JP2008298277A - Valve device and adapter of valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To successfully carry out air purge in valve closure and coolant pressure measurement in valve opening without impairing the significance of downsizing and weight reduction by making a valve core built in a valve rod. <P>SOLUTION: The valve device includes the valve rod 1 moving forward and backward by rotating operation, and a valve element 3 having a valve hole 38 moving forward and backward the valve rod 1 and a refrigerant passage 7 opening and closing according to the forward/backward movement of the valve rod 1 therein. The valve device contains the valve core 91 opening when a charge hose is connected to the valve rod 1. At the axial direction operation end side of the valve rod 1, an adapter uniting portion 16 attaching and detaching an adapter A relaying the connection of the charge hose and opening the valve core 91 is provided. The adapter uniting portion 16 is set to have a size which can be stored in an inner diameter of the valve hole 36. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a valve device for an air conditioner in which a valve core that is opened when a charge hose is connected in connection with an installation operation of the air conditioner or the like is incorporated in a valve rod, and the connection between the valve device and the charge hose is relayed. Concerning the adapter to be used.

Conventionally, it has been proposed by Patent Document 1 or the like to incorporate a valve core in the valve stem for the purpose of reducing the size and weight, and when connecting an external pipe extending from the indoor unit, the valve rod is pulled up to circulate the refrigerant indoors and outdoors. Before starting the operation, remove the cap (valve cover) from the valve body and connect the charge hose with insect push, and push the valve core built in the valve stem by the push of the insect to open and charge the external piping side, that is, the indoor piping system. It is connected to a vacuum pump via a hose so that the indoor piping system can be purged by evacuation.
JP 2001-349646 A

  However, in the above-described document, air purge can be performed when the valve rod is in the closed operation position, but when opening the valve to lift the valve rod and circulate the refrigerant indoors and outdoors, the valve connected to the charge hose. Since the relative position of the body and the valve stem with a built-in valve core that pushes with an insect pusher has changed significantly from when the valve is closed, it is difficult to connect the charge hose securely without leaking refrigerant. There is a problem that the refrigerant pressure cannot be measured in periodic inspections, abnormal inspections, and the like.

  As an improvement to this, it is conceivable to provide a charge hose connection on the valve stem side. In this case, the operation end side of the valve stem is enlarged, and the significance of miniaturization and weight reduction by incorporating the valve core in the valve stem is lost. Will be.

  In the present invention, there is provided a valve device that can satisfactorily perform air purge at the time of valve closing, refrigerant pressure measurement at the time of valve opening, etc., without impairing the original significance of reducing the size and weight by incorporating the valve core in the valve stem. In addition, an object of the present invention is to provide an adapter that can satisfactorily connect the valve device and the charge hose.

  A valve device (V) for solving the above problem is shown together with reference numerals of components illustrated in the drawings. That is, the valve rod (1) that advances and retreats by rotating operation, the valve hole (36) that advances and retreats the valve rod (1), and the refrigerant passage (7) that opens and closes by the advancement and retraction of the valve rod (1) are provided inside. A valve core (91) that includes a body (3) and is opened when the charge hose (C) is connected to the valve stem (1), on the axial operation end side of the valve stem (1). An adapter coupling portion (16) for detaching an adapter (A) for opening the valve core (91) by relaying the connection of the charge hose (C) is provided, and the adapter coupling portion (16) is connected to the valve hole. The size was set to fit within the inner diameter of (36).

  A projecting portion (160) projecting out of the valve hole (36) at the opening operation position of the valve stem (1) is provided on the axial operation end side of the valve stem (1), and this projecting portion (160) It is preferable to provide a stopper locking portion (161) for locking the stopper (S) for restricting the interlocking displacement of the valve stem (1) accompanying the coupling at the adapter coupling portion (16).

  A mortar type that receives the seal ring (R) held on the adapter side at the end of the protrusion (160) and presses the seal ring (R) in accordance with the coupling depth at the adapter coupling portion (16). More preferably, the seal ring receiver (162) is provided, and the adapter coupling portion (16) is provided inside the seal ring receiver (162).

  An external pipe side refrigerant passage (71) leading to the external pipe (2) is provided on the tip opposite side of the valve rod (1) in the closed operation position, and the axial direction of the valve rod (1) It is preferable to provide a communication hole (18) that allows the external pipe side refrigerant passage (71) to communicate with the charge hose (C) when the valve core (91) is opened. The said exterior piping (2) means the piping extended from other apparatuses, such as an indoor unit which becomes the exterior with respect to apparatuses, such as an outdoor unit with which a valve apparatus is equipped.

  An adapter (A) for solving the above problem is a valve device (V) in which a valve core (91) is built in a valve rod (1) that is advanced and retracted into a valve hole (36), and a charge hose (C) with an insect push. A main body (A1) having a hose connection part (A11) for connecting and disconnecting the charge hose (C) and an inner passage (A12) communicating with the charge hose (C); Actuator (A2) inserted with passage secured inside passage (A12), pressing rear end of valve core (91) at the tip by contacting rear end of insect hose (C1) of charge hose (C) Provided in the front portion of the main body (A1) from which the tip of the operating body (A2) protrudes, and is provided with a protrusion portion (A3) of a size that protrudes into the valve hole (36). Before A3) Valve stem (1) and the valve stem coupling portion for removably coupled to (A4) are provided.

  According to the said valve apparatus (V), a charge hose (C) can be connected with respect to a valve stem (1) by couple | bonding an adapter (A) with an adapter coupling | bond part (16). The relative positional relationship between the charge hose (C) and the valve stem (1) does not change both when the valve stem (1) is closed and when it is open. A reliable connection without refrigerant leakage or the like can be performed both when the valve is closed and when the valve is opened. In this way, the charge hose (C) is connected by connecting the adapter (A) to the valve stem (1), and the adapter coupling portion (16) provided on the valve stem (1) is connected to the valve hole (36). Since it is set to a size that fits within the inner diameter, the axial operation end side of the valve stem (1) does not increase in size, and the merit of reduction in size and weight due to the incorporation of the valve core (91) in the valve stem (1) is impaired. Therefore, the air purge at the time of closing the valve, the refrigerant pressure measurement at the time of opening the valve can be performed well, and the maintainability can be improved.

  In the valve device (V), when the stopper locking portion (161) is provided, the valve stem (1) is advanced and retracted and the adapter (A) is coupled by the normal right-handed screw principle. If the adapter (A) is connected at the time of valve operation, the valve stem (1) may be inadvertently displaced to return to the closed operation position. However, the stopper (S) is locked to the stopper locking portion (161). This can be regulated effectively, and the adapter (A) can be well connected even when the valve is open.

  In the valve device (V), when a mortar-shaped seal ring receiver (162) is provided and an adapter coupling portion (16) is provided on the inside thereof, the mortar-shaped seal ring receiver (162) serves as a guide and serves as an adapter. (A) can be well guided to the adapter coupling part (16), and the seal ring (R) is pressed in accordance with the coupling depth at the adapter coupling part (16). A good seal structure can be obtained by pressing the seal ring (R) around. For this reason, it is possible to almost certainly prevent the refrigerant from leaking outside, and the workability and safety during service work can be effectively improved.

  In the valve device (V), the external pipe side refrigerant passage (71) is connected to the tip opposite side of the valve rod (1) in the closed operation position, and the charge hose (C) is connected in the axial direction of the valve rod (1). When each communication hole (18) is provided, air purge when the valve is closed can be effectively performed via the communication hole (18) provided in the axial direction of the valve rod (1), and the refrigerant pressure measurement when the valve is opened is also axial. This can be effectively done through the communication hole (18). Since the communication hole is not provided in the radial direction of the valve stem (1), the workability of the valve stem (1) can be improved and the circumference of the trunk of the valve stem (1) can be made free of holes. Can be thoroughly suppressed, and the valve stem (1) can be advanced and retracted well.

  According to the adapter (A), by connecting the valve stem coupling part (A4) to the valve stem (1) and connecting the charge hose (C) to the hose connection part (A11) of the main body (A1). The valve core (91) can be pushed by the operating body (A2) to open the interior to the charge hose (C) through the inner passage (A12). This operation mode is the same when the valve rod (1) is in the closed operation position and when the valve rod (1) is in the open operation position, both of which are relative to the charge hose (C) and the valve rod (1). The positional relationship does not change. For this reason, the valve stem (1) and the charge hose (C) can be reliably connected in a good state with no leakage of refrigerant or the like both when the valve is closed and when the valve is opened. In addition, the valve stem coupling portion (A4) is provided in the projection portion (A3) sized to enter the valve hole (36) so that it can be coupled to the valve stem (1) inside the valve hole (36). Therefore, it is not necessary to increase the size of the axial operation end side of the valve stem (1), and the merit of reduction in size and weight due to the incorporation of the valve core (91) in the valve stem (1) can be favorably maintained. By using this adapter as a service maintenance equipment, air purge and refrigerant pressure measurement in the valve device of each individual user can be performed well in common, and maintainability can be improved.

  As shown in FIG. 1, a valve device V having a valve rod with a built-in valve core according to the present invention includes a gas side valve 100 that connects an outdoor pipe 2 composed of a gas side pipe 20 extending from an indoor unit 200 to an outdoor unit 300. Has been applied. A valve core is not provided in the liquid side valve 101 that connects the liquid side pipe 21 that is the other side of the outside pipe 2 to the outdoor unit 300. However, the valve device V of the present invention having a valve rod with a built-in valve core may also be applied to the liquid side valve 101. The gas side valve 100 and the liquid side valve 101 are supported by the support body 4 fixed to the outdoor unit frame 400.

  The indoor unit 200 includes an indoor heat exchanger 500 that serves as an evaporator during indoor cooling and serves as a condenser during heating. The outdoor unit 300 includes a compressor 600, a pair of fixed ports 701 and 702, and a pair of switching ports 703 and 704, a four-way switching valve 700 for switching between cooling and heating, and becomes a condenser during indoor cooling and evaporates during the heating. An outdoor heat exchanger 800 and an expansion valve 900 are provided. The gas side valve 100 and the four-way switching valve 700 are connected by an in-machine pipe 5 including a gas pipe 50, and the liquid side valve 101 and the expansion valve 900 are connected by an in-machine pipe 5 including a liquid pipe 51. Yes.

  As shown in FIG. 2, the valve body 3 of each valve 100, 101 is between a valve rod operating end 31 into which the valve lid 6 is screwed and a pipe connecting end 32 into which the flare nut 8 for connecting to the outside pipe is screwed. And a non-circular body portion 33 having a regular hexagonal cross section. A recessed portion 34 formed of an annular groove is provided slightly above the fixed portion of the in-machine piping 5 on the outer surface of each body portion 33.

  The support 4 includes a base plate 41 and a side plate 42 in an L shape. Each non-circular body portion 33 is engaged with a body portion engaging portion 43 formed of a regular hexagonal hole provided in the base plate 41 to restrict the rotational displacement of the valves 100 and 101. Locking plates 45 and 46 each provided with a recessed portion engaging portion 44 formed of a semicircular notch that enters each recessed portion 34 are screwed to the base plate 41 to restrict axial displacement of the valves 100 and 101. is doing. Reference numeral 420 denotes a notch that avoids interference between the side plate 42 and each in-machine piping 5. The gas side valve 100 is slightly larger than the liquid side valve 101.

  As shown in FIG. 3, the gas side valve 100 constituting the valve device V of the present invention includes a service valve mechanism 9 having a valve core 91 that is opened during service work such as air purge or refrigerant pressure measurement inside the valve rod 1. It is crowded. The valve stem 1 is made of a machined product from a rod-shaped member having a circular cross section such as a brass round bar material or an aluminum round bar material, and is formed from a truncated cone that is seated on or separated from a circular valve seat 30 on the valve body 3 side. A valve head 11 at the leading end, a cylindrical portion 12 continuing to the valve head 11, a male threaded portion 13 screwed into a female threaded portion 360 provided in the valve hole 36 of the valve body 3, and a ring interposing a seal ring 10 comprising an O-ring. An operation hole 15 comprising a hexagon hole into which an operation tool such as a groove 14 and a hexagon wrench is inserted is provided.

  The valve stem 1 is located on the axial operation end side within the inner diameter of the valve hole 36 when the valve stem 1 is in the closed operation position, and outside the valve hole 36 when the valve stem 1 is in the open operation position. A cylindrical projecting portion 160 is provided to project. A stopper locking portion 161 formed of an annular groove for locking the stopper S described later when the valve is opened is provided on the outer peripheral portion of the projecting portion 160, and a mortar-shaped seal ring receiver 162 is provided on the inner end portion thereof. An adapter coupling portion 16 comprising a female screw for attaching and detaching an adapter A, which will be described later, which opens the valve core 91 continuously, is provided continuously inward. A pin hole 17 with a reduced diameter and a communication hole 18 extending in the axial direction penetrating to the lower end are provided at the lower portion of the insertion hole 15.

  The service valve mechanism 9 includes a pin-shaped valve core 91 that is inserted into the pin hole 17, a resin-made annular seat 92 that normally seals the communication hole 18 side against the insertion hole 15 side, and biases the valve core 91 upward. A coil spring 93 that presses the annular sheet 92 against the tapered surface 170 below the pin hole 17, and a spring receiver 94 that receives the lower end of the spring 93. A contact head 910 is formed at the upper part of the valve core 91, a guide 911 that slides into the pin hole 17 is provided at the middle part, and a flange 912 that receives the lower end of the annular seat 92 and the upper end of the coil spring 93 is integrated at the lower part. . The spring receiver 94 has a hole at the center and is held by a crimping portion 19 provided at the tip of the valve head 11 at the outer periphery.

  The valve body 3 is made of a machined product from a rod-shaped member having a non-circular cross section such as a brass square bar material or an aluminum square bar material, and is formed in a cylindrical shape as a whole. The square bar material has a regular hexagonal cross section, but a regular square cross section, a D-shaped cross section with a straight cut part on the circumference, and two straight cuts facing each other on the circumference. It may have a tar-shaped cross section with a part. On the valve stem operating end 31 side, there are a threaded portion 60 of the valve lid 6, a bending portion 311 for preventing the valve stem 1 and restricting the opening operation position, and a wide opening 312 inside thereof. In the valve lid 6, an annular edge 61 provided on the inner side is brought into pressure contact with an annular tapered surface portion 313 provided at a base portion of the bending portion 311, thereby double-sealing the operation end side of the valve stem 1.

  On the pipe connection end 32 side of the valve stem 3, there are a threaded portion 80 of the flare nut 8 and a tapered surface portion 321 facing the inner flare 81 of the flare nut 8. Before connecting the external pipe 2, the flare cap 88 is held between the tapered surface portion 321 and the inner flare 81 to protect the refrigerant passage 7 (external pipe-side refrigerant passage 71) provided inside the valve body 3. Yes. On the side of the valve hole 36 sandwiching the valve seat 30, a refrigerant passage 7 (in-machine piping side refrigerant path 72) is provided in the lateral direction so as to communicate with the in-machine piping 5.

  As shown in FIG. 4, the liquid side valve 101 does not have a service valve mechanism, and is provided with an operation hole 15 made of a hexagonal hole for inserting an operation tool such as a hexagon wrench inside the valve stem 1 in a non-penetrating manner. The operation end side of the rod 1 is finished flat. Other configurations are the same as those of the gas side valve 100.

  As shown in FIG. 5, at the time of service work such as air purge or refrigerant pressure measurement, the charge hose C extending from the gauge manifold G to which the vacuum pump B is connected, and the connection between the charge hose C and the valve device V (100) are relayed. A stopper S that prevents interlocking displacement due to rotation of the valve stem 1 when the adapter A is connected to the adapter A when the valve is opened is used. The gauge manifold G is connected to the low pressure side pressure gauge G1, the same open / close valve G2, the same charge hose connector G3, the high pressure side pressure gauge G4, the same open / close valve G5, the same charge hose connector G6, a vacuum pump or a refrigerant cylinder. A device connector G7 is provided.

  The tip of the charge hose C is integrally provided with an insect push C1 that pushes down the valve core 91 to open it, and an inner cylinder C3 that holds the expanded annular seal body C2 made of resin. On the outside of the inner cylinder C3, an outer cylinder C5 having a female screw C4 cut inside is rotatably held.

  The adapter A includes a tapered surface portion A10 that abuts against the annular seal body C2, a hose connection portion A11 that includes a male screw that engages with the female screw C4 of the outer cylinder C5, an inner passage A12 that communicates with the inside of the charge hose C, and a handle. The main body A1 having the large-diameter cylindrical portion A13 that can be used, and the inner end of the inner passage A12 are inserted in a state where the passage is secured. And a pressing body A2. A front portion of the main body A1 that protrudes the tip of the operating body A2 is provided with a protrusion portion A3 that is large enough to protrude into the valve hole 36. The protrusion portion A3 is screwed onto the female screw of the adapter coupling portion 16 of the valve stem 1. A small-diameter valve stem coupling portion A4 having a mating male screw is provided.

  The actuating body A2 has a long thin rod portion A21, a deformable rod portion A22 on the rear end side that secures a passage by vertically passing two outer peripheral portions displaced by 180 degrees, and a slide guide for the small rod portion A21. A pair of bulging pieces A23 provided by being displaced by 180 degrees, a rear end locking collar A24 in which the outer periphery of the deformed rod A22 is widened, and an insect pusher in which the outer periphery of the deformed rod A22 is narrowed A contact portion A25 is provided. A C-shaped ring A5 to be engaged with the stepped portion A20 of the stepped hole constituting the inner passage A12 is positioned between the deformed rod portion A22 and the bulging piece A23, and the main body is not detached from the operating body A2. A1 is held. An annular groove A6 is provided at the base portion of the valve stem coupling portion A4, and a seal ring R made of a resin O-ring is fitted to the annular groove A6.

  The stopper S has a U-shaped notch S1 that has a thickness that protrudes into an annular groove that constitutes the stopper locking portion 161 on the valve stem 1 side, and that engages with the annular groove with a strong half circumference.

  As shown in FIG. 6, at the time of installation, the flare nut 8 is held by the flare nut 8 provided at the tip of the external pipe 20 (2), and the flare nut 8 is screwed to press the flare 220 into the tapered surface portion 321. . 230 is a heat insulating material wound around the external pipe 20 (2). The air purge is performed in a closed state before the valve rods 1 of the valves 100 and 101 are pulled up.

  The valve lid 6 is removed, and the entry portion A3 of the adapter A is inserted into the valve hole 36. At this time, the mortar-shaped seal ring receiver 162 serves as a guide, and the valve stem coupling portion A4 can be favorably guided to the adapter coupling portion 16. When the valve stem coupling portion A4 is screwed into the adapter coupling portion 16, the seal ring R is pressed in accordance with the screwing depth, and when the coupling is completed, a good seal structure is obtained around the coupling portion. However, in the closed state before the air purge, even if the valve core 91 is pushed down by the operating body A2, there is no harmful effect.

  As shown in FIG. 7, the outer cylinder C5 of the charge hose C is screwed into the hose connection part A11 of the adapter A. The valve core 91 is pushed down by the operating body A2 pushed by the insect push C1 of the charge hose C, and the outside piping side refrigerant passage 71 side, that is, the outside piping 2 and the indoor piping system including the indoor heat exchanger 500 are used as the vacuum pump B. Can be connected. The space between the valve stem 1 and the adapter A is sealed by a seal ring R, and the space between the adapter A and the charge hose C is sealed by an annular seal body C2. By operating the vacuum pump B, air purge of the indoor piping system can be performed. Note that the charge hose C may be connected to the adapter A in advance, and may be coupled to the valve stem 1.

  As shown in FIG. 8, when the air purge is completed, the adapter A is removed from the adapter coupling portion 16, an operation tool such as a hexagon wrench is inserted into the insertion hole 15, the valve stem 1 is rotated counterclockwise, and the bent portion Pull up until the valve stem 1 hits inside 311. At this time, the annular groove of the stopper locking portion 161 appears just outside the valve body 3. In addition, the valve stem 1 of the liquid side valve 101 is also pulled up with a hexagon wrench after air purge. Thus, the refrigerant can circulate indoors and outdoors.

  As shown in FIG. 9, when the refrigerant pressure is measured subsequent to the air purge, or when additional refrigerant charging is performed subsequent to the air purge due to the long external piping 2, etc., regularly or abnormally, etc. When the refrigerant pressure is measured or when the refrigerant is additionally charged irregularly due to some failure, the adapter A is coupled with the valve rod 1 being opened. At this time, the stopper S is locked to the stopper locking portion 161 to prevent the valve rod 1 from being rotated and returned to the valve closing side. Also, a flexible spacer A7 made of rubber or the like is interposed between the main body A1 and the flange A24 of the operating body A2 so that the operating body A2 is not pushed down inadvertently in this valve open state. Is preferred.

  As shown in FIG. 10, after coupling the adapter A in the valve open state, the charge hose C is connected to the hose connection portion A <b> 11, and the refrigerant pressure is measured by the gauge manifold G. At the time of indoor cooling including forced cooling operation such as after installation, the charge hose C is connected to the low pressure side charge hose connector G3, the low pressure side opening / closing valve G2 is opened, and the low pressure side pressure gauge G1 is read. During indoor heating, the charge hose C is connected to the high pressure side charge hose connector G6, the high pressure side opening / closing valve G5 is opened, and the high pressure side pressure gauge G4 is read. At the time of additional charging of the refrigerant, forced cooling operation is performed, the charge hose C is connected to the charge hose connector G3 on the low pressure side, and the refrigerant cylinder is connected to the external device connector G7.

  As shown in FIG. 11, in a normal use state after installation, the valve stem 1 is kept in the valve open state in the open operation position, and the valve lid 6 is screwed into the valve stem operation end 31. In this state, the air conditioner is used for a long time.

The refrigerant circuit figure of the air conditioner to which this invention valve apparatus is applied. The external appearance perspective view of the valve device. Sectional drawing of the valve state of the valve apparatus. Sectional drawing of the valve closing state of a liquid side valve. Explanatory drawing of the service work equipment containing this invention adapter. Sectional drawing which couple | bonded the adapter with the valve apparatus of a valve closing state. Sectional drawing which connected the charge hose. Sectional drawing of the valve opening state which removed the valve lid. Sectional drawing which couple | bonded the adapter with the valve apparatus of a valve opening state. Sectional drawing which connected the charge hose. Sectional drawing of the valve opening state which covered the valve cover.

Explanation of symbols

1; valve rod, 2; external piping, 3; valve body, 7; refrigerant passage,
16; Adapter connection part, 18; Communication hole,
36; valve hole, 71; external pipe side refrigerant passage, 91; valve core,
160; protrusion, 161; stopper locking portion, 162; seal ring receiver,
A: Adapter, C: Charge hose,
S: Stopper, R: Seal ring, V: Valve device,
A1; Main body, A2; Actuator, A3; Entry part, A4; Valve stem coupling part C1; Insect pushing, A11; Hose connection part, A12;

Claims (5)

A valve rod that advances and retreats by a rotating operation; a valve hole that opens and closes the valve rod; and a valve body that opens and closes by advancing and retreating of the valve rod; and opens when the charge hose is connected to the valve rod In a valve device with a built-in valve core,
An adapter coupling part for attaching and detaching an adapter for relaying the connection of the charge hose to open the valve core is provided on the axial operation end side of the valve stem, and the adapter coupling part is large enough to fit within the inner diameter of the valve hole. A valve device characterized in that it is set.   Provided on the axial operation end side of the valve stem is a projecting portion that projects out of the valve hole at the valve stem opening operation position, and the projecting portion of the valve stem accompanying the coupling at the adapter coupling portion The valve device according to claim 1, further comprising a stopper locking portion that locks a stopper that regulates the interlocking displacement.   A mortar-shaped seal ring receiver for receiving the seal ring to be held on the adapter side and press-contacting the seal ring in accordance with the coupling depth at the adapter coupling portion is provided at the end of the protruding portion. The valve device according to claim 2, wherein the adapter coupling portion is provided inward.   An external pipe side refrigerant passage that communicates with the external pipe is provided on the opposite side of the valve stem at the closed operation position, and the external pipe side refrigerant path is provided in the axial direction of the valve stem when the valve core is opened. The valve device according to any one of claims 1 to 3, wherein a communication hole is provided for communicating with the charge hose. A valve device adapter that connects a valve device with a built-in valve core to a valve rod that advances and retracts into a valve hole to a charge hose with an insect pusher,
A main body having a hose connection part for attaching and detaching the charge hose and an inner passage communicating with the charge hose;
Inserted inside the inner passage with the passage secured, and an actuating body that pushes the valve core at the tip by bringing the rear end into contact with the push of the charge hose,
The front part of the main body from which the tip of the operating body protrudes is provided with a protrusion part sized to enter the valve hole, and a valve rod coupling part that is detachably coupled to the valve stem is provided at the protrusion part. A valve device adapter characterized by that.

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