Pressure stabilizing inflation valve and method

Abstract

The invention discloses a pressure stabilizing inflation valve and method, and belongs to the field of inflation valves. The inflation valve comprises a shell, an inflation port, an exhaust port, a control port, a valve element rod and a piston, wherein the inflation port, the exhaust port and the control port are located in the shell; a gas flowing cavity, a balance cavity and a control cavity are sequentially formed in the shell in the axial direction, the gas flowing cavity is communicated with the balance cavity through a convergence opening, and the balance cavity is communicated with the control cavity through a piston guide hole. The inflation port is communicated with the balance cavity, the exhaust port is communicated with the gas flowing cavity, and the control port is communicated with the control cavity; the end faces, facing the balance cavity, of the valve element rod and the piston are pressure-bearing faces, the area of the pressure-bearing face of the valve element rod is smaller than that of the pressure-bearing face of the piston, and when the inflation port injects high-pressure gas into the balance cavity, resultant force generated by the difference of the pressure-bearing faces of the valve element rod and the piston acts on the piston so as to guarantee that the inflation valve cannot be opened when the control port is in a non-working state. The problem that inflation of an existing inflation valve is not controlled is solved, and the accuracy of gas flow control is improved.

Description

Technical Field

[0001] The invention belongs to the field of inflation valves, and in particular relates to a pressure-stabilizing inflation valve and a method. Background Art

[0002] As a key component of the inflatable equipment, the principle and working mechanism of the inflation valve have an important impact on the performance and stability of the inflatable equipment. The principle of the inflation valve mainly involves two aspects, one is the principle of gas flow, and the other is the working principle of the valve; first, the principle of gas flow is that the inflation valve can control the flow of gas so that it can be inflated or exhausted in the required direction and speed; second, the working principle of the valve is to achieve control and regulation of gas flow through the coordination of components such as the valve core, valve seat and sealing ring. Therefore, the precise control of gas flow and the requirements for gas sealing performance are the main considerations when designing an inflation valve.

[0003] like Figure 1 As shown, the conventional manual inflation valve is composed of a main valve flap 1, a relief valve flap 2, a nut 3, a spring 4, a housing 5, and a screw 6. In normal operation, the valve is opened or closed by rotating the screw 6: when inflating, high-pressure gas enters port A, and the main valve flap 1 and the relief valve flap 2 are pressed close to the nut 3 by rotating the screw 6, so that the gas flows through the valve; when deflation, high-pressure gas enters port B, and the main valve flap 1 and the relief valve flap 2 are pressed close to the nut 3 by rotating the screw 6, so that the gas flows through the valve; when closing the valve, the screw 6 is rotated in the opposite direction to release the pressure on the main valve flap 1 and the relief valve flap 2. This valve controls the stroke of the valve core manually, which will cause the problem of low gas flow control precision. At the same time, under the set inflation pressure, the air pressure is not enough to overcome the spring force. When the air pressure rushing into port A is greater than the set air pressure, due to the determination of the spring, the rushing air pressure is greater than the spring force, which pushes open the main valve disc 1 and the unloading valve disc 2, resulting in uncontrolled inflation, which further affects the precise control of gas flow.

[0004] like Figure 2 As shown, the pneumatically controlled inflation valve includes a push rod 9, a piston valve disc 7, a nut 3, a spring 4, a shell 5, and a pipe nozzle 8. The control gas is introduced through the pipe nozzle 6. By adjusting the pressure of the control gas, the control accuracy problem of the manual inflation valve due to manual operation can be overcome; however, when the pressure of the air rushed into the A port is greater than the set pressure, due to the determination of the spring, the piston valve disc 7 will also be pushed open due to the pressure being greater than the spring force, resulting in uncontrolled inflation, further affecting the precise control of the gas flow. Summary of the invention

[0005] Technical issues to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present invention provides a pressure-stabilizing inflation valve and method, which designs the inner cavity structure of the valve body and the position of the exhaust port, and combines the pressure area difference between the valve core rod and the piston, so that when the inflation pressure of port A is greater than the set pressure, the sealing of the valve closure is guaranteed, and the opening and closing of the valve and the flow rate are only regulated by the control gas. Therefore, the present invention solves the problem of uncontrolled inflation of the existing inflation valve and improves the accuracy of gas flow control.

[0007] The technical solution of the present invention is: a pressure-stabilizing inflation valve, comprising a housing, an inflation port, an exhaust port, a control port on the housing, a valve core rod and a piston in the housing; characterized in that: a gas flow chamber, a balance chamber, and a control chamber are sequentially arranged in the housing along the axial direction, the gas flow chamber and the balance chamber are connected through a convergent port, and the balance chamber and the control chamber are connected through a piston guide hole; the inflation port is connected to the balance chamber, the exhaust port is connected to the gas flow chamber, and the control port is connected to the control chamber;

[0008] One end of the valve core rod is located in the flow cavity, and the gas between the balance cavity and the control cavity is blocked by the limit of the convergent port, and the other end passes through the convergent port and the balance cavity in sequence and is fixedly connected to the piston; the rod of the piston coaxially passes through the piston guide hole in the form of a dynamic seal, and its head is installed in cooperation with the inner wall of the control cavity in the form of a dynamic seal; the spring is sleeved on the rod of the piston, one end of which abuts against the piston head, and the other end abuts against the inner wall of the control cavity;

[0009] The end faces of the valve core rod and the piston facing the balance chamber are pressure-bearing surfaces. The pressure-bearing surface area of ​​the valve core rod is smaller than the pressure-bearing surface area of ​​the piston. When the inflation port injects high-pressure gas into the balance chamber, the resultant force generated by the pressure-bearing area difference between the valve core rod and the piston acts on the piston to ensure that the inflation valve will not be opened when the control port is not in a working state.

[0010] A further technical solution of the present invention is: the valve core rod is a T-rod structure, one end of which is a disc and the other end is a straight rod, and an external thread is opened on the head of the straight rod; the outer diameter of the disc is larger than the inner diameter of the convergent port, and the axial displacement of the disc is limited in the gas flow cavity through the convergent port.

[0011] A further technical solution of the present invention is that a wrench groove is provided at the center of the outer end surface of the disc of the valve core rod to facilitate installation.

[0012] A further technical solution of the present invention is: the piston is a T-shaped rotating body, the circumferential outer edge of its head extends axially toward its rod, the outer circumferential surface of the extended part and the inner wall of the control chamber are clearance-matched, and relative displacement can be generated, and the inner circumferential surface of the extended part forms an annular groove with its rod; an internal thread is opened at the center of the bottom end of the rod, which is installed in conjunction with the external thread of the valve core rod to complete a fixed connection.

[0013] A further technical solution of the present invention is that sealing ring installation grooves are provided on the outer peripheral surfaces of the head and the rod of the piston, and dynamic sealing connections with the control chamber and the guide hole are achieved by installing sealing rings.

[0014] A further technical solution of the present invention is that: the inner peripheral profile of the control cavity of the housing is consistent with the outer peripheral profile of the piston head, so that the piston moves axially along the inner wall of the control cavity under the action of the control airflow or the spring;

[0015] The guide hole between the balance chamber and the control chamber extends into the control chamber, and the radial height of the extended portion of the guide hole is smaller than the radial height of the piston annular groove. When the piston moves until its annular groove abuts against the extended portion of the guide hole, the axial movement stroke of the piston can be limited, thereby limiting the maximum flow rate of the inflation valve;

[0016] Alternatively, a limiting boss is provided on the inner circumferential surface of the control chamber to limit the axial movement stroke of the piston.

[0017] A further technical solution of the present invention is: an annular sealing protrusion is arranged on the orifice end face of the shell convergence port located in the gas flow cavity; an annular dovetail groove is opened on the inner end face of the valve core rod disc along the circumferential direction, and sealing material is filled in the annular dovetail groove; the valve sealing port is formed by the annular sealing protrusion and the sealing material in the annular dovetail groove.

[0018] A further technical solution of the present invention is that the control cavity of the housing is an open structure, the open end of which is sealed and connected to the nut through a thread, and the central through hole on the nut serves as a control port to connect with the nozzle.

[0019] A method for inflating a pressure-stabilizing gas cylinder inflation valve, characterized in that the specific steps are as follows:

[0020] Introduce gas into the balance chamber in the shell through the inflation port;

[0021] The control gas is introduced into the control chamber in the housing through the control port, and the pressure generated by the control gas pushes the piston and the valve core rod to move toward the gas flow chamber to open the valve;

[0022] The gas in the balance chamber enters the gas flow chamber through the valve sealing port, and then enters the container to be filled from the exhaust port;

[0023] When inflation is completed, the inflation port is closed, the control gas is evacuated, the spring pushes the piston to return, and the valve sealing port is closed.

[0024] A method for exhausting an inflation valve of a pressure-stabilizing gas cylinder, characterized in that the specific steps are as follows:

[0025] introducing gas into the gas flow cavity in the shell through the exhaust port;

[0026] The control gas is introduced into the control chamber in the housing through the control port, and the pressure generated by the control gas pushes the piston and the valve core rod to move in the direction of the gas flow chamber to open the valve;

[0027] The gas in the gas flow chamber enters the balance chamber through the valve sealing port and is then discharged from the inflation port;

[0028] When exhaust is completed, the exhaust port is closed, the control gas is evacuated, the spring pushes the piston to return, and the valve sealing port is closed.

[0029] Beneficial Effects

[0030] The beneficial effect of the present invention is that: the present invention utilizes the difference in pressure-bearing area between the valve core rod and the piston, and the pressure generated by the high-pressure gas entering the inflation port is mainly applied to the piston, thereby pressing the piston, so that the positions of the components in the valve housing are always in a balanced and stable state, avoiding the problem of high pressure destroying the balance, and thus solving the problem of uncontrolled inflation.

[0031] Compared with the traditional design method and structure, the spring of the present invention has two functions. One is to provide basic force when the valve is closed, so that the valve is tightly closed; the other is to drive the piston back to its original position after the control gas is withdrawn. This function reduces the number of valve components. The piston also pulls the valve core rod to move and gradually close the valve.

[0032] When using the valve of the present invention, high-pressure gas is injected into the inflation port before the valve is opened. There is a pressure-bearing area difference between the valve core rod and the pressure-bearing surface of the piston. The pressure-bearing area of ​​the left end surface of the piston is larger than the pressure-bearing area of ​​the valve core rod. The combined force formed by the pressure-bearing area difference shall not damage the valve parts, and the sealing material of the valve core rod is prevented from being cracked. The pressure-bearing area difference makes the high-pressure gas injected into the inflation port help the valve seal and will not push the valve open. The basic force provided by the spring plus the force generated by the pressure-bearing area difference are in the same direction, making the valve close more tightly, so that the gas source pressure of the inflation port can be higher; the opening of the valve has nothing to do with the gas source pressure of the inflation port. The valve has a wide gas source pressure range, and the gas source pressure is only limited by the mechanical properties of the valve assembly.

[0033] The valve design of the present invention makes the design and selection of the spring simple, and the force provided by the spring is sufficient as long as it is greater than the force driving the piston to return to the right position. The use pressure range of the valve is widened, the design and selection of the spring are simple, and the streamlined design of the parts improves the reliability of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of a manual inflation valve in the background technology;

[0035] Figure 2 It is a schematic diagram of the structure of a pneumatically controlled inflation valve in the background technology;

[0036] Figure 3 This is a schematic diagram of the structure of a pressure-stabilizing inflation valve of the present invention;

[0037] Figure 4 This is an enlarged view of a valve sealing port of a pressure-stabilizing inflation valve of the present invention.

[0038] Explanation of the accompanying drawings: 1. Main valve disc; 2. Unloading valve disc; 3. Nut; 4. Spring; 5. Housing; 6. Screw; 7. Piston valve disc; 8. Take-over nozzle; 9. Push rod; 10. Valve core rod; 11. Sealing ring; 12. Piston; 13. Control chamber; 14. Balance chamber; 15. Gas flow chamber. DETAILED DESCRIPTION

[0039] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] Based on the problem that the existing inflation valve may push open the valve sealing port due to excessive inflation pressure, thereby causing uncontrolled inflation, the present invention provides a pressure-stabilizing inflation valve, comprising a shell, an inflation port, an exhaust port, and a control port located on the shell, and a valve core rod and a piston located in the shell; a gas flow chamber, a balance chamber, and a control chamber are sequentially arranged in the shell along the axial direction, the gas flow chamber and the balance chamber are connected through a convergent port, and the balance chamber and the control chamber are connected through a piston guide hole; the inflation port is connected to the balance chamber, the exhaust port is connected to the gas flow chamber, and the control port is connected to the control chamber;

[0042] One end of the valve core rod is located in the flow cavity, and the gas between the balance cavity and the control cavity is blocked by the limit of the convergent port, and the other end passes through the convergent port and the balance cavity in sequence and is fixedly connected to the piston; the rod of the piston coaxially passes through the piston guide hole in the form of a dynamic seal, and its head is installed in cooperation with the inner wall of the control cavity in the form of a dynamic seal; the spring is sleeved on the rod of the piston, one end of which abuts against the piston head, and the other end abuts against the inner wall of the control cavity;

[0043] The end faces of the valve core rod and the piston facing the balance chamber are pressure-bearing surfaces. The pressure-bearing surface area of ​​the valve core rod is smaller than the pressure-bearing surface area of ​​the piston. When the inflation port injects high-pressure gas into the balance chamber, the resultant force generated by the pressure-bearing area difference between the valve core rod and the piston acts on the piston to ensure that the inflation valve will not be opened when the control port is not in a working state.

[0044] Specifically, the valve core rod is a T-rod structure, one end of which is a disc and the other end is a straight rod, and an external thread is opened on the head of the straight rod; the outer diameter of the disc is larger than the inner diameter of the convergent port, and the axial displacement of the disc is limited in the gas flow cavity through the convergent port.

[0045] Specifically, a wrench groove is provided at the center of the outer end surface of the disc of the valve core rod to facilitate installation.

[0046] Specifically, the piston is a T-shaped rotating body, the circumferential outer edge of its head extends axially toward its rod, the outer circumferential surface of the extended part and the inner wall of the control chamber are clearance-matched, and relative displacement can be generated, and the inner circumferential surface of the extended part forms an annular groove with its rod; an internal thread is opened at the center of the bottom end of the rod, which is installed in conjunction with the external thread of the valve core rod to complete a fixed connection.

[0047] Specifically, sealing ring installation grooves are provided on the outer circumferential surfaces of the head and the rod of the piston, and dynamic sealing connections with the control chamber and the guide hole are achieved by installing sealing rings.

[0048] Specifically, the inner peripheral surface of the control cavity of the housing is consistent with the outer peripheral surface of the piston head, so that the piston moves axially along the inner wall of the control cavity under the action of the control airflow or the spring;

[0049] The guide hole between the balance chamber and the control chamber extends into the control chamber, and the radial height of the extended portion of the guide hole is smaller than the radial height of the piston annular groove. When the piston moves until its annular groove abuts against the extended portion of the guide hole, the axial movement stroke of the piston can be limited, thereby limiting the maximum flow rate of the inflation valve;

[0050] Alternatively, a limiting boss is provided on the inner circumferential surface of the control chamber to limit the axial movement stroke of the piston.

[0051] Specifically, an annular sealing protrusion is provided on the orifice end face of the shell convergence port located in the gas flow chamber; an annular dovetail groove is opened on the inner end face of the valve core rod disc along the circumferential direction, and the annular dovetail groove is filled with sealing material; the valve sealing port is formed by the annular sealing protrusion and the sealing material in the annular dovetail groove.

[0052] Specifically, the control cavity of the shell is an open structure, and its open end is sealed and connected to the nut through a thread. The central through hole on the nut serves as a control port and is connected to the nozzle.

[0053] The present invention provides a method for inflating a pressure-stabilizing gas cylinder inflation valve, and the specific steps are as follows:

[0054] Step 1: Introduce gas into the balance chamber in the shell through the inflation port;

[0055] Step 2: Introduce control gas into the control chamber in the housing through the control port. The pressure generated by the control gas pushes the piston and the valve core rod to move toward the gas flow chamber to open the valve.

[0056] Step 3: The gas in the balance chamber enters the gas flow chamber through the valve sealing port, and then enters the container to be inflated from the exhaust port;

[0057] Step 4: After the inflation is completed, the inflation port is closed, the control gas is evacuated, the spring pushes the piston to return, and the valve sealing port is closed.

[0058] A method for exhausting an inflation valve of a pressure-stabilizing gas cylinder, the specific steps are as follows:

[0059] Step 1: introducing gas into the gas flow cavity in the shell through the exhaust port;

[0060] Step 2: Introduce control gas into the control chamber in the housing through the control port. The pressure generated by the control gas pushes the piston and the valve core rod to move toward the gas flow chamber to open the valve.

[0061] Step 3: The gas in the gas flow chamber enters the balance chamber through the valve sealing port and is then discharged from the inflation port;

[0062] Step 4: After exhaust is completed, the exhaust port is closed, the control gas is evacuated, the spring pushes the piston to return, and the valve sealing port is closed.

[0063] The above technical solution is further described below in conjunction with the accompanying drawings:

[0064] Reference Figure 3 As shown, a pressure-stabilizing inflation valve of the present invention comprises a housing 5, a valve core rod 10, a spring 4, a piston 12, a sealing ring 11, a nut 3, and a nozzle 8. A gas flow chamber 15, a balance chamber 14, and a control chamber 13 are sequentially arranged in the housing 5 along the axial direction. An annular sealing protrusion is provided in the contact area between the housing 5 and the end surface of the valve core rod 10, and an annular dovetail groove is provided in the corresponding area of ​​the valve core rod 10, which is filled with a sealing material with a certain elasticity. The annular sealing protrusion of the housing 5 and the sealing material in the dovetail groove form a sealing port.

[0065] The specific usage process is as follows:

[0066] Port A is used as the charging port to connect to the gas source, and port B is used as the exhaust port to connect to the gas cylinder for storing high-pressure gas.

[0067] When port A is connected to the gas source for inflation, the control gas enters from the nozzle 8, pushing the piston 12 to move to the left, driving the valve core rod 10, and the valve opens. The gas passes through the valve sealing port and enters the gas cylinder from port B. After inflation is completed, port A is closed, the control gas is evacuated, and the spring pushes the piston 12 to move to the right, driving the valve core rod 10, and the valve closes.

[0068] When the gas cylinder is deflated, the control gas enters from the nozzle 8, pushing the piston 12 to the left, driving the valve core rod 10, the valve opens, and the gas passes through the valve sealing port and is discharged from port A. When the deflation stops, port B is closed, the control gas is evacuated, the spring pushes the piston 12 to the right, driving the valve core rod 10, and the valve closes.

[0069] The nut 3 and the sealing parts at the left end realize the sealing of the left end, and the nut and the sealing parts at the right end realize the sealing of the right end. The outer diameter of the valve core rod 10 is smaller than the inner diameter of the left end of the housing 5, and the left end face of the valve core rod 10 has a wrench groove for easy installation. The two outer diameters of the piston 12 are equipped with sealing parts to prevent leakage of high-pressure gas.

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A pressure-stabilizing inflation valve, comprising a housing, an inflation port, an exhaust port, and a control port on the housing, and a valve core rod and a piston in the housing; characterized in that: The housing is provided with a gas flow chamber, a balance chamber, and a control chamber in sequence along the axial direction. The gas flow chamber and the balance chamber are connected through a convergent port, and the balance chamber and the control chamber are connected through a piston guide hole; the inflation port is connected with the balance chamber, the exhaust port is connected with the gas flow chamber, and the control port is connected with the control chamber; One end of the valve core rod is located in the flow cavity, and the gas between the balance cavity and the control cavity is blocked by the limit of the convergent port, and the other end passes through the convergent port and the balance cavity in sequence and is fixedly connected to the piston; the rod of the piston coaxially passes through the piston guide hole in the form of a dynamic seal, and its head is installed in cooperation with the inner wall of the control cavity in the form of a dynamic seal; the spring is sleeved on the rod of the piston, one end of which abuts against the piston head, and the other end abuts against the inner wall of the control cavity; The end faces of the valve core rod and the piston facing the balance chamber are pressure-bearing surfaces. The pressure-bearing surface area of ​​the valve core rod is smaller than the pressure-bearing surface area of ​​the piston. When the inflation port injects high-pressure gas into the balance chamber, the resultant force generated by the pressure-bearing area difference between the valve core rod and the piston acts on the piston to ensure that the inflation valve will not be opened when the control port is not in a working state.

2. A pressure-stabilizing inflation valve according to claim 1, characterized in that: The valve core rod is a T-rod structure, one end of which is a disc and the other end is a straight rod, and an external thread is opened on the head of the straight rod; the outer diameter of the disc is larger than the inner diameter of the convergent port, and the axial displacement of the disc is limited in the gas flow cavity through the convergent port.

3. A pressure-stabilizing inflation valve according to claim 2, characterized in that: A wrench groove is provided at the center of the outer end surface of the disc of the valve core rod for easy installation.

4. A pressure-stabilizing inflation valve according to claim 2, characterized in that: The piston is a T-shaped rotating body, and the circumferential outer edge of its head extends axially toward its rod. The outer circumferential surface of the extended part and the inner wall of the control chamber are clearance-matched, which can produce relative displacement. The inner circumferential surface of the extended part and its rod form an annular groove; an internal thread is opened at the center of the bottom end of the rod, which is installed in conjunction with the external thread of the valve core rod to complete a fixed connection.

5. A pressure-stabilizing inflation valve according to claim 4, characterized in that: The head and the outer circumferential surface of the rod of the piston are both provided with sealing ring installation grooves, and the dynamic sealing connection with the control cavity and the guide hole is achieved by installing sealing rings.

6. A pressure-stabilizing inflation valve according to claim 5, characterized in that: The inner peripheral profile of the control cavity of the housing is consistent with the outer peripheral profile of the piston head, so that the piston moves axially along the inner wall of the control cavity under the action of the control airflow or the spring; The guide hole between the balance chamber and the control chamber extends into the control chamber, and the radial height of the extended portion of the guide hole is smaller than the radial height of the piston annular groove. When the piston moves until its annular groove abuts against the extended portion of the guide hole, the axial movement stroke of the piston can be limited, thereby limiting the maximum flow rate of the inflation valve; Alternatively, a limiting boss is provided on the inner circumferential surface of the control chamber to limit the axial movement stroke of the piston.

7. A pressure-stabilizing inflation valve according to claim 2, characterized in that: The shell convergence port is located on the orifice end face of the gas flow cavity and is provided with an annular sealing protrusion; the inner end face of the valve core rod disc is circumferentially provided with an annular dovetail groove, and the annular dovetail groove is filled with sealing material; the valve sealing port is formed by the annular sealing protrusion and the sealing material in the annular dovetail groove.

8. A pressure-stabilizing inflation valve according to claim 1, characterized in that: The control cavity of the shell is an open structure, and its open end is sealed and connected with the nut through a thread. The central through hole provided on the nut serves as a control port and is connected with the pipe nozzle.

9. A method for inflating a pressure-stabilizing gas cylinder inflation valve according to any one of claims 1 to 8, characterized in that The specific steps are as follows: Introduce gas into the balance chamber in the shell through the inflation port; The control gas is introduced into the control chamber in the housing through the control port, and the pressure generated by the control gas pushes the piston and the valve core rod to move toward the gas flow chamber to open the valve; The gas in the balance chamber enters the gas flow chamber through the valve sealing port, and then enters the container to be filled from the exhaust port; When inflation is completed, the inflation port is closed, the control gas is evacuated, the spring pushes the piston to return, and the valve sealing port is closed.

10. A method for exhausting the inflation valve of a pressure-stabilizing gas cylinder according to any one of claims 1 to 8, characterized in that The specific steps are as follows: introducing gas into the gas flow cavity in the shell through the exhaust port; The control gas is introduced into the control chamber in the housing through the control port, and the pressure generated by the control gas pushes the piston and the valve core rod to move toward the gas flow chamber to open the valve; The gas in the gas flow chamber enters the balance chamber through the valve sealing port and is then discharged from the inflation port; When exhaust is completed, the exhaust port is closed, the control gas is evacuated, the spring pushes the piston to return, and the valve sealing port is closed.

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