JP2007162763A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce loads on piping, a gas appliance and the like on the downstream side by preventing high pressure gas from flowing out to an outlet passage rapidly and preventing heat generation due to adiabatic compression. <P>SOLUTION: A shut-off valve seat (14) is formed on the periphery of an outlet passage (12) opening to a shut-off valve chamber (11). A shut-off member (15) is composed of a first shut-off member (16) and a second shut-off member (17), and the first shut-off member (16) is made to come in contact with/separate from the shut-off valve seat (14). A communication passage (18) with a small passage cross sectional area is formed in the first shut-off member (16). An end of the communication passage (18) faces the outlet passage (12), and a second valve seat (19) is formed on the other end thereof to make a second shut-off member (17) come into contact with/separate from the second valve seat (19). A working shaft (20) is extendingly provided from the second shut-off member (17), and a piston member (27) is formed on the tip end thrusted into a working chamber (24). The first shut-off member (16) is made to travel with the second shut-off member (17) at a position separated from the second valve seat (19). A pressure-receiving chamber (28) is demarcated by a piston member (27) in the working chamber (24), and a working fluid is introduced. The shut-off member (15) is urged to the shut-off valve seat (14) side by a valve closing spring (30). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a valve device used for controlling a high-pressure gas such as hydrogen gas. More specifically, the high-pressure gas is prevented from rapidly flowing out to an outlet passage, thereby preventing heat generation due to adiabatic compression, The present invention relates to a valve device that can reduce the burden on piping and gas equipment.

  In recent years, development of vehicles using hydrogen gas, which is less polluting the environment, as a fuel has been promoted. The hydrogen gas storage container is desired to have a large capacity and a small size, and therefore, the storage gas pressure is also required to be increased to a high pressure such as 70 MPa.

Some conventional high-pressure gas valve devices remotely operate the valve using a working fluid such as compressed air or pressurized oil (see, for example, Patent Document 1).
In this valve device, an inlet passage, a closing valve chamber, and an outlet passage are formed in the housing in order. A closing valve seat is formed in the closing valve chamber, and the valve device is opened and closed by inserting a closing member into the closing valve chamber and moving the closing member forward and backward with respect to the closing valve seat.

  In the housing, a working chamber is formed in the vicinity of the shut-off valve chamber, and an insertion hole is formed in a portion of the partition wall between the working chamber and the shut-off valve chamber facing the shut-off valve seat. An operating shaft that is transparently provided and extends from the closing member to the side opposite to the closing valve seat is inserted into the insertion hole so as to be slidable. The distal end of the operating shaft projects into the working chamber, and the piston member formed at the distal end is configured to be slidable on the inner surface of the working chamber. The working chamber is defined by the piston member, and a pressure receiving chamber is formed on the closing valve chamber side. A working fluid introduction path is connected to the pressure receiving chamber so that the working fluid can be introduced into the pressure receiving chamber. is there. A valve closing spring, which is a valve closing urging means, is inserted into the working chamber, and the valve closing spring urges the closing member toward the valve closing seat via the piston member.

  When the working fluid is introduced into the pressure receiving chamber, the piston member is pushed and moved toward the valve opening side against the urging force of the valve closing spring, so that the closing member is separated from the valve closing seat. The valve device is opened, and the high-pressure gas that has flowed from the inlet passage into the closing valve chamber is taken out to the outlet passage.

  At this time, when the high-pressure gas flowing in from the inlet passage rapidly flows into the outlet passage, adiabatic compression occurs, resulting in a high temperature, and the resin parts such as the filter and the valve seat are melted by heat or thermally decomposed into fine powder. Cause various problems. In addition, there is a problem that a large burden due to a sudden rise in pressure is applied to piping connected to the downstream side of the valve device, other valve devices, gas equipment, and the like. For this reason, it is necessary to open the valve device slowly. In the prior art described above, the working fluid is introduced into the pressure receiving chamber by providing an orifice in the working fluid introduction path and providing resistance to the flow of the working fluid. So that it slowly flows into

Japanese Patent Laid-Open No. 11-30399

  However, in order to ensure the gas flow rate in the normal state, the inlet passage and the outlet passage have a wide passage cross-sectional area. Therefore, in the above-described prior art, even if the closing member is slightly separated from the closing valve seat. The opening area will spread rapidly. In particular, in the case of a gas having a small molecular weight such as hydrogen, a large amount of gas flows out from a small gap, so that the high-pressure gas tends to flow out rapidly to the outlet channel only by limiting the inflow speed of the working fluid as described above. For this reason, in this conventional valve device, there is a problem that it is not easy to prevent heat generation due to adiabatic compression and to reduce the burden on gas equipment on the downstream side.

  The technical problem of the present invention is to solve the above-mentioned problems, prevent high-pressure gas from rapidly flowing into the outlet passage, prevent heat generation due to adiabatic compression, and burden on downstream piping and gas equipment. An object of the present invention is to provide a valve device that can be reduced.

In order to solve the above-described problems, the present invention is configured as follows, for example, based on FIGS. 1 to 5 showing an embodiment of the present invention.
That is, the present invention relates to a valve device, wherein an inlet passage (9), a closing valve chamber (11) and an outlet passage (12) are formed in order in a housing (2, 2a), and the closing valve chamber (11) has a closing valve. A seat (14) is formed, and a closing member (15) is inserted into the closing valve chamber (11) so as to be able to advance and retreat with respect to the closing valve seat (14), and an operating chamber (24 Of the partition wall (25) between the working chamber (24) and the closing valve chamber (11), and the insertion hole (26) in the portion facing the closing valve seat (14). The operating shaft (20) extending from the closing member (15) to the opposite side of the closing valve seat (14) is inserted into the insertion hole (26) so as to be slidably closed, and A piston member (27) is formed at the tip of the operating shaft (20) that has entered the working chamber (24), and the piston member (27) is configured to be slidably sealed on the inner surface of the working chamber (24). Thus, the piston member (27) forms a pressure receiving chamber (28) on the side of the shut-off valve chamber (11) in the working chamber (24). The working fluid introduction path (31) is connected to the pressure receiving chamber (28) so that the working fluid can be introduced into the pressure receiving chamber (28), and the closing valve chamber (11) applied to the working shaft (20) is configured. A valve device provided with valve closing biasing means (30) for biasing the closing member (15) toward the closing valve seat (14) against the gas pressure in
The closing valve seat (14) is formed around the upstream opening end of the outlet passage (12) that opens to the closing valve chamber (11), and the closing member (15) is connected to the first closing member (16). ) And a second closing member (17), and the first closing member (16) is configured to be able to contact and separate from the closing valve seat (14). The communication passage (18) having a smaller passage cross-sectional area than the outlet passage (12) is formed, one end of the communication passage (18) faces the outlet passage (12), and the other end is connected to the second passage. A second valve seat (19) having a sealing area smaller than that of the above-mentioned closing valve seat (14) is formed around the other end so as to face the closing member (17), and the above-mentioned second closing member (17) Is configured to be movable toward and away from the second valve seat (19), and the operating shaft (20) is extended to the second closing member (17) so that the second closing member (17) 2 The first closing member 17 is closed at a position separated from the valve seat 19 by a predetermined distance. The member (16) is linked so that it can move in the valve opening direction, and the pressure of the working fluid flowing into the pressure receiving chamber (28) is controlled by the second closing member (17). The internal pressure of the outlet passage (12) and the closing valve chamber (11) are not less than a value that moves in the valve opening direction against the urging force of (30) and until the inside of the outlet passage (12) reaches a predetermined pressure. The first closing member (16) is set to be equal to or less than a value at which the first closing member (16) is held in a closed posture by a differential pressure with respect to the internal gas pressure.

  When the pressure of the working fluid is not applied to the pressure receiving chamber, the first closing member and the second closing member are urged toward the closing valve seat by the valve closing urging means. Yes. The operating shaft is subjected to a pressing force in the valve opening direction by the high-pressure gas in the shut-off valve chamber on the seal cross-sectional area. However, the urging force by the valve closing urging means is set to be larger than the pressing force in the valve opening direction by the high pressure gas, whereby both the closing members move to the closing valve seat side and the first closing The member comes into contact with the closing valve seat and the second closing member comes into contact with the second valve seat, and the communication between the closing valve chamber and the outlet passage is blocked.

  When a working fluid such as compressed air or pressurized oil flows from the working fluid introduction passage into the pressure receiving chamber, the pressure causes the piston member to open in the valve opening direction against the urging force of the valve closing urging means. Pressed. At this time, the pressure of the working fluid is not less than the value at which the second closing member moves in the valve opening direction against the urging force of the valve closing urging means. Therefore, the second closing member moves in the valve opening direction. It moves away from the second valve seat and communicates with the outlet passage through the communication passage formed in the first closing member in the closing valve chamber. The second closing member is linked to the first closing member at a position separated from the second valve seat by a predetermined dimension, and the first closing member can be moved together. However, the first closing member is pressed against the closing valve seat by the differential pressure between the gas pressure in the closing valve chamber and the internal pressure in the outlet passage, and the pressure of the working fluid in the pressure receiving chamber is increased by the differential pressure. Since the first closing member is set to be equal to or less than a value at which the closing member is held in the closing posture, the first closing member is maintained in the valve closing posture in contact with the closing valve seat. Therefore, this shut-off valve chamber is maintained in a semi-open state, in which only the above-mentioned communication passage communicates with the exit passage. leak.

  When the high-pressure gas flows out to the outlet passage at a small flow rate, the gas pressure in the outlet passage gradually increases, and the differential pressure from the gas pressure in the shut-off valve chamber is reduced. When the gas pressure in the outlet passage reaches a predetermined pressure, the first hydraulic fluid pressure in the pressure receiving chamber is set to the first pressure against the gas pressure in the closing valve chamber that holds the first closing member in the closing posture. The closing member moves together with the second closing member in the valve opening direction and is separated from the closing valve seat. As a result, the shut-off valve chamber is in a fully open state, and the high-pressure gas in the shut-off valve chamber flows out to the outlet passage at a normal flow rate.

  The valve closing urging means can move the closing member toward the closing valve seat against the gas pressure in the closing valve chamber applied to the operating shaft in a state where the pressure of the working fluid is not applied to the pressure receiving chamber. However, it is not limited to a specific structure, but it is preferable to use a valve closing spring because the closing member can be reliably urged in the valve closing direction. Moreover, since the piston member accommodated in said working chamber receives the pressure of said working fluid in a wide area, it is formed in a larger diameter than a closing member, for example. Therefore, when the valve closing spring is accommodated in the working chamber so as to urge the closing member via the piston member, it is easy to mount even a large spring having a strong elastic force. Yes, it is preferable.

  The above-mentioned closing member can be manually opened so that it can be opened even in situations where the working fluid cannot be procured, such as when used in places where working fluid cannot be supplied, or when a device that supplies the working fluid fails. It is preferable to provide a forced valve opening jig. Specifically, for example, a manually operated forced valve opening jig is detachably connected to the opposite side of the piston member from the pressure receiving chamber. Further, the forced valve opening jig and its connection are not limited to a specific configuration, for example, a jig insertion hole is formed on the opposite side of the pressure receiving chamber in the working chamber, and the jig insertion hole is inserted through the jig insertion hole. The forced valve opening jig can be configured to be connected to the piston member.

Since the present invention is configured and operates as described above, the following effects can be obtained.
When the working fluid is allowed to flow into the pressure receiving chamber during the valve opening operation, the second closing member is opened by the pressure, but the first closing member is maintained in the valve closing posture in contact with the closing valve seat. In other words, since it is in a half-open state, high-pressure gas can be made to flow out to the outlet passage little by little through the communication passage formed in the first closing member. That is, in a normal state after the valve is opened, the high pressure gas flows out to the outlet passage at a normal flow rate, but when the valve is opened, the high pressure gas is closed according to the cross-sectional area of the communication passage. Since it is made to flow out gradually from a valve room to an exit way, it can prevent that this high pressure gas flows out to an exit way rapidly. As a result, since the gas pressure in the outlet passage does not rise rapidly, heat generation due to adiabatic compression can be prevented, and the burden on the downstream piping and gas equipment can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of the present invention, FIG. 1 is a sectional view of a valve device in a closed state, FIG. 2 is an enlarged sectional view in the vicinity of a closed valve chamber in the closed state, and FIG. FIG. 4 is an enlarged cross-sectional view of the vicinity of the closing valve chamber in the fully open state, FIG. 4 is an enlarged cross-sectional view of the vicinity of the closing valve chamber in the fully open state, and FIG. 5 is a cross-sectional view of the vicinity of the forced valve opening jig for explaining the manual valve opening operation. It is.

  As shown in FIG. 1, this valve device (1) has a leg screw part (4) connected to a gas container (3) at the lower part of a main body housing (2), and an outlet nozzle (5) on one side. The remote control opening / closing operation part (6) is provided on the other side. A gas inlet (7) is opened on the lower surface of the leg screw part (4) so as to face the gas storage space (3a) of the gas container (3), and on the end face of the outlet nozzle (5). The gas outlet (8) is open.

  In the main body housing (2), the inlet passage (9) and the closing valve chamber (11) of the closing valve (10) and the outlet passage (between the gas inlet (7) and the gas outlet (8) ( 12) are formed in order. A gas escape passage (13) branches off from the inlet passage (9), and a safety valve (not shown) is attached to the gas escape passage (13). In the above-described closing valve chamber (11), a closing valve seat (14) is formed around the upstream opening end of the outlet passage (12) opening to the closing valve chamber (11). A closing member (15) is inserted into the closing valve chamber (11) so as to be movable forward and backward with respect to the closing valve seat (14).

  As shown in FIGS. 1 and 2, the closing member (15) is composed of a first closing member (16) and a second closing member (17) arranged in order from the closing valve seat (14) side. is there. The first closing member (16) is configured to be able to contact and separate from the closing valve seat, and the first closing member (16) has a communication passage (18) having a passage cross-sectional area smaller than that of the outlet passage (12). It is transparent. The communication path (18) has one end facing the outlet passage (12) and the other end facing the second closing member (17), and the closing valve is disposed around the other end. A second valve seat (19) having a smaller sealing area than the seat (14) is formed. As shown in FIG. 2, the first closing member (16) contacts the closing valve seat (14), and the second closing member (17) contacts the second valve seat (19). A closed valve state (X) is established in which the communication between the valve chamber (11) and the outlet channel (12) is blocked.

  An operating shaft (20) extends from the second closing member (17) to the side opposite to the closing valve seat (14). Further, the second closing member (17) is provided with an engaging pin (21), and the engaging pin (21) is inserted into the engaging hole (22) provided in the first closing member (16). Inserted. As a result, when the second closing member (17) is separated from the second valve seat (19) by a predetermined dimension and the engaging pin (21) is received by the end of the engaging hole (22), the first closing member (17) is received. The closing member (16) can move in the valve opening direction in association with the second closing member (17).

  A cylindrical member (23) is tightly fixed to a portion of the peripheral wall of the closing valve chamber (11) facing the closing valve seat (14), and the outer side of the cylindrical member (23) Is provided with an operating part housing (2a) of the remote control opening / closing operating part (6). A working chamber (24) is formed in the working portion housing (2a), and the cylinder member is provided in a partition wall (25) between the working chamber (24) and the shut-off valve chamber (11). (23) An insertion hole (26) connected to the inside is formed. The operating shaft (20) is inserted into the insertion hole (26) so as to be slidable and the tip of the operating shaft (20) is inserted into the working chamber (24).

  A piston member (27) that slides tightly on the inner surface of the working chamber (24) is fixed to the tip of the working shaft (20), and the working chamber (24) is closed by the piston member (27). A pressure receiving chamber (28) on the valve chamber (11) side and a spring accommodating chamber (29) on the opposite side are partitioned. This spring accommodating chamber (29) accommodates a valve closing spring (30) as a valve closing urging means, and both the above-mentioned closing members (16, 16) via a piston member (27) and an operating shaft (20). 17) is biased toward the closing valve seat (14). In addition, a working fluid introduction path (31) is formed in the working part housing (2a), and the pressure receiving chamber (28) is supplied with a pressure fluid not shown through the working fluid introduction path (31). It communicates with the device.

  A cylindrical stopper (32) is screwed and fixed to the peripheral wall of the spring accommodating chamber (29) at a position facing the substantially central portion of the piston member (27). By moving the stopper (32) forward to the piston member (27) side, the closing member (15) is held in the valve-closed position via the operating shaft (20). The high pressure gas is prevented from flowing out from the shut-off valve chamber (11) to the outlet passage (12) when the working fluid flows into the pressure receiving chamber (28) by mistake. Then, by retracting the stopper (32) from the working chamber (24), the stroke of the piston member (27) and the closing member (15) is secured. A jig insertion hole (33) is formed through the stopper (32), and the piston member (27) is connected to the jig insertion hole (33) on the side opposite to the pressure receiving chamber (28). A jig mounting part (34) is formed at the facing part.

Next, the opening / closing operation of the valve device will be described with reference to FIGS. 1 and 2 to 4.
In the valve closed state (X) shown in FIG. 2, the pressure of the working fluid is not applied to the pressure receiving chamber (28), and the first closing member (16) and the second closing member (17) described above. Is biased toward the closing valve seat (14) by the elastic pressure of the valve closing spring (30). The elastic pressure of the valve closing spring (30) is set to be larger than the force with which the high pressure gas in the valve closing chamber (11) presses the operating shaft (20) in the valve opening direction. As a result, both the closing shafts (16, 17) together with the operating shaft (20) are urged by the elastic pressure of the valve closing spring (30) to move toward the closing valve seat (14), and the first closing member. (16) contacts the closing valve seat (14) and the second closing member (17) contacts the second valve seat (19), so that the closing valve chamber (11) is closed (X). Retained.

  When a working fluid such as compressed air or pressurized oil is supplied from the working fluid introduction path (31) to the pressure receiving chamber (28) by the pressure fluid supply device (not shown) from the valve closed state (X), The piston member (27) is pressed in the valve opening direction against the urging force of the valve closing spring (30).

  At this time, the pressure of the working fluid is set to be equal to or greater than the value at which the second closing member (17) moves in the valve opening direction against the urging force of the valve closing spring (30). That is, in the valve closing state (X), the elastic pressure in the valve closing direction by the valve closing spring (30) and the gas pressure in the valve closing chamber (11) added to the sealing area of the second valve seat (19). The sum of the pressing force in the valve closing direction due to the pressure and the pressing force in the valve opening direction due to the gas pressure in the closing valve chamber (11) added to the seal cross-sectional area of the operating shaft (20) in the valve closing direction. Pressure is applied to the piston member (27). The pressure of the working fluid is set to be equal to or higher than the pressure that can move the piston member (27) to the valve opening side against the sum of the pressing forces in the valve closing direction.

  As a result, the piston member (27) moves in the valve opening direction due to the pressure of the working fluid, and the second closing member (17) moves in the valve opening direction together with the operating shaft (20). Separated from the second valve seat (19) formed in (16). Accordingly, the inside of the shut-off valve chamber (11) communicates with the outlet passage (12) via the communication passage (18) formed in the first closing member (16), and the half-open state (Y) shown in FIG. Become.

  When the second closing member (17) is separated from the second valve seat (19) by a predetermined dimension, the engaging pin (21) is received by the end of the engaging hole (22), and the first closing member ( 16) is linked to the second closing member (17) and can be moved in the valve opening direction. However, the pressure of the working fluid in the pressure receiving chamber (28) is set to be equal to or less than a value at which the first closing member (16) is held in the closed posture.

  That is, the first closing member (16) has a pressure difference between the gas pressure in the closing valve chamber (11) and the inner pressure in the outlet passage (12) according to the seal area of the closing valve seat (14). It is pressed against the closing valve seat (14), and this pressing force in the closing direction is added to the pressing force in the closing direction applied to the operating shaft (20) and the second closing member (17). Then, the working fluid becomes larger than the pressing force for moving the piston member (27) to the valve opening side.

  As a result, the first closing member (16) does not move from the state in contact with the closing valve seat (14), and the closing valve chamber (11) has only the communication path (18) as shown in FIG. A semi-open state (Y) is maintained, which communicates with the outlet channel (12) via. Therefore, the high-pressure gas in the shut-off valve chamber (11) flows out to the outlet passage (12) with a small gas flow rate corresponding to the cross-sectional area of the communication passage (18).

  When the outflow of high-pressure gas from the communication passage (18) continues, the internal pressure of the outlet passage (12) gradually increases, and at the same time, the gas pressure in the closing valve chamber (11) and the outlet passage (12 ), The pressing force for pressing the first closing member (16) toward the closing valve seat (14) side is reduced. When the gas pressure in the outlet passage (12) reaches a predetermined pressure, the pressing force in the valve closing direction due to the differential pressure is sufficiently reduced, and this pressing force is applied to the operating shaft (20). Even if added to the pressing force in the valve closing direction applied to the second closing member (17), the working fluid becomes smaller than the pressing force for moving the piston member (27) to the valve opening side.

  As a result, the pressing force of the working fluid causes the first closing member (16) to accompany the second closing member (17) and move in the valve opening direction, and is separated from the closing valve seat (14). The fully open state (Z) shown in FIG. Therefore, the high-pressure gas in the closing valve chamber (11) flows out from the gap between the first closing member (16) and the closing valve seat (14) into the outlet passage (12) at a normal flow rate.

  When the valve device (1) is closed from the fully opened state (Z), the pressure of the working fluid in the pressure receiving chamber (28) is released. Thus, against the gas pressure in the closing valve chamber (11) applied to the operating shaft (20), the piston member (27) moves to the valve closing side by the elastic pressure of the valve closing spring (30), and the first The valve closing state (X) shown in FIG. 2 is established, in which the first closing member (16) is in contact with the closing valve seat (14) and the second closing member (17) is in contact with the second valve seat (19).

  The valve device (1) may not be able to connect the working fluid introduction path (31) to the pressure fluid supply device depending on the location of the gas container (3). Even if it can be connected to the apparatus, if it fails, the working fluid cannot be supplied to the pressure receiving chamber (28). In these cases, as shown in FIG. 5, a forced valve opening jig (35) is attached to the valve device (1).

  That is, the forced valve opening jig (35) is attached to an attachment shaft portion (37) having a locking portion (36) at one end and the other end of the attachment shaft portion (37) to be freely rotatable. It comprises an L-shaped operating lever (38) and a cradle (40) having a through hole (39) through which the mounting shaft portion (37) can be inserted.

  As shown in FIG. 5, the cradle (40) is attached to the outer surface of the operating part housing (2a), and the mounting shaft part (37) is inserted into the jig insertion hole (33). The locking portion (36) is screwed and fixed to the jig mounting portion (34). Then, when the operation lever (38) is rotated counterclockwise in FIG. 5, the piston member (27) together with the operating shaft (20) is elastically pressed by the valve closing spring (30) according to the lever principle. The first closing member (16) and the second closing member (17) are attracted to the spring accommodating chamber (29) side against the force, whereby the closing valve seat (14) and the second valve seat (19), respectively. To the fully open state (Z) shown in FIG.

  When the operation lever (38) is rotated clockwise and returned, the piston member (27) moves together with the operating shaft (20) toward the closing valve chamber (11) due to the elastic force of the valve closing spring (30). Accordingly, the first closing member (16) and the second closing member (17) are switched to the valve closing state (X) shown in FIG.

  The valve device described in the above embodiment is exemplified to embody the technical idea of the present invention, and includes a housing, a closing valve chamber, a closing member, an operating shaft, a remote-operating opening / closing operation unit, and a piston member. The shape, structure, formation position, and the like are not limited to this embodiment, and various modifications can be made within the scope of the claims of the present invention.

  For example, in the above embodiment, the operating part housing is formed separately from the main body housing and fixed to the main body housing. However, in the present invention, these may be integrally formed. Further, in the above embodiment, the safety valve is provided by branching the gas escape path to the inlet path. However, the escape path and the safety valve can be omitted. In addition, a closing valve that can be manually opened and closed can be provided in the inlet passage, and the manual closing valve is closed in the event that the remote operation opening and closing operation unit should malfunction or be maintained. You may comprise so that gas extraction can be stopped compulsorily by operating. In addition, it cannot be overemphasized that the gas handled by the valve apparatus of this invention is not limited to a specific kind.

  The valve device according to the present invention prevents high-pressure gas from rapidly flowing out to the outlet passage, thereby preventing heat generation due to adiabatic compression and reducing the burden on downstream piping and gas equipment. It is particularly suitable for container valves that handle high-pressure gas containing flammable gas such as hydrogen gas and that can be opened and closed remotely, but it is also suitable for other gas container valve devices and piping valve devices. .

It is sectional drawing of the valve apparatus of a valve closing state which shows embodiment of this invention. It is an expanded sectional view near a closing valve room in a closed state of an embodiment of the present invention. It is an expanded sectional view near a shut-off valve room in a half open state of an embodiment of the present invention. It is an expanded sectional view of the vicinity of a shut-off valve chamber in a full open state of an embodiment of the present invention. It is sectional drawing of the forced valve opening jig vicinity attached to the opening / closing operation part for remote operation of embodiment of this invention.

Explanation of symbols

1 ... Valve device 2 ... Main body housing
2a ... Actuator housing 9 ... Inlet passage
11 ... Closed valve chamber
12 ... Exit road
14 ... Close valve seat
15 ... Closing member
16 ... 1st closing member
17 ... second closing member
18 ... Communication passage
19 ... Second valve seat
20 ... Operating shaft
24 ... Working room
25: Bulkhead between the working chamber (24) and the shut-off valve chamber (11)
26 ... insertion hole
27 ... Piston member
28 ... Pressure receiving chamber
30 ... Valve closing biasing means (valve closing spring)
31 ... Working fluid introduction path
33… Jig insertion hole
35 ... Forced valve opening jig

Claims (5)

An inlet passage (9), a closing valve chamber (11), and an outlet passage (12) are formed in the housing (2, 2a) in this order, and a closing valve seat (14) is formed in the closing valve chamber (11). A closing member (15) is inserted into the closing valve chamber (11) so as to be able to advance and retract relative to the closing valve seat (14).
A working chamber (24) is formed in the housing (2, 2a), and the shut-off valve seat in the partition wall (25) between the working chamber (24) and the shut-off valve chamber (11). An insertion hole (26) is formed through the part facing (14), and the operating shaft (20) extending from the closing member (15) to the side opposite to the closing valve seat (14) is provided in the insertion hole. (26) to be slidably inserted,
A piston member (27) is formed at the tip of the working shaft (20) that has entered the working chamber (24), and the piston member (27) is configured to be slidably sealed on the inner surface of the working chamber (24). The piston member (27) defines a pressure receiving chamber (28) on the side of the closing valve chamber (11) in the working chamber (24), and the working fluid introduction path (31) is formed in the pressure receiving chamber (28). Connected and configured to be able to introduce working fluid into this pressure receiving chamber (28),
Valve closing biasing means (30) for biasing the closing member (15) toward the closing valve seat (14) against the gas pressure in the closing valve chamber (11) applied to the operating shaft (20). ) Provided with a valve device,
The closing valve seat (14) is formed around the upstream opening end of the outlet passage (12) that opens to the closing valve chamber (11),
The closing member (15) comprises a first closing member (16) and a second closing member (17), and the first closing member (16) can be contacted and separated from the closing valve seat (14). To configure
The first closing member (16) is formed with a communication passage (18) having a passage cross-sectional area smaller than that of the outlet passage (12), and one end of the communication passage (18) faces the outlet passage (12). In addition, the other end faces the second closing member (17), and the second valve seat (19) having a smaller sealing area than the closing valve seat (14) is formed around the other end. ,
The second closing member (17) is configured to be movable toward and away from the second valve seat (19), and the operating shaft (20) is extended to the second closing member (17).
At the position where the second closing member (17) is separated from the second valve seat (19) by a predetermined dimension, the first closing member (16) is linked to the second closing member (17) to open the valve. Configured to be able to accompany
The pressure of the working fluid flowing into the pressure receiving chamber (28) is not less than the value at which the second closing member (17) moves in the valve opening direction against the urging force of the valve closing urging means (30). In addition, until the inside of the outlet passage (12) reaches a predetermined pressure, the first closing member (16) is caused by the differential pressure between the internal pressure of the outlet passage (12) and the gas pressure in the closing valve chamber (11). A valve device, wherein the valve device is set to be equal to or less than a value held in a closed posture.   The valve device according to claim 1, wherein the valve closing urging means (30) comprises a valve closing spring.   The valve closing spring (30) is accommodated on the side of the working chamber (24) opposite to the pressure receiving chamber (28), and the second closing member (16) is interposed via the piston member (27). The valve device according to claim 2, wherein the valve device is repressed in the valve closing direction.   The forced valve opening jig (35) operated manually is detachably connected to the opposite side to the pressure receiving chamber (28) of the piston member (27), according to any one of claims 1 to 3. Valve device.   A jig insertion hole (33) is formed on the side opposite to the pressure receiving chamber (28) in the working chamber (24), and the forced valve opening jig (35) is formed through the jig insertion hole (33). The valve device according to claim 4, wherein the valve member is connected to the piston member (27).

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