JP2008240765A - Shut-off valve and manifold valve for refrigerant pouring provided with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a vacuum pump, a vacuum gauge or the like by suppressing flowing-in of a high pressure gas to a vacuum pump side while allowing suction by the vacuum pump. <P>SOLUTION: An inlet passage (27), a shut-off valve chamber (28) and an outlet passage (29) are successively formed in a valve box (26), and a valve seat (32) is formed in the shut-off valve chamber (28). A shut-off member (33) is advanceably/retreatably inserted into the shut-off valve chamber (28) and is urged to the valve seat (32) side by a gas pressure in the shut-off valve chamber (28). A valve-opening operation chamber (30) is formed in the valve box (26), and a piston member (35) is seal-retainingly and slidably inserted. An atmospheric chamber (36) is formed at one side of the piston member (35), and a negative pressure chamber (37) communicated with the outlet passage (29) is formed at the other side. The piston member (35) is urged by pressure difference of an atmospheric pressure in the atmospheric chamber (36) and a negative pressure in the negative pressure chamber (37). The piston member (35) is cooperated with the shut-off member (33) and when a gas flowing-in from the inlet passage (27) to the shut-off valve chamber (28) is a set pressure or less, the shut-off member (33) is left from the valve seat (32) by movement of the piston member (35). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shutoff valve attached to a flow path evacuated by a vacuum pump, and a refrigerant injection manifold valve equipped with the shutoff valve. More specifically, the suction to the vacuum pump is allowed while allowing suction by the vacuum pump. The present invention relates to a shut-off valve and a refrigerant injection manifold valve equipped with the shut-off valve that can prevent inflow of high-pressure gas and protect a vacuum pump, a vacuum gauge, and the like.

  When the refrigerant gas is injected into the refrigerant-using device such as an air conditioner, a refrigerant gas supply source such as a gas cylinder is connected to the refrigerant-using device via a gas supply path. However, refrigerant-use equipment shipped from the manufacturing factory is usually filled with an inert gas such as nitrogen gas. For this reason, prior to the injection of the refrigerant gas, it is necessary to exclude air remaining in the gas supply path and gas remaining in the refrigerant-using device. Conventionally, in order to exhaust these air and gas, there is a refrigerant injection manifold valve disposed in the middle of the gas supply path, and a vacuum pump connected to the refrigerant injection manifold valve (for example, Patent Documents). 1).

  That is, this prior art refrigerant injection manifold valve includes an apparatus connection port, an injection port, and a suction port on the outer surface of the main body housing. In the main body housing, a gas supply path that communicates the device connection port with the injection port and a vacuum suction path that communicates the device connection port with the suction port are formed. Then, a refrigerant using device is connected to the device connection port of the refrigerant injection manifold valve, a gas cylinder as a refrigerant gas supply source is connected to the injection port, and a vacuum pump is connected to the suction port.

The refrigerant injection manifold valve is operated as follows.
First, the container valve of the gas cylinder is closed, and the vacuum pump is driven to evacuate in a state where the refrigerant using device, the gas supply path, and the suction port are in communication with each other. Air remaining in the flow path between the container valve and the container valve is removed. Next, the on-off valve provided in the vacuum suction path of the refrigerant injection manifold valve is closed, and the container valve of the gas cylinder is opened to inject the refrigerant gas into the refrigerant using device through the gas supply path.

Japanese Patent Laid-Open No. 2001-324097

  Since the vacuum suction path of the refrigerant injection manifold valve communicates with the device connection port, it communicates with the injection port via the gas supply path. For this reason, after the evacuation process is completed, when the refrigerant gas is supplied from the gas cylinder while the open / close valve provided in the vacuum suction path is opened, the refrigerant gas is supplied to the vacuum pump via the vacuum suction path. Will flow into the side. As conventional refrigerant gas, a fluorocarbon gas of about 3 MPa or less, for example, has been used, but in recent years, use of high-pressure carbon dioxide gas of, for example, 10 MPa or more has been promoted. For this reason, if this high-pressure carbon dioxide gas passes and flows into the vacuum pump side, not only the oil used in the vacuum pump is ejected and the surroundings are soiled but also the vacuum pump may be damaged.

  Normally, a vacuum gauge for measuring and displaying the degree of vacuum is attached to the vacuum suction path, but if high-pressure carbon dioxide gas flows into the vacuum suction path as described above, the inflow of the carbon dioxide gas The vacuum gauge may be damaged by pressure. In addition, it is possible to use the compound meter which can also measure high pressure, such as 15 MPa, for the measurement of a vacuum degree. However, if a high pressure is measured with a compound meter in this way, the scale interval of the degree of vacuum within −0.1 MPa becomes extremely narrow, and the degree of vacuum cannot be measured in practice. For this reason, in order to measure the degree of vacuum, a vacuum gauge or a compound gauge with low pressure resistance is used, so that there is a high possibility that the above-described high-pressure gas will be damaged.

  The technical problem of the present invention is to eliminate the above-mentioned problems, allow suction by the vacuum pump, and prevent the flow of high-pressure gas to the vacuum pump side, which can protect the vacuum pump, vacuum gauge, etc. An object of the present invention is to provide a valve and a manifold valve for refrigerant injection provided with the valve.

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 shutoff valve, and an inlet passage (27), a shutoff valve chamber (28), and an outlet passage (29) are formed in this order in the valve box (26), and the valve is placed in the shutoff valve chamber (28). The seat (32) is formed, and the shut-off member (33) is inserted into the shut-off valve chamber (28) so as to be movable forward and backward with respect to the valve seat (32). 27) is urged toward the valve seat (32) by the gas pressure flowing into the shutoff valve chamber (28), and the valve opening chamber (30) is formed in the valve box (26). The piston member (35) is slidably inserted into the working chamber (30), and an atmosphere chamber (36) communicating with the atmosphere is formed on one side of the piston member (35), and the above-mentioned is formed on the other side. A negative pressure chamber (37) communicating with the outlet channel (29) is formed, and the piston member (35) is formed by a differential pressure between the atmospheric pressure in the atmospheric chamber (36) and the negative pressure in the negative pressure chamber (37). ) And the piston member (35) is configured to be able to be linked to the shut-off member (33), from the inlet passage (27) to the shut-off valve chamber (28). When the inflowing gas is lower than the set pressure, the blocking member (33) is separated from the valve seat (32) by the movement of the piston member (35).

  The present invention 2 relates to a manifold valve for refrigerant injection, and comprises an equipment connection port (3), an injection port (4), and a suction port (5) on the outer surface of the main body housing (2). A gas supply path (6) for communicating the device connection port (3) with the injection port (4) and a vacuum suction path (7) for communicating the device connection port (3) with the suction port (5) are provided. The shutoff valve (20) of the present invention 1 is provided in the vacuum suction passage (7), and the inlet passage (27) of the shutoff valve (20) is connected to the device connection port ( 3), and the outlet channel (29) communicates with the suction port (5).

  In the above shut-off valve, since the shut-off member comes into contact with the valve seat due to the pressure of the gas flowing into the shut-off valve chamber from the inlet passage to prevent the gas flow from the inlet passage to the outlet passage, Will not be leaked. On the other hand, when the outlet passage is vacuumed, the negative pressure chamber is depressurized, so that the piston member is urged by the differential pressure from the atmospheric pressure in the atmospheric chamber. Since the piston member is linked to the shut-off member, the biasing force due to the differential pressure received by the piston member is the biasing force received by the shut-off member by the pressure of the gas flowing into the shut-off valve chamber from the inlet passage. When it becomes larger than this, the blocking member moves to open the valve. That is, when the gas pressure flowing into the shut-off valve chamber is equal to or lower than the set pressure, the shut-off member is moved in the valve opening direction by the movement of the piston member and separated from the valve seat, and the inlet passage and the outlet passage are communicated. To do. As a result, the gas supply passage communicating with the inlet passage and the inside of the refrigerant-using device communicating with this are evacuated.

  Here, the above set pressure is within the range of an allowable pressure or less that does not cause damage to the vacuum pump or a vacuum gauge attached to the vacuum suction path, or oil is not ejected from the vacuum pump. The pressure value is set appropriately, and is set according to the evacuation performance of the connected vacuum pump, the balance between the piston diameter and the seal diameter of the blocking member, or the like. Note that the lower the set pressure, the more reliably the vacuum pump, vacuum gauge, etc. can be protected. However, if the gas pressure remaining in the refrigerant-using device is higher than this set pressure, the connection with this refrigerant-using device can be used. Since the shutoff valve is kept closed, it is necessary to separately exhaust the residual gas by operating an exhaust valve or the like before evacuation.

  The above shut-off valve only needs to be provided in the gas flow path between the suction port of the vacuum pump and the target device to be evacuated, and is configured as a single unit, for example, connected to the suction port of the manifold valve for refrigerant injection. It is also possible to connect to the middle part of the pipe. However, it can be provided integrally with the refrigerant injection manifold valve.

That is, for example, the refrigerant injection manifold valve includes an apparatus connection port, an injection port, and a suction port on the outer surface of the main body housing, and a gas supply path that communicates the apparatus connection port with the injection port in the main body housing. A manifold valve for refrigerant injection comprising a vacuum suction passage communicating the device connection port with the suction port, wherein the shutoff valve is provided in the vacuum suction passage, and the inlet passage of the shutoff valve is connected to the inlet passage. In addition to communicating with the device connection port, the outlet path can be communicated with the suction port.
Such a configuration is preferable because the above-mentioned valve box can be used also as the main body housing of the refrigerant injection manifold valve and can be implemented at low cost, and the operation is easy, for example, the labor for connection can be saved.

  The shut-off valve can also be provided integrally with the vacuum pump. For example, the vacuum pump can be configured by connecting the outlet passage of the shut-off valve to the intake port. In this case, even if an existing refrigerant injection manifold valve is used, this vacuum pump can be reliably protected from inflow of high-pressure gas, which is preferable.

Since the present invention is configured and operates as described above, the following effects can be obtained.
That is, when evacuating with a vacuum pump, the valve opens if the gas flowing from the inlet passage to the shutoff valve chamber is lower than the set pressure, so that the remaining gas can be reliably sucked from the target device or pipe. Can do. Moreover, since the valve is closed when the pressure of the gas flowing into the shutoff valve chamber is higher than the set pressure, it is possible to prevent the high pressure gas from flowing into the vacuum pump side through the outlet passage. As a result, it is possible to protect a vacuum pump, a vacuum gauge, and the like connected to the vacuum suction path, and it is possible to reliably prevent contamination due to oil scattering from the vacuum pump to the surroundings and breakage of these devices.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention, FIG. 1 is a system diagram of a refrigerant injection manifold valve, FIG. 2 is a front view of the refrigerant injection manifold valve, and FIG. 3 is the vicinity of a shut-off valve in a closed state. FIG. 4 is a view corresponding to FIG. 3 in the vicinity of the shut-off valve in the open state.

  As shown in FIGS. 1 and 2, the refrigerant injection manifold valve (1) includes a device connection port (3), an injection port (4), and a suction port (5) on the outer surface of the main body housing (2). . In the main body housing (2), a gas supply path (6) for communicating the device connection port (3) to the injection port (4) and a gas supply for the device connection port (3) to the suction port (5) are supplied. A vacuum suction path (7) communicating with a part of the path (6) is provided.

A refrigerant storage part of the refrigerant using device (8) is connected to the device connection port (3) via the sealing valve (9). A gas cylinder (10) as a refrigerant gas supply source is connected to the injection port (4) via a container valve (11).
The gas supply path (6) is provided with an injection valve (12), and the injection valve (12) is opened and closed by an injection operation handle (13) shown in FIG. As shown in FIG. 1, a pressure gauge side passage (14) and a gas escape passage (15) are branched between the injection valve (12) and the injection port (4). For example, a pressure gauge (16) capable of measuring a high pressure up to 25 MPa is attached to the pressure gauge side passage (14), and a safety valve (17) is attached to the gas escape passage (15).

The suction port (5) is connected to an intake port (18a) of a vacuum pump (18). The vacuum suction path (7) communicating with the suction port (5) branches from the gas supply path (6) on the upstream side of the injection valve (12), that is, on the injection port (4) side. It is. The vacuum suction path (7) is provided with a suction valve (19) and a shut-off valve (20). The suction valve (19) is opened and closed by a suction operation handle (21) shown in FIG. . A vacuum measurement path (22) is branched downstream of the shutoff valve (20), that is, on the suction port (5) side. The vacuum measuring path (22) is provided with a vacuum gauge (23) capable of measuring, for example, 0 to -0.1 MPa.
Note that an exhaust passage (24) is connected to the gas supply passage (6) via an upstream portion of the vacuum suction passage (7), and an exhaust valve (25) is connected to the exhaust passage (24). ) Is attached.

  In this embodiment, the vacuum suction path (7) is branched from the gas supply path (6) on the upstream side of the injection valve (12). However, in the present invention, this vacuum suction path is downstream of the injection valve. It may be branched from the gas supply path on the side, or may be directly communicated to the equipment connection port.

  The shutoff valve (20) has an inlet passage (27), a shutoff valve chamber (28), and an outlet passage (29) formed in this order in the valve box (26). A later-described shut-off member inserted into the shut-off valve chamber (28) is urged in the valve closing direction by the gas pressure flowing into the shut-off valve chamber (28) from the inlet passage (27). A valve opening working chamber (30) is formed in the valve box (26), and an air chamber and a negative pressure chamber, which will be described later, are formed in the valve opening working chamber (30). This atmospheric chamber communicates with the atmosphere via the atmospheric communication passage (31), while the negative pressure chamber communicates with the outlet passage (29). Then, a piston member, which will be described later, inserted into the valve opening working chamber (30) is linked to the above-described blocking member, and this blocking member is biased in the valve opening direction by the differential pressure between the atmospheric chamber and the negative pressure chamber. It is comprised so that it may do. The urging force in the valve opening direction by the piston member is such that, for example, when the gas pressure flowing into the shut-off valve chamber (28) from the inlet passage (27) is 2 MPa or less, the shut-off member is moved in the valve opening direction. It is set to a size that can be done.

Next, a specific structure of the shut-off valve (20) will be described with reference to FIGS.
The valve box (26) of the shut-off valve (20) is also used as the main body housing (2) of the refrigerant injection manifold valve (1), and the inlet passage is provided in the valve box (26). (27), the shut-off valve chamber (28), and the outlet passage (29) are formed in this order.
In the shut-off valve chamber (28), a valve seat (32) is formed around the opening end of the outlet passage (29) that opens to the shut-off valve chamber (28). A shut-off member (33) is inserted into the shut-off valve chamber (28) so as to be movable forward and backward with respect to the valve seat (32), and flows into the shut-off valve chamber (28) from the inlet passage (27). The blocking member (33) is biased toward the valve seat (32) by the gas pressure.

  In this embodiment, the shutoff member (33) is biased toward the valve seat (32) by the return spring (34) inserted into the shutoff valve chamber (28). As a result, even when the pressure in the inlet passage (27) or the shut-off valve chamber (28) is low, the shut-off member (33) is urged and stops against the valve seat (32) when the evacuation described later is stopped. The gas flow from the inlet channel (27) to the outlet channel (29) is blocked.

  In the valve box (26), the valve opening working chamber (30) is formed in the outlet passage (29), and the piston member (35) is sealed in the valve opening working chamber (30). It is slidably inserted. An atmospheric chamber (36) is formed on one side of the piston member (35), and the atmospheric chamber (36) is externally connected via the atmospheric communication passage (31) formed in the valve box (26). It communicates with the space. Further, a negative pressure chamber (37) communicating with the outlet passage (29) is formed on the other side of the piston member (35), and the vacuum measurement passage is formed in the negative pressure chamber (37). (22) is in communication. When the inside of the negative pressure chamber (37) is reduced to an atmospheric pressure or lower, the above-mentioned piston member (by the pressure difference between the negative pressure in the negative pressure chamber (37) and the atmospheric pressure in the atmospheric chamber (36) ( 35) is biased toward the shut-off valve chamber (28).

  The blocking member (33) is provided with a rod-shaped valve opening operation member (38), and the piston member (35) is connected to the blocking member (33) via the valve opening operation member (38). It is linked to. In this embodiment, the piston member (35) is linked to the shut-off member (33) via the valve opening operation member (38) extending from the shut-off member (33). However, in the present invention, this valve opening operation member may be provided on the piston member, or may be constituted by a separate member from the blocking member and the piston member. Furthermore, you may comprise so that said piston member can be directly linked | coupled with the interruption | blocking member.

  The piston diameter of the piston member (35) is such that the urging force generated by the differential pressure between the atmospheric chamber (36) and the negative pressure chamber (37) is a predetermined set pressure in the shutoff valve chamber (28), For example, the blocking member (33) is set to be strong enough to be separated from the valve seat (32) against a pressure of 1 to 2 MPa or less.

The refrigerant injection manifold valve (1) is operated as follows.
First, the vacuum pump (18) is driven with the container valve (11) of the gas cylinder (10) closed and the injection valve (12) and the suction valve (19) opened. At this time, if high-pressure gas remains in the refrigerant-using device (8) or in the gas supply path (6), the high-pressure gas flows from the inlet path (27) of the cutoff valve (20) to the cutoff valve. Since it flows into the chamber (28) and keeps the shut-off member (33) in a closed state, the upstream side of the shut-off valve (20) cannot be evacuated. In this case, prior to driving the vacuum pump (18), the exhaust valve (25) is opened, high pressure gas remaining in the gas supply passage (6) and the like is discharged, and then the exhaust valve ( 25) is closed and the vacuum pump (18) is driven.

  By driving the vacuum pump (18), the negative pressure chamber (37) is depressurized to an atmospheric pressure or lower, and the piston member (37) and the atmospheric pressure chamber (36) are subjected to the pressure difference between the negative pressure chamber (37) and the atmospheric chamber (36). 35) moves, and the blocking member (33) is pressed in the valve opening direction via the valve opening operation member (38). At this time, the gas pressure in the shut-off valve chamber (28) is lower than a predetermined set pressure due to the operation by the exhaust valve or the like. Therefore, the shut-off member (33) is separated from the valve seat (32) against the gas pressure, and the valve opening state shown in FIG. 4 is established, so that the inlet passage (27) and the outlet passage (29) are separated. Communicate with each other. As a result, the inside of the refrigerant reservoir of the refrigerant-using device (8), the gas supply path (6), the vacuum suction path (7), etc. is evacuated by the vacuum pump (18), and the residual gas and residual air are sufficiently discharged. Exhausted.

When the evacuation operation is completed, the suction valve (19) is closed and the container valve (11) is opened. As a result, the refrigerant gas is supplied from the gas cylinder (10) and injected into the refrigerant reservoir of the refrigerant using device (8).
At this time, if the suction valve (19) is in an open state, high-pressure refrigerant gas flows from the inlet passage (27) into the shutoff valve chamber (28). Then, the blocking member (33) moves to the valve seat (32) side against the biasing force of the piston member (35) by the pressure of the inflowing gas, and moves to the valve seat (32). Abut. As a result, the communication between the inlet passage (27) and the outlet passage (29) is blocked, so that the high-pressure gas from the outlet passage (29) to the vacuum pump (18) or the vacuum gauge (23) side is Outflow is prevented.

  When the injection of the refrigerant gas from the gas cylinder (10) is completed, the container valve (11) and the sealing valve (9) are closed. Then, after opening the exhaust valve (25) to exhaust the refrigerant gas remaining in the gas supply path (6), the connection between the equipment connection port (3) and the equipment using the refrigerant (8) is released to inject the refrigerant. End the process.

  In the first embodiment, the shutoff valve (20) is integrally formed with the main body housing (2) of the refrigerant injection manifold valve (1). However, according to the present invention, the above-described shut-off valve can be incorporated in the intake port of the vacuum pump, and the shut-off valve can be formed as a single unit, for example, as in the second embodiment shown in FIG. It is.

  That is, in the second embodiment shown in FIG. 5, an inlet nozzle (39) is formed at one end of the valve box (26), a gas inlet (40) is opened at the end, and an outlet nozzle ( 41) is formed, and a gas outlet (42) is opened at the end thereof. In the valve box (26), an inlet passage (27), a shut-off valve chamber (28), and an outlet passage (29) are formed in this order between the gas inlet (40) and the gas outlet (42). is there. Since other configurations are the same as those in the first embodiment, description thereof will be omitted. The shutoff valve (20) of the second embodiment is used similarly to the first embodiment by connecting the inlet nozzle (39) to, for example, a suction port of a conventional refrigerant injection manifold valve. The

  The refrigerant injection manifold valve and the shut-off valve described in each of the above embodiments are examples for embodying the technical idea of the present invention, and include a shut-off member, a return spring, a valve opening operation chamber, a piston member, and the like. The shape, structure, arrangement, etc. are not limited to these embodiments, and various modifications can be made within the scope of the claims of the present invention. Needless to say, the gas to be handled is not limited to a specific type.

  For example, in the above embodiment, the shutoff valve is provided on the downstream side of the suction valve, that is, on the suction port side. However, the shutoff valve of the present invention may be provided in the vacuum suction path, and may be provided upstream of the suction valve. Furthermore, since this shut-off valve allows vacuum evacuation, it can block the flow of high-pressure gas into the outlet passage, so that the above suction valve can be omitted when it is provided in the vacuum suction passage. is there.

  In the above embodiment, the valve seat is formed on the outlet path side of the shut-off valve chamber, and the shut-off member is urged in the valve closing direction by the gas pressure in the shut-off valve chamber. However, in the present invention, a valve seat is formed on the inlet passage side of the shut-off valve chamber, for example, a pressure receiving chamber communicating with the inlet passage is provided in the shut-off valve chamber, and the shut-off member is biased in the valve closing direction by the gas pressure in the inlet passage. Is also possible.

  In the above-described embodiment, the piston member is moved to the shut-off valve chamber side by the differential pressure between the atmospheric chamber and the negative pressure chamber. However, in the present invention, the piston member may be urged by the differential pressure in the direction in which the shut-off member associated therewith opens, and depending on the arrangement of the valve closing operation chamber and the shut-off member, It may be energized in a direction away from the shutoff valve chamber.

  The shut-off valve of the present invention and the refrigerant injection manifold valve equipped with the shut-off valve can protect the vacuum pump, vacuum gauge, etc. while allowing suction by the vacuum pump and preventing high-pressure gas from flowing into the vacuum pump side. Therefore, it is particularly preferably used when the refrigerant is injected into the refrigerant-using device, but is also preferably used as a protective device attached to the vacuum suction path for other uses.

It is a systematic diagram of a manifold valve for refrigerant injection showing a 1st embodiment of the present invention. It is a front view of a manifold valve for refrigerant injection of a 1st embodiment. It is a vertical left side view of the vicinity of the shut-off valve in the closed state in the first embodiment. FIG. 4 is a view corresponding to FIG. 3 in the vicinity of the shut-off valve in the valve opening state of the first embodiment. It is a longitudinal cross-sectional view of the cutoff valve of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Manifold valve for refrigerant injection 2 ... Body housing 3 ... Equipment connection port 4 ... Injection port 5 ... Suction port 6 ... Gas supply path 7 ... Vacuum suction path
18 ... Vacuum pump
18a ... Vacuum pump (18) inlet
20 ... Shut-off valve
26 ... Valve box
27 ... Entrance way
28 ... Shut-off valve chamber
29 ... Exit road
30 ... Valve opening chamber
32 ... Valve seat
33… Blocking member
35 ... Piston member
36 ... Air chamber
37 ... Negative pressure chamber

Claims (2)

In the valve box (26), an inlet passage (27), a shut-off valve chamber (28) and an outlet passage (29) are formed in this order, and a valve seat (32) is formed in the shut-off valve chamber (28).
A shut-off member (33) is inserted into the shut-off valve chamber (28) so as to be movable forward and backward with respect to the valve seat (32), and the shut-off member (33) is inserted into the shut-off valve chamber (28) from the inlet passage (27). ) Is urged toward the valve seat (32) by the gas pressure flowing into
A valve opening working chamber (30) is formed in the valve box (26), and a piston member (35) is slidably inserted into the valve opening working chamber (30).
An air chamber (36) communicating with the atmosphere is formed on one side of the piston member (35), and a negative pressure chamber (37) communicating with the outlet passage (29) is formed on the other side. The piston member (35) is urged by the pressure difference between the atmospheric pressure in the chamber (36) and the negative pressure in the negative pressure chamber (37),
The piston member (35) is configured to be able to be linked to the shut-off member (33), and when the gas flowing into the shut-off valve chamber (28) from the inlet passage (27) is below a set pressure, the piston member A shutoff valve characterized in that the shutoff member (33) is separated from the valve seat (32) by the movement of (35). A device connection port (3), an injection port (4), and a suction port (5) are provided on the outer surface of the main body housing (2).
In this main body housing (2), a gas supply path (6) for communicating the device connection port (3) with the injection port (4) and a vacuum for communicating the device connection port (3) with the suction port (5). A refrigerant injection manifold valve having a suction path (7),
A shutoff valve (20) according to claim 1 is provided in the vacuum suction passage (7), an inlet passage (27) of the shutoff valve (20) is communicated with the device connection port (3), and an outlet passage is provided. (29) A manifold valve for injecting refrigerant, wherein the suction port (5) is communicated.

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