Compensated seal fluid control device

Abstract

The utility model relates to valve technical field especially a kind of compensation sealing mode fluid control device, it includes electromagnetic coil and main valve body. Main valve body is equipped with first port, second port and third port, respectively for connecting external fluid medium equipment, wherein first port is as the input port of access fluid medium, second port, third port as the output port existing in parallel, both are interconnected in main valve body inside by first sliding hole. Main valve core is slidably connected in first sliding hole, initial state, the first port is communicated with the third port, and when main valve core slides to preset position, main valve core fills first sliding hole and disconnects the communication state of first port and third port, blocks fluid medium flow, and switches to the communication state of first port and second port, realizes switch function.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a fluid control device with a compensating sealing method. Background Technology

[0002] Fluid control valves are key devices for regulating the flow of liquids and gases, and their application is increasingly widespread, especially in the fields of fluid flow direction switching and on / off control. As an important type, electrically controlled valves play a central role in modern fluid control systems due to their significant advantages such as simple control, good sealing performance, low energy consumption, and high cost-effectiveness. Their functionality relies on sealing technology; based on whether there is relative movement between the sealing element and the contact element, they can be divided into static seals and dynamic seals. The flow direction switching and on / off actions within the valve must be accomplished through a reliable dynamic seal.

[0003] However, current mainstream dynamic sealing technologies still face challenges. The most commonly used soft rubber seals rely on elastic deformation to achieve sealing, but they suffer from drawbacks such as high friction, poor wear resistance, and susceptibility of rubber properties to temperature changes. Hard seals, on the other hand, suffer from poor sealing performance and are susceptible to the cleanliness of the medium. Neither of these mainstream methods can meet the market's widespread demand for long valve service life. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this application provides a fluid control device with a compensating sealing method, comprising: The main valve body is provided with a first port, a second port and a third port that communicate with each other. The main valve body is provided with a first sliding hole that communicates with the first port, the second port and the third port. The main valve core is slidably disposed in the first sliding hole. The solenoid valve includes: an electromagnetic coil. The second housing has a second sliding hole inside and a fourth port connected to the second sliding hole. The fourth port is connected to the second port and is connected to a high-pressure fluid. The solenoid valve core is slidably disposed in the second sliding hole to open and close the fourth port; In the initial state, the first port is connected to the third port. After the second housing is energized, the solenoid valve core moves away from the fourth port to open the fourth port. The main valve core is pushed to a preset position by the pressure of the high-pressure fluid in the fourth port to disconnect the connection between the first port and the third port and switch to the connection state between the first port and the second port.

[0005] Furthermore, an electromagnetic coil is embedded in the peripheral wall of the second sliding hole, and the electromagnetic valve core is an iron valve core.

[0006] Furthermore, the solenoid valve core includes: The iron core is slidably disposed within the second sliding hole; A sealing gasket is provided at the end of the iron core facing the fourth port to open and close the fourth port; When the electromagnetic coil is energized, the iron core moves away from the fourth port, so that the sealing gasket opens the fourth port.

[0007] Furthermore, the main valve body is also provided with a pilot air inlet that communicates with the fourth port. The pilot air inlet is connected to a high-pressure fluid. The solenoid valve core is closed in the initial state.

[0008] Furthermore, the diameter of the pilot air inlet is smaller than the diameter of the first sliding hole and / or the second sliding hole.

[0009] Furthermore, the sealing gasket has a first structural portion and a second structural portion, the first structural portion being connected to the end of the iron core facing the pilot air inlet, the second structural portion being formed at the end of the first structural portion facing the pilot air inlet, and the size of the first structural portion being larger than the size of the second structural portion.

[0010] Furthermore, the second structural component is a soft colloid.

[0011] Furthermore, the main valve body includes: The first housing has a first sliding hole, a first port and a second port that are interconnected inside. The main valve core is provided with two stepped structures with different shaft diameters. The larger diameter part is used to disconnect the first port and the second port, and the smaller diameter part is used to keep the first port and the second port connected so as to allow the flow of medium fluid.

[0012] Furthermore, the main valve core includes: a main valve stem, a spacer, a first O-ring seal, a T-shaped seal, and a second O-ring seal. The spacer is adapted to be disposed within the first sliding hole. The two end faces of the spacer are annular groove structures. The groove in the middle of the spacer defines and positions the T-ring, the first O-ring seal, and the second O-ring seal. The first O-ring seal is closer to the T-shaped seal than the second O-ring seal. The main valve stem is axial and has two stepped structures with different shaft diameters spaced apart. The main valve stem is slidably disposed within the spacer.

[0013] Furthermore, the width of the inner narrow side of the T-ring is 0.5mm-1.5mm.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: The main valve body has a first port, a second port, and a third port, which are used to connect to external fluid media equipment. The first port serves as the input port for the fluid medium, while the second and third ports are parallel output ports, interconnected within the main valve body via a first sliding hole. The main valve core is slidably connected within the first sliding hole. Initially, the first port and the third port are connected. When the main valve core slides to a preset position, it fills the first sliding hole, disconnecting the connection between the first and third ports, blocking the flow of the fluid medium, and switching to the connection between the first and second ports, thus achieving the switching function. A sealing assembly is provided between the main valve core and the inner wall of the first sliding hole to ensure the sealing of the flow direction switching and switching action. However, this sealing assembly suffers from wear during operation. To address this issue, this application adds a solenoid valve to the main valve body to provide sealing compensation. Specifically, the second housing of the solenoid valve has a second sliding hole and a fourth port connected to it. The fourth port is connected to the second port and connected to an external high-pressure fluid source to drive the main valve core. The solenoid valve core is slidably positioned within the second sliding hole to open and close the fourth port. When the main valve core needs to be moved, the solenoid valve controls the solenoid valve core to slide away from the fourth port to open it. High-pressure fluid enters the second port, pushing the main valve core slowly to a preset position, achieving a blocking effect. Compared to traditional rapid actuation methods, this mechanism utilizes high-pressure fluid to make the main valve core move more gently, avoiding severe wear on the sealing components. During the slow actuation process, the sealing components deform slowly and quickly recover based on their material properties, effectively supplementing the seal. Attached Figure Description

[0015] This application can be better understood by describing its embodiments in conjunction with the accompanying drawings, in which: Figure 1 This diagram shows a cross-sectional structural schematic of an embodiment of a fluid control device with a compensating sealing method according to the present application.

[0016] Figure 2 A cross-sectional structural schematic diagram showing the main valve body in the connected state of an embodiment of a fluid control device with a compensating sealing method according to this application; Figure 3 A cross-sectional structural schematic diagram showing the main valve body in the connected state of an embodiment of a fluid control device with a compensating sealing method according to this application; Figure 4 yes Figure 3 A magnified view of a portion of point N in the middle; Figure 5 This is a cross-sectional structural schematic diagram showing the main valve body in a connected state according to another embodiment of a fluid control device with a compensating sealing method based on this application.

[0017] In the above figures, the meanings of the reference numerals are as follows: 10. Main valve body; 101. First port; 102. Second port; 103. First sliding hole; 104. Pilot air inlet; 105. Third port; 11. Main valve core; 111. Main valve stem; 112. Spacer; 113. First O-ring seal; 114. T-shaped seal; 115. Second O-ring seal; 20. Solenoid valve; 201. Second sliding hole; 202. Fourth port; 21. Second housing; 22. Solenoid valve core; 221. Iron core; 222. Sealing gasket; 2221. First structural part; 2222. Second structural part. Detailed Implementation

[0018] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0019] All the values ​​listed in this article, ranging from the lowest to the highest, refer to all values ​​obtained by incrementing the lowest and highest values ​​by one unit when the difference between the lowest and highest values ​​is more than two units.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] Fluid control valves are key devices for regulating the flow of liquids and gases, and their application is increasingly widespread, especially in the fields of fluid flow direction switching and on / off control. As an important type, electrically controlled valves play a central role in modern fluid control systems due to their significant advantages such as simple control, good sealing performance, low energy consumption, and high cost-effectiveness. Their functionality relies on sealing technology; based on whether there is relative movement between the sealing element and the contact element, they can be divided into static seals and dynamic seals. The flow direction switching and on / off actions within the valve must be accomplished through a reliable dynamic seal.

[0023] However, current mainstream dynamic sealing technologies still face challenges. The most commonly used soft rubber seals rely on elastic deformation to achieve sealing, but they suffer from drawbacks such as high friction, poor wear resistance, and susceptibility of rubber properties to temperature changes. Hard seals, on the other hand, suffer from poor sealing performance and are susceptible to the cleanliness of the medium. Neither of these mainstream methods can meet the market's widespread demand for long valve service life.

[0024] In view of this, such as Figures 1-5 As shown, this application proposes a fluid control device with a compensated sealing method, comprising: The main valve body 10 is provided with a first port 101, a second port 102 and a third port 105 communicating with each other. The main valve body 10 is provided with a first sliding hole 103 communicating with the first port 101, the second port 102 and the third port 105. The main valve core 11 is slidably disposed in the first sliding hole 103. Electromagnetic coil 20, the electromagnetic coil 20 comprising: The second housing 21 has a second sliding hole 201 inside and a fourth port 202 connected to the second sliding hole 201. The fourth port 202 is connected to the second port 102 and is connected to a high-pressure fluid. The solenoid valve core 22 is slidably disposed in the second sliding hole 201 to open and close the fourth port 202; Among them, such as Figure 2 As shown in the figure, the arrows indicate the direction of medium flow. Initially, the first port 101 is connected to the third port 105. After the second housing 21 is energized, the solenoid valve core 22 moves away from the fourth port 202 to open the fourth port 202. The main valve core 11 is pushed to a preset position by the pressure of the high-pressure fluid in the fourth port 202. Figure 5 As shown in the figure, the arrows indicate the direction of medium flow, so as to disconnect the connection between the first port 101 and the third port 105, and switch to the connection state between the first port 101 and the second port 102.

[0025] In this embodiment, the main valve body 10 has a first port 101, a second port 102, and a third port 105. Initially, the first port 101 and the third port 105 are connected, while the first port 101 and the second port 102 are disconnected. The first port 101 serves as the inlet port for the fluid medium, while the second port 102 and the third port 105 serve as the outlet ports for the fluid medium. The first port 101, the second port 102, and the third port 105 are connected to the first sliding hole 103 inside the main valve body 10. When the main valve core 11 slides into the first sliding hole 103, it fills the first sliding hole 103. After the main valve core 11 slides to a preset position, the connection between the first port 101 and the third port 105 is broken, preventing the fluid medium in the first port 101 from connecting to the third port 105 through the first sliding hole 103, thus achieving a blocking effect, and switching back to the connection state between the first port 101 and the second port 102.

[0026] It is worth noting that a sealing assembly is provided between the main valve core 11 and the inner wall of the first sliding hole 103. The flow direction switching and opening / closing action inside the main valve body 10 must be completed through a reliable sealing assembly. Therefore, the sealing assembly is subject to wear during the operation of the main valve body 10. This application provides sealing compensation by providing an electromagnetic coil 20 on the main valve body 10. The second housing 21 of the electromagnetic coil 20 has a second sliding hole 201 and a fourth port 202 communicating with it. The fourth port 202 communicates with the second port 102 and is connected to a high-pressure fluid to drive the movement of the main valve core 11. Specifically, the electromagnetic valve core 22 is slidably disposed in the second sliding hole 201 to open and close the fourth port 202. For example, when it is necessary to drive the main valve core 11 of the main valve body 10 to move, the solenoid coil 20 controls the solenoid valve core 22 to move in a direction away from the fourth port 202, so that the solenoid valve core 22 opens the fourth port 202. The high-pressure fluid in the fourth port 202 enters the second port 102 and generates high pressure, which pushes the main valve core 11 to move. The main valve core 11 is pushed to a preset position, disconnecting the connection between the first port 101 and the second port 102, thus achieving a blocking effect. Compared with the traditional method of directly and quickly pushing the main valve core 11 to move, the movement of the main valve core 11 is more gradual when the solenoid coil 20 and high-pressure fluid drive the main valve core 11. This avoids the severe wear of the sealing components caused by the rapid pushing of the main valve core 11. During the slow pushing of the main valve core 11, the deformation of the sealing components is slow, and according to the material properties of the sealing components themselves, they can quickly recover, thus achieving the effect of sealing replenishment.

[0027] Specifically, a copper coil is embedded in the peripheral wall of the second sliding hole 201, and the solenoid valve core 22 is an iron valve core. In this embodiment, in order to facilitate precise control of the movement of the solenoid valve core 22, an electromagnetic coil (not shown in the figure) can be embedded in the peripheral wall of the second sliding hole 201, and the solenoid valve core 22 is an iron valve core. In this way, the speed of the solenoid valve core 22 can be adjusted by precisely controlling the current, so as to control the slow pushing effect of the main valve core 11.

[0028] Specifically, the solenoid valve core 22 includes: The iron core 221 is slidably disposed within the second sliding hole 201; A sealing gasket 222 is disposed at one end of the iron core 221 facing the fourth port 202 to open and close the fourth port 202; When the electromagnetic coil is energized, the iron core 221 moves away from the fourth port 202, so that the sealing gasket 222 opens the fourth port 202.

[0029] In this embodiment, in order to open and close the fourth port 202, a sealing gasket 222 can be provided at the end of the iron core 221 facing the fourth port 202. In the initial state, the sealing gasket 222 blocks the communication between the fourth port 202 and the second port 102, such as... Figure 1 As shown, when the electromagnetic coil is energized, the electromagnetic valve core 22 moves upward, driving the sealing gasket 222 to move upward, restoring the connection between the fourth port 202 and the second port 102. The high-pressure fluid in the fourth port 202 enters the second port 102, generating high pressure and pushing the main valve core 11 to move. The main valve core 11 is pushed to the preset position, disconnecting the connection between the first port 101 and the second port 102, thus achieving the blocking effect.

[0030] Specifically, the main valve body 10 is also provided with a pilot air inlet 104 that communicates with the fourth port 202. The pilot air inlet 104 is connected to a high-pressure fluid. The solenoid valve core 22 closes the pilot air inlet 104 in the initial state.

[0031] In this embodiment, to facilitate the control of the movement of the main valve core 11, a pilot air inlet 104 communicating with the fourth port 202 can be provided inside the main valve body 10. The pilot air inlet 104 is connected to high-pressure gas. In the initial state, the sealing gasket 222 blocks the pilot air inlet 104, such as... Figure 1As shown, when the electromagnetic coil is energized, the electromagnetic valve core 22 moves upward, causing the sealing gasket 222 to move upward. The pilot air inlet 104 is connected to external high-pressure gas. The high-pressure gas passes through the fourth port 202 and connects with the second port 102. The high-pressure fluid in the fourth port 202 enters the second port 102 and generates high pressure, which pushes the main valve core 11 to move. The main valve core 11 is pushed to the preset position, disconnecting the connection between the first port 101 and the second port 102, thus achieving the blocking effect.

[0032] Specifically, the diameter of the pilot air inlet 104 is smaller than the diameter of the first sliding hole 103 and / or the second sliding hole 201. In this embodiment, in order to facilitate providing sufficient pressure to the main valve core 11, the diameter of the pilot air inlet 104 is set to be smaller than the diameter of the first sliding hole 103 and / or the second sliding hole 201, thereby increasing the output air pressure intensity by using a small-diameter pipe.

[0033] Specifically, the sealing gasket 222 has a first structural portion 2221 and a second structural portion 2222. The first structural portion 2221 is connected to the end of the iron core 221 facing the pilot air inlet 104, and the second structural portion 2222 is formed at the end of the first structural portion 2221 facing the pilot air inlet 104. The size of the first structural portion 2221 is larger than the size of the second structural portion 2222. In this embodiment, the cross-sectional structure of the sealing gasket 222 includes the first structural portion 2221 and the second structural portion 2222, presenting an overall stepped structure. The size of the first structural portion 2221 is larger than the size of the second structural portion 2222. The first structural portion 2221 is fixed to the end of the iron core 221 facing the pilot air inlet 104, and the second structural portion 2222 is used to block the pilot air inlet 104.

[0034] Specifically, the second structural part 2222 is a soft colloid. In this embodiment, in order to ensure the sealing effect of the pilot air inlet 104, the second structural part 2222 is made of a soft colloid.

[0035] Specifically, the first housing has a second sliding hole 201, a first port 101 and a second port 102 that are interconnected inside. The main valve core 11 is provided with two stepped structures with different shaft diameters. The larger diameter part is used to disconnect the communication between the first port 101 and the second port 102, and the smaller diameter part is used to keep the communication between the first port 101 and the second port 102 so as to allow the flow of medium fluid.

[0036] In this embodiment, the stepped main valve core 11 is disposed throughout, such as... Figure 2 and 3As shown, in the initial state, the smaller diameter portion of the main valve core 11 is located between the first port 101 and the second port 102, keeping the first port 101 and the second port 102 in communication for the flow of the medium fluid (such as...). Figure 2 (As shown by the dashed arrow). When the main valve core 11 moves to the preset position, the larger diameter part is located between the first port 101 and the second port 102, keeping the first port 101 and the second port 102 in a blocked state.

[0037] like Figure 4 As shown, specifically, the main valve core 11 includes: a first O-ring seal 113, a T-ring seal 114, and a second O-ring seal 115. The spacer 112 is adapted to be disposed within the first sliding hole 103. The two end faces of the spacer 112, the first O-ring seal 113, and the second O-ring seal 115 form an annular groove structure. The groove in the middle of the spacer 112 defines and positions the T-ring seal 114, the first O-ring seal 113, and the second O-ring seal 115. The first O-ring seal 113 is closer to the T-ring seal 114 than the second O-ring seal 115. Figure 4 As shown, the T-shaped seal 114 and the second O-ring seal 115 may be provided with a partition. In one specific embodiment, the spacer 112 includes two grooves, one groove for restricting the T-shaped seal 114 and the first O-ring seal 113, and the other groove for restricting the second O-ring seal 115. The main valve stem 111 is axial and has two stepped structures with different shaft diameters spaced apart, and the main valve stem 111 is slidably disposed within the spacer 112.

[0038] In this embodiment, the spacer 112 has annular groove structures at both ends. When a pair of spacers 112 are mated, the groove structures on them are assembled to form a complete retaining ring, which is used to limit and position the T-shaped seal 114, the first O-ring seal 113, and the second O-ring seal 115. The main purpose of designing the retaining ring as a two-half structure (i.e. formed by the assembly of two spacers 112) is to facilitate the installation of the seals. The first O-ring seal 113 located on the outside is used to achieve a static seal between the main valve stem 111 and the spacer 112. An elastic first O-ring seal 113 is fitted on the outer diameter of the T-shaped seal 114 to achieve a dynamic seal between the main valve stem 111 and the spacer 112. The flow direction of the medium fluid is switched by the fixed stroke movement of the main valve stem 111.

[0039] The T-seal 114 is made of a low-elasticity polymer material (such as PET, polytetrafluoroethylene, etc.), and is a quasi-rigid seal that ensures low elasticity. The narrow inner side of the T-seal 114 contacts the main valve stem 111, and its inner diameter is close to the diameter of the main valve stem 111. Under the clamping and elastic action of the first O-ring seal 113, the narrow inner side of the T-seal 114 contracts and deforms to achieve a seal. Even if the narrow inner side of the T-seal 114 wears, the elasticity of the first O-ring seal 113 can provide compensation, thereby maintaining the sealing performance against the main valve stem 111. Furthermore, the width of the narrow inner side of the T-seal 114 is approximately 1 mm. This design reduces the contact area between the T-seal 114 and the main valve stem 111, helping to reduce frictional resistance.

[0040] Specifically, the iron core 221 is a lead screw, and the iron core 221 is threadedly connected to the second sliding hole 201. In this embodiment, setting the iron rod as a lead screw and threading it to the second sliding hole 201 helps to adjust the extension and retraction speed of the iron core 221 by precisely controlling the current. Increasing the current makes the iron core 221 move faster and the thrust increases; conversely, decreasing the current makes the iron core 221 move slower and the thrust decreases.

[0041] In this application, the narrow side of the inner side of the T-type seal 114 can shrink and deform for sealing. Even if the inner ring is worn, the elasticity of the first O-ring seal 113 can be obtained to ensure the sealing performance of the main valve stem 111. In fact, it can combine the advantages of both mechanical seal and elastic seal.

[0042] Furthermore, in this application, the second O-ring seal 115 can be used to achieve a static seal between the valve body and the spacer 112, and a first O-ring seal 113 is fitted around the outer periphery of the T-shaped seal 114 to serve as a seal between the valve stem 111 and the spacer 112. The fixed stroke of the valve stem 111 is used to achieve the switching of the flow direction of the medium fluid.

[0043] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fluid control device with a compensating sealing method, characterized in that, include: The main valve body is provided with a first port, a second port and a third port that communicate with each other. The main valve body is provided with a first sliding hole that communicates with the first port, the second port and the third port. The main valve core is slidably disposed in the first sliding hole. Solenoid valve, the solenoid valve comprising: The second housing has a second sliding hole inside and a fourth port connected to the second sliding hole. The fourth port communicates with the first sliding hole and is connected to a high-pressure fluid. The solenoid valve core is slidably disposed in the second sliding hole to open and close the fourth port; In the initial state, the first port is connected to the third port. After the second housing is energized, the solenoid valve core moves away from the fourth port to open the fourth port. The main valve core is pushed to a preset position by the pressure of the high-pressure fluid in the fourth port to disconnect the connection between the first port and the third port and switch to the connection state between the first port and the second port.

2. The fluid control device with a compensating sealing method according to claim 1, characterized in that, An electromagnetic coil is embedded in the peripheral wall of the second sliding hole, and the electromagnetic valve core is an iron valve core.

3. The fluid control device with a compensating sealing method according to claim 2, characterized in that, The solenoid valve core includes: The iron core is slidably disposed within the second sliding hole; A sealing gasket is provided at the end of the iron core facing the fourth port to open and close the fourth port; When the electromagnetic coil is energized, the iron core moves away from the fourth port, so that the sealing gasket opens the fourth port.

4. The fluid control device with a compensating sealing method according to claim 3, characterized in that, The main valve body is also provided with a pilot air inlet that communicates with the fourth port. The pilot air inlet is connected to a high-pressure fluid. The solenoid valve core is closed in the initial state.

5. The fluid control device with a compensating sealing method according to claim 4, characterized in that, The diameter of the pilot air inlet is smaller than the diameter of the first sliding hole and / or the second sliding hole.

6. The fluid control device with a compensating sealing method according to claim 4, characterized in that, The sealing gasket has a first structural portion and a second structural portion. The first structural portion is connected to the end of the iron core facing the pilot air inlet, and the second structural portion is formed at the end of the first structural portion facing the pilot air inlet. The size of the first structural portion is larger than the size of the second structural portion.

7. The fluid control device with a compensating sealing method according to claim 6, characterized in that, The second structural component is a soft colloid.

8. The fluid control device with a compensating sealing method according to claim 1, characterized in that, The main valve body includes: The first housing has a first sliding hole, a first port and a second port that are interconnected inside. The main valve core is provided with two stepped structures with different shaft diameters. The larger diameter part is used to disconnect the first port and the second port, and the smaller diameter part is used to keep the first port and the second port connected so as to allow the flow of medium fluid.

9. The fluid control device with a compensating sealing method according to claim 6, characterized in that, The main valve core includes: a main valve stem, a spacer, a first O-ring seal, a T-ring seal, and a second O-ring seal. The spacer is adapted to be disposed in the first sliding hole. The two end faces of the spacer are annular groove structures. The groove in the middle of the spacer defines and positions the T-ring, the first O-ring seal, and the second O-ring seal. The first O-ring seal is closer to the T-ring seal than the second O-ring seal. The main valve stem is axial and has two stepped structures with different shaft diameters spaced apart. The main valve stem is slidably disposed within the spacer.

10. The fluid control device with a compensating sealing method according to claim 9, characterized in that, The inner narrow side width of the T-ring is 0.5mm-1.5mm.

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