 410.

At this time, the housing 410 includes a port (PT) opened and closed by the lifting and lowering of the seat (ST) as being in communication with the main valve unit 100 or the pilot valve unit 200.

That is, when excessive pressure is applied to the main valve unit 100 by the operation of the seat (ST) and the port (PT) can be accurately operated to ensure the reliability of the valve unlike the conventional.

In other words, the conventional pilot operated safety valve includes a main valve part (corresponding to the main valve unit of the present invention) and a pilot valve part (corresponding to the pilot valve unit of the present invention).

Therefore, even when excessive pressure is applied, as described above, there is a problem in that the operation of the main valve is incomplete and thus lowers the reliability of the valve.

The present invention solves this problem, not only driving the main valve when excessive pressure is applied, but also driving the pilot valve actuator so that the pilot valve actuator to drive the main valve even when the main valve itself is not operating The main valve can be operated correctly.

The pilot valve actuator 400 of the present invention will be described again with reference to FIGS. 3 and 4.

Pilot valve actuator 400 of the present invention is the lower seat 430 to move up and down in conjunction with the main valve unit 100, and the lower seat 430 as going up and down in conjunction with the pilot valve unit 200 A top stem 420 disposed on an upper portion of the top sheet, a seat stem 440 connecting between the bottom sheet 430 and the top sheet 420, and the top and bottom sheets 420 and 430 and the seat stem 440. It includes a housing 410 in communication with the main valve unit 100 or the pilot valve unit 200.

At this time, the housing 410 is a housing main body 411 having a constant cross-section, the upper chamber 412 is formed as an empty space inside the housing main body 411, the upper sheet 420 is installed, and the The lower chamber 413 formed below the upper chamber 412 to which the lower sheet 430 is installed, and the upper chamber 412 and the lower chamber 413 communicate with each other. A communication chamber 414 is narrower than 413.

In addition, one side of the upper chamber 412 is opened and closed by the lifting and lowering of the upper seat 420 communicates with the main valve unit 100 to open the third valve port (100) ( 403 is formed.

In addition, a central port 404 is formed on one side of the communication chamber 414 to communicate with the main valve unit 100 is formed.

By the actuator 400 of the present invention it is possible to operate the main valve unit 100 accurately.

First, as shown in FIG. 3, when the pressure of the gas tank 1 is in a normal range, the upper sheet 420 and the lower sheet 430 move downward in the drawing.

Therefore, the main valve 120 of the main valve unit 100 interlocked with the lower seat 430 blocks the gas inlet 1a.

In particular, since the middle port 412 is formed in the communication chamber 414, gas flows into the communication chamber 414 from the main valve unit 100.

In this case, the gas pressure moves the lower seat 430 downward in the drawing, and as a result, moves the main valve 120 of the main valve unit 100 linked with the lower seat 430 downward.

As a result, the gas inlet 1a can be stably closed.

If excessive pressure is applied through the gas inlet 1a, the upper sheet 420 and the lower sheet 430 move upward in the drawing.

In particular, the third upper port 403 communicates with the main valve unit 100 so that the main valve 120 can be moved more reliably in the upward direction on the drawing.

In other words, the gas introduced into the communication chamber 414 through the middle port 404 flows into the upper chamber 412 and then raises the main valve unit 100 through the third upper port 403. As described above, the main valve 120 can be moved more reliably in the upward direction in the drawing.

Therefore, the main valve 120 of the main valve unit 100 interlocked with the lower seat 430 moves upward to open the gas inlet 1a, so that a part of the gas flows out through the discharge passage 408. Discharged.

Of course, if excessive pressure is applied through the gas inlet 1a, the main valve 120 itself moves to the upper side.

However, when a problem occurs in the peripheral configuration of the main valve 120, there may be no response or a slow response speed of the main valve 120.

However, according to the present invention, since the main valve 120 is also linked to the pilot valve actuator 400, the actuator is operated by the actuator 400 even if there is a problem in the configuration around the main valve 120. You can expect an accurate response.

On the other hand, the shape of the communication chamber 414 side direction of the one end of the upper chamber 412 and the upper sheet 420 is formed such that the width becomes narrower toward the communication chamber 414, the lower chamber ( The shapes of both ends of the 413 and the lower sheet 430 may be formed to be narrower toward the ends.

In this case, an upper sheet contact portion 412a is formed to be inclined at a portion connected to the upper chamber 412 and the connection chamber 414 to contact the upper sheet 420.

In addition, a lower seat contact portion 413a is formed to be inclined at a portion connected to the lower chamber 413, the connection chamber 414, and the main valve unit 100, and the lower seat 430 is in close contact with the lower chamber 413.

In other words, the pilot valve actuator 400 of the present invention intercepts the port PT by raising and lowering the seat ST, and the seat ST and the housing 410 are brought into close contact for more accurate operation. desirable.

To this end, the shape of the upper sheet 420 is narrower in width toward the communication chamber 414 side direction (lower side in the drawing).

In addition, the shape of the lower end in the drawing of the upper chamber 412 in contact with the upper sheet 420 is also shaped to narrow the width.

By such a shape, the upper sheet contacting portion 412a is formed to be inclined at a portion connected to the upper chamber 412 and the connection chamber 414 to closely contact the upper sheet 420.

The same applies to the lower sheet 430 and the lower chamber 413.

Meanwhile, the upper chamber 412 is formed in one region, and further includes a first upper port 401 and a second upper port 402 that are opened only when the upper sheet 420 is lowered. The first lower port 405 which is formed in one region of the chamber 413 and is opened only when the lower sheet 430 is raised and the second lower port which is opened when the lower sheet 430 is lowered ( It is also possible to further include 406, which will be described later.

In the present embodiment, the main valve unit 100 and the pilot valve unit 200 are provided with a diaphragm.

However, the main valve unit 100 serves to control the gas inlet 1a as described above, and the pilot valve unit 200 is intended to drive the main valve unit 100. As long as the main valve unit 100 and the pilot valve unit 200 have different configurations as long as they achieve the above, it is natural that they belong to the scope of the present invention.

Example 2

In this embodiment, the pilot operated safety valve including the pilot valve actuator 400 and the male valve unit 100 and the pilot valve unit 200 to which the pilot valve actuator 400 is described above will be described. do.

In this case, the main valve unit 100 is a first chamber partitioned by the first diaphragm 113 and the first diaphragm 113 interlocked with the lower seat 430 of the pilot valve actuator 400. The main chamber 110 includes a 111 and a second chamber 112, and a main valve 120 interlocked with the first diaphragm 113.

In addition, the pilot valve unit 200 includes a pilot chamber 210 including a third chamber 211 and a fourth chamber 212 partitioned by a second diaphragm 213, and the pilot valve actuator 400. Pilot valve 230 in conjunction with the upper seat 420 of the).

In other words, the present invention is a pilot operated safety valve having a diaphragm main valve unit 100, a pilot valve unit 200, and the pilot valve actuator 400 described above.

In this case, a first pipeline 501 connecting the gas inlet 1a to which the main valve 110 communicates with the fourth chamber 212, and branches from the first pipeline 501 to the central port ( The second pipeline 502 connected to the side 404, the third pipeline 503 connecting the third upper port 403 and the second chamber 112, and the second lower port 406. And a fourth pipeline 504 connecting the first chamber 111 and a fifth pipeline 505 connecting the second upper port 402 and the first chamber 111.

In addition, the pilot valve 230 is an upper portion for interlocking the diaphragm 231 interlocked with the second diaphragm 213 and the diaphragm 231 and the upper seat 420 of the pilot valve actuator 400. And a stem shaft 232 and an elastic unit 300 for pressing and pressing the diaphragm 231.

The main chamber 110 is installed at the gas inlet (1a) of the gas tank 1, the first chamber 111 and the second chamber 112 in the up and down direction by the first diaphragm 113 It is partitioned.

Here, the gas discharged from the atmosphere or the gas tank 1 is selectively introduced into the first chamber 111, and the atmosphere or gas is selectively introduced into the second chamber 112, but the first chamber A fluid opposite to the fluid introduced into the 111 is introduced.

That is, when air flows into the first chamber 111, gas flows into the second chamber 112, and when gas flows into the first chamber 111, the air flows into the second chamber 112.

When the gas flows into one of the first and second chambers 111 and 112 and the atmosphere flows into the other, the first diaphragm 113 is autonomously displaced toward the low pressure chamber by the differential pressure between the gas and the atmosphere.

The main valve 120 is coupled to the first diaphragm 113 and interlocked with each other in the up and down directions according to the displacement of the first diaphragm 113.

The main valve 120 is installed to penetrate the bottom of the main chamber 110 while being provided at the coupling portion 121 coupled to the first diaphragm 113 and the lower portion of the coupling portion 121. The stem part 122 and the seat part 123 which are provided in the lower part of the said stem part 122 to open and close the said gas inlet 1a are comprised.

The first diaphragm 113 and the second diaphragm 213 are made of a flexible nonmetallic material.

The pilot valve unit 200 includes a pilot chamber 210, a pilot valve 220, and an elastic body 300.

The pilot chamber 210 is configured such that the third chamber 211 into which air is introduced and the fourth chamber 212 into which gas is introduced are partitioned by the second diaphragm 213.

The displacement of the diaphragm 213 and the diaphragm 231 coupled to the second diaphragm 213 toward the third chamber 211 is determined according to the gas pressure of the fourth chamber 212.

That is, when the gas pressure is low in the fourth chamber 212 and the lifting force generated by the gas pressure is smaller than the elastic force of the elastic body 300 in the compressed state, the diaphragm 231 will be located at the bottom of the displacement. When the elastic force of the elastic body 300 is higher than the lifting force generated by the gas pressure, the diaphragm 231 rises to the uppermost part of the displacement.

Here, the vertical displacement limit of the diaphragm 231 is determined by the structural dimension of the pilot valve actuator 400.

The pilot valve actuator 400 is installed below the pilot chamber 210 as described above.

At this time, the upper sheet contacting portion 412a is in contact with each other in the up and down direction through the inclined shape at the same angle as the upper sheet 420, and thus the contact area is also increased, so that an improved sealing effect can be obtained. And blocking can be performed accurately.

In addition, the packing members 420a and 430a are installed at portions where the housing 410 and the sheets ST 420 and 430 contact each other to seal the space between the interior space of the housing 410 and the sheets ST 420 and 430. .

In addition, the upper chamber 412 is opened only when the first upper port 401 and the second upper port 402 and the upper sheet 420 are opened when the upper sheet 420 is lowered. The third upper port 403 is configured.

In this case, opening of the port does not mean simply a state in which the port is not blocked, but a state in which air flows through the port. For example, in the state of FIG. 3, the third upper port 403 is not blocked but not open because the port is not directly blocked.

The communication chamber 414 is configured with a central port 404 that is always open.

The lower chamber 413 includes a first lower port 405 which is opened only when the lower sheet 430 is raised and a second lower port 406 which is opened only when the lower sheet 430 is lowered. do.

In addition, the connection passage 407 is formed at the bottom of the main chamber 110 to communicate with the first chamber 111 only when the lower sheet 430 is raised.

The pilot valve 230 includes a diaphragm 231 coupled to the second diaphragm 213 and an upper stem shaft interlocked with the upper seat 420 while being provided under the diaphragm 231. 232, and an elastic unit 300 for pressing and pressing the diaphragm 231.

At this time, the second lower port 406 is blocked when the upper seat 420 and the lower seat 430 interlocked with the pilot valve 230, and when the upper seat 420 and the lower seat 430 descend. The first lower port 405 is blocked.

In this case, as described above, the upper sheet contacting portion 412a on the lower surface of the upper sheet 420 and the lower surface of the upper chamber 412 and the lower sheet on the upper surface of the lower sheet 430 and the upper surface of the lower chamber 413. The contact portion 413a is preferably formed in a shape that can be in contact with the inclined surfaces to further improve the sealing effect.

When the sealing members 420a and 430a are installed on the outer circumferences of the upper sheet 420 and the lower sheet body 430, the sealing members 420a and 430a contact the inner surface of the housing 410 to further improve the sealing effect. You can.

On the other hand, the connection relationship between the main valve unit 100 and the pilot valve unit 200 is as follows.

As described above, the gas inlet 1a and the fourth chamber 212 are connected by the first pipeline 501.

In addition, the middle port 404 is connected by a second pipeline 502 branching from the first pipeline 501.

In addition, the third upper port 403 is connected to the second chamber 112 by a third pipeline 503.

In addition, the second lower port 406 is connected to the first chamber 111 by the fourth pipeline 504.

In addition, the second upper port 402 is connected to the second chamber 112 by the fifth pipeline 505.

The elastic unit 300 is installed in the pilot chamber 210 to press and press the pilot valve 230, one side is bound to the diaphragm 231, the other side of the pilot chamber 210 It is composed of an elastic body bound to the upper side.

Here, the elastic unit 300 is exerting an elastic force in the direction of pressing the pilot valve 230.

Hereinafter will be described the opening and closing process (opening and closing method) of the pilot operated safety bell according to the present invention.

First, when the internal pressure of the gas tank 1 is within the prescribed pressure, the internal pressure of the gas tank 1 is less than the allowable pressure as shown in FIG. 3, so that the gas inlet 1a is blocked by the main valve 120.

To this end, some of the gas is led to the fourth chamber 212 through the first pipeline 501, which is connected to the gas inlet 1a, and some gas is communicated through the second pipeline 502. Guided to chamber 414.

 However, the induced gas pressure is smaller than the pressing pressure of the elastic unit 300 because it is below the prescribed pressure.

Therefore, the pilot valve 230 supported by the elastic unit 300 is in a lowered state.

On the other hand, the gas guided to the communication chamber 414 is led to the first chamber 111 through the open second lower port 406 and the fourth pipeline 504, the upper portion in the second chamber 112 Atmosphere is induced through the first upper port 401, the second upper port 402, and the fifth pipeline 505 of the chamber C ₁ .

At this time, since the gas pressure induced in the first chamber 111 is relatively high pressure compared to the atmospheric pressure of the second chamber 112, due to the differential pressure, the gas pressure is bound to the first diaphragm 113 and the first diaphragm 113. The main valve 120 is lowered to block the gas inlet 1a.

On the other hand, when the internal pressure of the gas tank 1 is greater than or equal to the prescribed pressure, the internal pressure of the gas tank 1 is in an overpressure state, so the main valve 120 must be opened to discharge gas as much as the overpressure.

To this end, the overpressure gas is guided to the fourth chamber 212 through the first pipeline 501 connected to the gas inlet 1a.

Then, since the pressure in the fourth chamber 212 is increased, the second diaphragm 213 rises while the elastic force of the elastic unit 300 is overcome, and the pilot valve 230 also rises in conjunction with this.

As such, when the pilot valve 230 is raised, the lower port 405 and the connection passage 407 are opened, and thus air enters the first chamber 111.

In addition, since the third upper port 403 is also open, the overpressure gas introduced into the communication chamber 414 through the second pipeline 502 and the middle port 404 is transferred to the third upper port 403 and the third pipe. Final entry into the second chamber 112 via line 503.

Accordingly, the gas inlet 1a is opened by lifting the main valve 120 while the internal pressure of the second chamber 112 is increased, and the overpressure gas inside the gas tank 1 is discharged through the open gas inlet. Through 408.

When the discharge of the overpressure gas is completed through this process and the pressure of the gas tank 1 becomes less than the prescribed pressure, the gas inlet 1a described above is switched to the initial state.

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

1: gas tank 1a: gas inlet
100: main valve unit 110: main chamber
111: first chamber 112: second chamber
113: first diaphragm 120: main valve
200: pilot valve unit 210: pilot chamber
211: third chamber 212: fourth chamber
213: second diaphragm 220: valve housing
230: pilot valve 300: elastic unit
400: pilot valve actuator 410: housing
420: upper sheet 430: lower sheet
401: first upper port 402: second upper port
403: third upper port 404: middle port
405: second lower port 406: lower port
407: connection euro
408: discharge passage 501: first pipeline
502 second pipeline 503 third pipeline
504: fourth pipeline 505: fifth pipeline

Claims (8)

delete As a filer valve actuator 400 which defines the operating relationship between the main valve unit 100 and the pilot valve unit 200,
The pilot valve actuator 400 moves up and down in conjunction with the main valve unit 100, and moves up and down in conjunction with the pilot valve unit 200, and thus an upper portion of the lower seat 430. A seat stem 440 connecting the upper sheet 420 and the lower sheet 430 and the upper sheet 420, and the upper and lower sheets 420 and 430 and the sheet stem 440, respectively, It includes a housing 410 in communication with the valve unit 100 or the pilot valve unit 200,
The housing 410 has a housing main body 411 having a constant cross section, an upper chamber 412 formed with an empty space inside the housing main body 411, and equipped with the upper sheet 420, and the upper chamber. A lower chamber 413 formed below the lower chamber 430 to which the lower sheet 430 is installed, and the upper chamber 412 and the lower chamber 413 communicate with each other, so that the upper chamber 412 and the lower chamber 413 communicate with each other. A communication chamber 414 narrower than
One side of the upper chamber 412 is opened and closed by the lifting and lowering of the upper seat 420 is in communication with the main valve unit 100 to open the third upper port 403 to open the main valve unit 100 Wow,
Pilot valve actuator, characterized in that formed in one side of the communication chamber 414, the central port (404) is in communication with the main valve unit (100). The method of claim 2,
The shape of the communication chamber 414 side of the upper end of the upper chamber 412 and the upper sheet 420 is formed to become narrower toward the communication chamber 414,
Shapes of both ends of the lower chamber 413 and the lower sheet 430 are formed to be narrower in the direction toward the end,
An upper sheet contact portion 412a is formed to be inclined at a portion connected to the upper chamber 412 and the connection chamber 414 to contact the upper sheet 420.
A lower seat contact portion 413a which is formed to be inclined at a portion connected to the lower chamber 413, the connection chamber 414, and the main valve unit 100 to be in close contact with the lower seat 430. Valve actuator The method of claim 2,
The third upper port 403 is formed in one region of the upper chamber 412, and is opened only when the upper seat 420 is raised, while communicating with the main valve unit 100 to communicate with the lower seat. 430 and move the upper sheet 420 linked thereto,
The central port (404) is formed on one side of the communication chamber (414) pilot valve actuator, characterized in that in communication with the main valve unit (100). 5. The method of claim 4,
It is formed in one area of the upper chamber 412, and further includes a first upper port 401 and a second upper port 402 which is opened only when the upper sheet 420 is lowered,
The lower chamber 413 is formed in one region, and the first lower port 405 which is opened only when the lower sheet 430 is raised and the second lower opening which is opened only when the lower sheet 430 is lowered are provided. And a port (406). Pilot operated safety comprising a pilot valve actuator 400 according to any one of claims 2 to 5 and a male valve unit 100 and a pilot valve unit 200 to which the pilot valve actuator 400 is interposed. As a valve,
The main valve unit 100 includes a first diaphragm 113 interlocked with the lower seat 430 of the pilot valve actuator 400 and a first chamber 111 partitioned by the first diaphragm 113. ) And a main chamber 110 including a second chamber 112 and a main valve 120 interlocked with the first diaphragm 113.
The pilot valve unit 200 includes a pilot chamber 210 including a third chamber 211 and a fourth chamber 212 partitioned by a second diaphragm 213, and the pilot valve actuator 400. Pilot operated safety valve including a pilot valve actuator, characterized in that it comprises a pilot valve 230 in conjunction with the upper seat (420). The method according to claim 6,
A first pipeline 501 connecting the gas inlet 1a to which the main valve 110 communicates with the fourth chamber 212;
A second pipeline 502 branched from the first pipeline 501 and connected to the central port 404 side;
A third pipeline 503 connecting the third upper port 403 and the second chamber 112,
A fourth pipeline 504 connecting the second lower port 406 and the first chamber 111;
Pilot operated safety valve including a pilot valve actuator further comprises a fifth pipeline (505) connecting the second upper port (402) and the first chamber (111). The method according to claim 6,
The pilot valve 230 is a diaphragm 231 interlocked with the second diaphragm 213,
An upper stem shaft 232 for interlocking the diaphragm 231 and the upper seat 420 of the pilot valve actuator 400 with each other;
Pilot operated safety valve including a pilot valve actuator, characterized in that it comprises an elastic unit 300 for pressing and pressing the diaphragm (231).

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