A gas supply control valve

Abstract

The application relates to the technical field of control valves, in particular to a gas source control valve which comprises a valve shell and a valve core slidingly connected in the inner cavity of the valve shell, an air inlet and an air outlet are arranged on the side wall of the valve shell, a pressure chamber is arranged in the valve shell, the pressure chamber is in a closed state, an air outlet of an air pipe is located on the sliding direction of the valve core and is arranged at the two ends of the valve core, the air outlet of the air pipe is connected with the inner cavity of the pressure chamber, a switch valve body is arranged on the air pipe, a switch rod for blocking the switch valve body is arranged on the inner wall of the switch valve body, a plurality of first sealing rings are fixed on the outer wall of the switch rod, and a return piece is arranged between the first sealing rings and the inlet of the switch valve body, so that the valve core can be returned. The application has the effect that the gas source control valve can be used in an environment without power supply, the use scene is not fixed, and the gas source control valve can be used in various environments.

Description

Technical Field

[0001] This application relates to the field of control valve technology, and in particular to a gas source control valve. Background Technology

[0002] With the development of society, many technologies utilize air sources to drive the operation of various equipment. Air source control valves refer to various pneumatic components that control the pressure, flow rate, and flow direction of airflow in pneumatic systems and ensure the normal operation of pneumatic actuators or mechanisms.

[0003] Currently, most gas source control valves control the on and off of the gas source through solenoid valves. When controlling the on and off of the gas source through solenoid valves, it is necessary to energize the solenoid valve. This is suitable for use in fixed locations with power supply, but it has the problem of limited application environments and needs improvement. Summary of the Invention

[0004] In order to avoid controlling the power supply of the gas source control valve by connecting the power supply, and to enable the control of the gas supply of the gas source control valve in an environment without power, this application provides a gas source control valve.

[0005] This application provides a gas source control valve, which adopts the following technical solution:

[0006] A gas source control valve includes a valve housing and a valve core slidably connected within the inner cavity of the valve housing. An air inlet and an air outlet are provided on the side wall of the valve housing.

[0007] A pressure chamber is disposed within the valve body, and the pressure chamber is in a closed state.

[0008] A vent pipe, wherein the outlet of the vent pipe and the pressure chamber are both located in the sliding direction of the valve core and are respectively located at both ends of the valve core, and the outlet of the vent pipe is connected to the inner cavity of the pressure chamber;

[0009] A switch valve body is disposed on the vent pipe. A switch rod for sealing the switch valve body is disposed on the inner wall of the switch valve body. A plurality of first sealing rings are fixed on the outer wall of the switch rod. The inlet of the switch valve body is located between the first sealing rings.

[0010] A return element is used to return the valve core to its original position.

[0011] By adopting the above technical solution, the air inlet is connected to an external air source. The external air source enters the inner cavity of the valve body through the air inlet. The valve core blocks the air outlet. The gas flows along the vent pipe to the switch valve body. The switch rod blocks the inner cavity of the switch valve body. Under the action of the first sealing ring, the air source cannot flow into the pressure chamber. At this time, the air source control valve is in the open state. When the operator pulls the switch rod, the switch rod moves the first sealing ring, causing the first sealing ring to slide away from the connection between the vent pipe and the switch valve body. This allows the gas entering the vent pipe to enter the switch valve body and then flow into the pressure chamber. As the gas in the pressure chamber increases, the valve core slides, the air outlet opens, and the gas entering the inner cavity of the valve body flows out from the air outlet, forming a passage to drive other equipment to work. After the gas supply is completed, the switch rod is pushed to block the vent pipe. Under the action of the return component, the valve core returns to its original position, blocking the air outlet. Operators can manually slide the switch lever to turn the gas supply on and off to the gas source control valve, thus avoiding the inability to control the gas source control valve in environments without power, thereby solving the problem of the gas source control valve being used in a limited range of environments.

[0012] Optionally, a second sealing ring is fixed at both ends of the valve core, and an air passage is provided on the inner wall of the valve housing. The air passage is connected to the air inlet, and the air outlet of the air passage is located between the two second sealing rings.

[0013] By adopting the above technical solution, part of the gas entering the valve body enters the vent pipe, and the other part of the gas enters the air passage. The setting of the second sealing ring improves the sealing between the valve body and the valve core, thereby making the airtightness of the air source control valve better and reducing the possibility of air leakage at the outlet when the air source control valve is in the closed state.

[0014] Optionally, several connectors are fixed on the side walls of both the switch valve body and the switch valve housing, and a tower is fixed on the outer wall of each connector. The tower is snapped into and fixed to the inner wall of the vent pipe.

[0015] By adopting the above technical solution, the staff inserts the end of the vent pipe into the outer wall of the connector. At this time, the outer wall of the tower abuts against the inner wall of the vent pipe. The connector facilitates the connection of the vent pipe, and the tower limits the connection between the connector and the vent pipe, making the connection between the connector and the vent pipe more stable and reducing the possibility of the vent pipe detaching from the connector.

[0016] Optionally, both ends of the switch valve body are open. The switch rod is located at one end of the switch valve body, and a snap-fit ​​groove is provided on the inner wall of the other end of the switch valve body. A spare head is snap-fitted and fixed at the end of the switch valve body away from the switch rod. A locking block is fixed at one end of the air inlet of the spare head. The locking block is snap-fitted and fixed to the inner wall of the snap-fit ​​groove. An elastic element is provided on the inner wall of the switch valve body to return the switch rod to its original position. One end of the elastic element abuts against the end of the switch rod, and the other end abuts against the side wall of the locking block.

[0017] By adopting the above technical solution, the elastic element is compressed when the operator presses the switch lever, and rebounds when the gas source control valve is closed, causing the switch lever to slide, thus making the sliding of the switch lever easier; the engagement between the locking block and the inner wall of the locking groove fixes the spare head and the switch valve body, and the abutment between the elastic element and the side wall of the locking block makes the engagement between the locking block and the inner wall of the locking groove more stable, thus making the fixation of the spare head and the switch valve body more stable; the setting of the spare head facilitates the discharge of gas in the vent pipe on the one hand, and facilitates the connection of external gas pipes to introduce gas to other equipment on the other hand.

[0018] Optionally, a balance chamber is formed on the inner wall of the valve housing. The balance chamber is located at the end of the valve core away from the pressure chamber. A fixing plate is fixed on the outer wall of the valve core. A sixth sealing ring is snapped onto the outer wall of the fixing plate. The fixing plate slides on the inner wall of the balance chamber. The outer wall of the sixth sealing ring abuts against the inner wall of the balance chamber. A cylinder is fixed at the end of the switch valve body away from the switch rod. An air extraction block is slidably connected to the inner wall of the cylinder. The air extraction block is connected to the switch rod. A conduit is connected to the side wall of the cylinder. The conduit is connected to the balance chamber. The connection point between the conduit and the cylinder is located between the switch rod and the air extraction block.

[0019] By adopting the above technical solution, when the operator opens the gas source control valve, the switch rod is pulled to slide. The switch rod drives the suction block to slide, and the suction block slides inside the cylinder, drawing the gas from the conduit and the balance chamber into the cylinder. This reduces the gas pressure in the balance chamber, making it lower than the gas pressure in the pressure chamber, thus making the valve core slide more conveniently. The cylinder draws gas from the balance chamber, causing the fixed plate to slide within the balance chamber, which in turn drives the valve core to slide. The sixth sealing ring seals the space between the fixed plate and the inner wall of the balance chamber, thereby reducing the possibility of air leakage in the balance chamber.

[0020] Optionally, the pressure chamber is smaller than the size of the balance chamber.

[0021] By adopting the above technical solution, since the air pressure in the balance chamber is less than the air pressure in the pressure chamber after the switch lever is pressed, the size of the valve body near the pressure chamber is reduced during the production of the air source control valve, thus reducing the size of the pressure chamber and making the air source control valve smaller and more compact in structure.

[0022] Optionally, a traction rod is fixed to the end of the switch rod, the traction rod is fixedly connected to the air extraction block, a through hole is opened on the side wall of the cylinder, the traction rod passes through the through hole, a third sealing ring is fixed on the inner wall of the through hole, and the inner wall of the third sealing ring abuts against the outer wall of the traction rod.

[0023] By adopting the above technical solution, when the operator presses the switch rod, the switch rod moves the traction rod. The traction rod slides in the through hole, and the traction rod moves the air extraction block. The setting of the third sealing ring makes the sealing between the traction rod and the inner wall of the through hole better, thereby improving the sealing between the cylinder and the traction rod.

[0024] Optionally, a fourth sealing ring is fixed on the outer wall of the valve core, the fourth sealing ring is located at one end near the pressure chamber, and the outer wall of the fourth sealing ring abuts against the inner wall of the valve body.

[0025] By adopting the above technical solution, the fourth sealing ring improves the sealing performance between the valve core end and the inner wall of the valve body, thus improving the sealing performance of the pressure chamber and reducing the outflow of gas from the pressure chamber through the gap between the valve core and the inner wall of the valve body.

[0026] Optionally, a plug hole is provided on the side wall of the valve body, and a pin is inserted and fixed in the plug hole. The pin is inserted and fixed at both the air inlet and the air outlet.

[0027] By adopting the above technical solution, the staff inserts the external air tube into the air inlet or outlet, and then inserts the pin into the plug hole to connect the external air tube to the valve body, making the connection of the external air tube more convenient.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The operator installs the gas source control valve on the equipment. When gas needs to be introduced into the equipment, the switch lever is pressed. The gas to be supplied to other equipment first enters the valve body through the inlet. A portion of the gas enters the valve body through the vent pipe, and then enters the pressure chamber. Under the pressure of the gas in the pressure chamber, the valve core is driven to slide, connecting the outlet and the inlet, thus opening the gas source control valve. The gas that entered the valve body flows out through the outlet to other equipment. No electricity is required, and the gas source control valve can be turned on and off in any environment, thereby improving the practicality of the gas source control valve.

[0030] 2. The operator inserts the locking block into the locking groove to fix the spare head. The elastic force of the elastic element makes the fixing of the locking block to the inner wall of the locking groove more stable. The spare head is set up to facilitate the discharge of gas in the vent pipe and the switch valve, and also to facilitate the operator to connect to other external air pipes.

[0031] 3. When the operator presses the locking lever, the suction block slides. The suction block slides inside the cylinder, drawing the gas in the balance chamber towards the cylinder. This reduces the gas pressure in the balance chamber, making the gas pressure in the balance chamber lower than the gas pressure in the pressure chamber, thus creating a pressure difference that facilitates the sliding of the valve core. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the gas source control valve in Embodiment 1 of this application.

[0033] Figure 2 This is a cross-sectional view of a gas source control valve according to an embodiment of this application, used to show the structure inside the gas source control valve cavity.

[0034] Figure 3 This is a schematic diagram of the overall structure of the gas source control valve in Embodiment 2 of this application.

[0035] Figure 4 This is a cross-sectional view of the gas source control valve in Embodiment 2 of this application, used to show the structure inside the gas source control valve cavity.

[0036] Reference numerals: 1. Valve housing; 2. Valve core; 3. Air inlet; 4. Air outlet; 5. Pressure chamber; 6. Vent pipe; 7. Switch valve body; 8. Switch rod; 9. First sealing ring; 10. Return component; 11. Second sealing ring; 12. Air passage; 13. Connector; 14. Tower; 15. Snap-fit ​​groove; 16. Spare head; 17. Locking block; 18. Elastic element; 19. Balance chamber; 20. Cylinder; 21. Air extraction block; 22. Conduit; 23. Traction rod; 24. Third sealing ring; 25. Fourth sealing ring; 26. Insertion hole; 27. Pin; 28. Fifth sealing ring; 29. ​​Mounting block; 30. Fixing plate; 31. Sixth sealing ring. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0038] This application discloses a gas source control valve.

[0039] Example 1:

[0040] Reference Figure 1 and Figure 2A gas source control valve includes a valve housing 1 and a valve core 2 that slides within the inner cavity of the valve housing 1. An air inlet 3 and an air outlet 4 are provided on the side wall of the valve housing 1, and the air inlet 3 and the air outlet 4 are arranged opposite to each other. An air passage 12 is provided on the inner wall of the valve housing 1, and the opening of the air passage 12 connects the air inlet 3 and the air outlet 4. The valve core 2 blocks the inner cavity of the valve housing 1, thereby controlling the opening and closing of the gas source control valve.

[0041] Reference Figure 2 A connector 13 is threaded onto the side wall of valve housing 1. The connector 13 is located near the air inlet 3. A connector 13 is also threaded onto the side wall of valve core 2. A vent pipe 6 is snapped onto the outer wall of the connector 13. A switch valve body 7 is provided at the end of the vent pipe 6 away from valve housing 1. Two connectors 13 are also threaded onto the side wall of the switch valve body 7. A tower 14 is welded onto the outer wall of each connector 13. The operator snaps the end of the vent pipe 6 away from valve housing 1 onto the outer wall of the connector 13 on the switch valve body 7. The outer wall of the tower 14 abuts against the inner wall of the vent pipe 6. The tower 14 serves as a limit, reducing the possibility of the vent pipe 6 detaching from the connector 13.

[0042] Reference Figure 2 Both ends of the switch valve body 7 are open. A switch rod 8 is slidably connected to the inner wall of the switch valve body 7. Two slots are opened on the outer wall of the switch rod 8. A first sealing ring 9 is fixedly engaged on the inner wall of each slot. In this application, the first sealing ring 9 is preferably made of rubber. The first sealing ring 9 abuts against the inner wall of the switch valve body 7. The outlet 4 of the vent pipe 6 located at one end of the air inlet 3 is located between the two first sealing rings 9. The gas entering the air inlet 3 enters the switch valve body 7 through the vent pipe 6. The gas stops flowing under the blockage of the two first sealing rings 9. When the operator presses the switch rod 8, the switch rod 8 drives the first sealing ring 9 to slide, so that the two connectors 13 on the switch valve body 7 are located between the two first sealing rings 9, thereby allowing the gas entering the switch valve body 7 to continue to flow.

[0043] Reference Figure 2 A snap-fit ​​groove 15 is provided on the inner wall of the switch valve body 7. The snap-fit ​​groove 15 is located at the end of the switch valve body 7 away from the switch rod 8. A spare head 16 is snap-fitted and fixed on the switch valve body 7. A locking block 17 is welded and fixed to the outer wall of the spare head 16. The locking block 17 snaps and fixes to the inner wall of the snap-fit ​​groove 15, thereby fixing the spare head 16 to the switch valve body 7. The spare head 16 is provided to facilitate gas discharge and to facilitate the connection of external gas pipes, so as to supply gas to more equipment.

[0044] Reference Figure 2The inner wall of the switch valve body 7 is provided with a return member 10 to return the switch rod 8 to its original position. In this application, the return member 10 is preferably a spring. One end of the return member 10 abuts against the end of the switch rod 8, and the other end abuts against the outer wall of the locking block 17. When the operator presses the switch rod 8, the return member 10 is compressed. After the gas supply is completed, the switch rod 8 returns to its original position under the action of the return member 10's own elastic force. Under the action of the return member 10's own elastic force, a force is applied to the locking block 17, making the locking block 17 and the inner wall of the locking groove 15 more stable, thereby making the connection between the spare head 16 and the switch valve body 7 more stable.

[0045] Reference Figure 2 The valve core 2 is hollow. The connector 13 on the outer wall of the valve core 2 is connected to the inner cavity of the valve core 2. The inner wall of the valve body 1 is provided with a pressure chamber 5, which is connected to the inner cavity of the valve core 2. When the operator presses the switch lever 8, part of the gas entering the inner cavity of the valve body 1 enters the switch valve body 7 through the vent pipe 6, and then enters the pressure chamber 5 through the vent pipe 6 and the inner cavity of the valve core 2. Under the pressure of the pressure chamber 5, the valve core 2 is driven to slide in the inner cavity of the valve body 1, so that the air inlet 3 on the side wall of the valve body 1 is connected to the air outlet 4.

[0046] Reference Figure 2 The outer wall of the valve core 2 has several slots. In this application, three slots are preferably provided. Two of the slots have a second sealing ring 11 fixedly engaged on their inner walls, and a fourth sealing ring 25 is fixedly engaged in the other slot. The fourth sealing ring 25 is located at the end near the pressure chamber. Both the second sealing ring 11 and the fourth sealing ring 25 are preferably made of rubber. The fourth sealing ring 25 is provided to seal the pressure chamber, ensuring that the pressure chamber and the inner wall of the valve body 1 are always in a sealed state.

[0047] Reference Figure 2 A fixing groove is provided on the inner wall of the valve body 1, and a fifth sealing ring 28 is fixedly engaged on the inner wall of the fixing groove. The fifth sealing ring 28 is preferably located between two second sealing rings 11, and the fifth sealing ring 28 is preferably made of rubber. When the fourth sealing ring 25 is located in the pressure chamber, part of the gas entering the inlet 3 can only flow between the second sealing ring 11 and the fifth sealing ring 28. At this time, the gas source controller is in the closed state. When the pressure in the pressure chamber drives the valve core 2 to slide, the second sealing ring 11 near the fourth sealing ring 25 slides past the inlet 3 and the outlet 4. At this time, the gas entering the inlet 3 flows out of the outlet 4 through the inner cavity of the valve body 1 and is directed to the external equipment.

[0048] Reference Figure 2The outer wall of the valve core 2 is provided with an elastic element 18 for returning the valve core 2 to its original position. In this application, the elastic element 18 is preferably a spring. One end of the elastic element 18 abuts against the inner wall of the valve housing 1, and the other end abuts against the outer wall of the valve core 2. During the process of the valve core 2 sliding away from the inner cavity of the pressure chamber, the elastic element 18 contracts. After the gas is vented to the external equipment, the valve core 2 slides back to the initial position under the action of the elastic element 18's own rebound force, thus blocking the gas entering the valve housing 1.

[0049] Reference Figure 2 The valve housing 1 has insertion holes 26 at the air inlet 3 and air outlet 4. A pin 27 is inserted and fixed on the inner wall of the insertion hole 26. The operator inserts the external air pipe into the air inlet 3 and air outlet 4, inserts the pin 27 into the insertion hole 26, and the pin 27 is fixed to the valve housing 1 by the nut. The external air pipe is fixed to the valve housing 1 by the clamping of the pin 27, which makes the fixing of the external air pipe to the valve housing 1 easier.

[0050] According to Embodiment 1 of this application, the implementation principle of a gas source control valve is as follows: The operator inserts an external air pipe into the air inlet 3, inserts the air inlet pipe of the equipment to be inflated into the air outlet 4, inserts a pin 27 into the insertion hole 26, and installs the gas source control valve under the limiting position of the pin 27. Gas is filled into the air inlet 3 of the valve body 1. Part of the gas enters the two first sealing rings 9 in the switch valve body 7 through the vent pipe 6, and the other part of the gas enters the two second sealing rings 11 and the fifth sealing ring 28. At this time, the gas source control valve is in the closed state. The operator presses the switch lever 8, the elastic element 18 is compressed, and part of the gas that entered the air inlet 3 enters the valve body 1 and then enters the pressure chamber 5 along the vent pipe 6 and the inner cavity of the valve core 2. The pressure in the pressure chamber 5 drives the valve core 2 to slide upward, so that the air inlet 3 and the air outlet 4 are connected. At this time, the gas enters through the air inlet 3 and flows to the external equipment through the air outlet 4. No power supply is required; operators can manually control the gas supply to and from the gas source by operating the gas source control valve in any environment, thereby improving the practicality of the gas source control valve.

[0051] Example 2:

[0052] Example 2 differs from Example 1 in that: (Refer to...) Figure 3 and Figure 4A cylinder 20 is fixed to the end of the valve body 7 away from the switch rod 8 by screws. A through hole is opened on the side wall of the end of the cylinder 20 near the switch rod 8. The end of the cylinder 20 away from the switch rod 8 is open. An air extraction block 21 is slidably connected to the inner wall of the cylinder 20. In this application, the air extraction block 21 is preferably made of rubber and is cylindrical. The air extraction block 21 is press-fitted with the inner wall of the cylinder 20. A groove is opened on the inner wall of the through hole. A third sealing ring 24 is snapped and fixed on the inner wall of the groove. In this application, the third sealing ring 24 is preferably made of rubber. The inner wall of the third sealing ring 24 abuts against the outer wall of the traction rod 23. The third sealing ring 24 seals the traction rod 23 and the inner wall of the through hole, reducing the possibility of gas leakage.

[0053] Reference Figure 4 A traction rod 23 is welded and fixed to one end of the switch rod 8 near the cylinder 20. The traction rod 23 is fixed to the side wall of the suction block 21 through the through hole by screws. When the operator presses the switch rod 8, the traction rod 23 moves and the suction block 21 slides inside the cylinder 20.

[0054] Reference Figure 4 A conduit 22 is connected to the side wall of the cylinder 20, and the connection between the conduit 22 and the cylinder 20 is located between the suction block 21 and the switch rod 8; an mounting block 29 is welded and fixed to the inner wall of the valve body 1, and a balance chamber 19 is opened on the side wall of the mounting block 29; a fixing plate 30 is welded and fixed to the outer wall of the valve core 2, and a sixth sealing ring 31 is snapped and fixed to the outer wall of the fixing plate 30; both the fixing plate 30 and the sixth sealing ring 31 slide within the balance chamber 19; the elastic element 18... One end of the conduit 22 abuts against the inner wall of the balance chamber 19, and the other end abuts against the side wall of the fixed plate 30. The end of the conduit 22 away from the switch valve body 7 is connected to the inner wall of the balance chamber 19. When the switch lever 8 is pressed, the gas in the balance chamber 19 is drawn into the cylinder 20 as the air extraction block 21 slides in the cylinder 20, which reduces the gas pressure in the balance chamber 19 and applies a sliding motion to the valve core 2 towards the mounting block 29, thereby making the sliding of the valve core 2 easier.

[0055] Reference Figure 4 During the production of the gas source control valve, the staff appropriately reduced the size of the valve body 1 located at one end of the pressure chamber, thereby reducing the size of the pressure chamber and making the gas source control valve smaller and more compact in structure.

[0056] According to Embodiment 2 of this application, the implementation principle of a gas source control valve is as follows: When the operator presses the switch lever 8, the air extraction block 21 slides, and part of the gas in the balance chamber 19 is drawn into the cylinder 20, which reduces the gas pressure in the balance chamber 19. Under the action of the pressure in the pressure chamber and the pressure in the balance chamber 19, the valve core 2 slides, and the gas entering the air inlet 3 flows to the external equipment through the air outlet 4.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gas source control valve, comprising a valve housing (1) and a valve core (2) slidably connected within the inner cavity of the valve housing (1), wherein an air inlet (3) and an air outlet (4) are provided on the side wall of the valve housing (1), characterized in that: Also includes Pressure chamber (5) is disposed inside the valve body (1), and the pressure chamber (5) is in a closed state; Vent pipe (6), the air outlet of the vent pipe (6) and the pressure chamber (5) are both located in the sliding direction of the valve core (2) and are respectively located at both ends of the valve core (2). The air outlet of the vent pipe (6) is connected to the inner cavity of the pressure chamber (5). A switch valve body (7) is provided on the vent pipe (6). A switch rod (8) for sealing the switch valve body (7) is provided on the inner wall of the switch valve body (7). Several first sealing rings (9) are fixed on the outer wall of the switch rod (8). The inlet of the switch valve body (7) is located between the first sealing rings (9). A spare head (16) is snapped and fixed at one end of the switch valve body (7) away from the switch rod (8). The spare head (16) is provided to facilitate the discharge of gas and the connection of external air pipes. An elastic element (18) is used to return the valve core (2) to its original position; The valve core (2) is hollow. The connector (13) on the outer wall of the valve core (2) is connected to the inner cavity of the valve core (2). A pressure chamber (5) is opened on the inner wall of the valve shell (1). The pressure chamber (5) is connected to the inner cavity of the valve core (2). When the operator presses the switch lever (8), part of the gas entering the inner cavity of the valve shell (1) enters the switch valve body (7) through the vent pipe (6), and then enters the pressure chamber (5) through the vent pipe (6) and the inner cavity of the valve core (2). Under the pressure of the pressure chamber (5), the valve core (2) is driven to slide in the inner cavity of the valve shell (1), so that the air inlet (3) on the side wall of the valve shell (1) is connected to the air outlet (4).

2. The gas source control valve according to claim 1, characterized in that: The valve core (2) is fixed with a second sealing ring (11) at both ends. An air passage (12) is provided on the inner wall of the valve body (1), and the air passage (12) is connected to the air inlet (3).

3. The gas source control valve according to claim 1, characterized in that: Several connectors (13) are fixed on the side walls of the switch valve body (7) and the valve shell (1). A tower (14) is fixed on the outer wall of each connector (13). The tower (14) is snapped and fixed to the inner wall of the vent pipe (6).

4. A gas source control valve according to claim 3, characterized in that: Both ends of the switch valve body (7) are open. The switch rod (8) is located at one end of the switch valve body (7). A snap-fit ​​groove (15) is provided on the inner wall of the other end of the switch valve body (7). A snap-fit ​​block (17) is fixed at one end of the air inlet of the spare head (16). The snap-fit ​​block (17) is snapped and fixed to the inner wall of the snap-fit ​​groove (15). A return member (10) is provided on the inner wall of the switch valve body (7) for returning the switch rod (8) to its original position. One end of the return member (10) abuts against the end of the switch rod (8), and the other end abuts against the side wall of the snap-fit ​​block (17).

5. A gas source control valve according to claim 1, characterized in that: A balance chamber (19) is provided on the inner wall of the valve housing (1). The balance chamber (19) is located at the end of the valve core (2) away from the pressure chamber (5). A fixing plate (30) is fixed on the outer wall of the valve core (2). A sixth sealing ring (31) is snapped onto the outer wall of the fixing plate (30). The fixing plate (30) slides on the inner wall of the balance chamber (19). The outer wall of the sixth sealing ring (31) abuts against the inner wall of the balance chamber (19). The switch valve A cylinder (20) is fixed to one end of the body (7) away from the switch rod (8). An air extraction block (21) is slidably connected to the inner wall of the cylinder (20). The air extraction block (21) is connected to the switch rod (8). A conduit (22) is connected to the side wall of the cylinder (20). The conduit (22) is connected to the balance chamber (19). The position where the conduit (22) is connected to the cylinder (20) is between the switch rod (8) and the air extraction block (21).

6. A gas source control valve according to claim 5, characterized in that: The pressure chamber (5) is smaller than the balance chamber (19).

7. A gas source control valve according to claim 6, characterized in that: The end of the switch rod (8) is fixed with a traction rod (23), the traction rod (23) is fixedly connected to the air extraction block (21), a through hole is opened on the side wall of the cylinder (20), the traction rod (23) passes through the through hole, a third sealing ring (24) is fixed on the inner wall of the through hole, and the inner wall of the third sealing ring (24) abuts against the outer wall of the traction rod (23).

8. A gas source control valve according to claim 1, characterized in that: A fourth sealing ring (25) is fixed on the outer wall of the valve core (2). The fourth sealing ring (25) is located at one end close to the pressure chamber (5), and the outer wall of the fourth sealing ring (25) abuts against the inner wall of the valve body (1).

9. A gas source control valve according to claim 1, characterized in that: The valve housing (1) has a plug hole (26) on its side wall, and a pin (27) is inserted and fixed in the plug hole (26). The pin (27) is also inserted and fixed at the air inlet (3) and air outlet (4) on the side wall of the valve housing (1).

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