Fluid control device for a fluid metering control valve

Abstract

The application belongs to the technical field of valves, and particularly discloses a fluid control device of a fluid ration control valve, which comprises a valve body, discharge channels and inlet channels symmetrically arranged on two sides of the valve body, and a connecting channel arranged between the inlet channels and the discharge channels for connection; an electromagnetic control device installed on the top of the valve body; a sealing device installed in the connecting channel and used for realizing the opening or closing operation of the valve body under the control of the electromagnetic control device, wherein the sealing device comprises an installation plate, a sealing plug, an adjusting assembly and a lifting assembly. The application can change the matching gap between the sealing plug and the connecting channel through the adjusting assembly, accurately control the fluid flow area, solve the problem that the traditional electromagnetic valve can only be switched and cannot regulate the flow, ensure the synchronous operation of multiple oil / gas cylinders and other execution units, and avoid tilting and asynchronization.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and particularly relates to a fluid control device for a fluid metering control valve. Background Technology

[0002] Fluid control valves are core control components in industrial automation and fluid transport systems, also known as regulating valves or automatic control valves. They receive signals from the controller and precisely regulate, switch, or protect parameters such as flow rate, pressure, direction, and level of fluids (liquids, gases, steam, etc.) by changing the area or opening / closing of their internal flow channels.

[0003] Existing fluid control valves are mainly divided into electrically controlled valves and manually controlled valves. Electrically controlled valves primarily use electromagnets to control the opening and closing of the valve body. However, electromagnetically controlled valves can only control the on / off state and cannot adjust the flow rate. Therefore, when multiple actuators operate synchronously (e.g., multiple hydraulic / pneumatic cylinders need to rise and fall simultaneously; if the flow rates are inconsistent, tilting and asynchrony will occur, requiring adjustment of individual flow rates to ensure consistent speed), the valve cannot adjust the flow rate as needed. This is inconvenient and cannot guarantee the synchronous operation of multiple actuators.

[0004] Therefore, it is necessary to invent a fluid control device for a fluid metering control valve to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, the present invention provides a fluid control device for a fluid metering control valve, thereby solving one of the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fluid control device for a fluid metering control valve, comprising: The valve body has a discharge channel and an inlet channel symmetrically opened on both sides, and a connecting channel for communication is opened between the inlet channel and the discharge channel; An electromagnetic control device is installed on the top of the valve body; A sealing device, installed within the connecting channel, is used to open or close the valve body under the control of an electromagnetic control device. The sealing device includes a mounting plate, a sealing plug, an adjusting assembly, and a lifting assembly. The mounting plate is horizontally positioned at the top of the connecting channel. The sealing plug is detachably installed at the bottom of the mounting plate. The lifting assembly connects the mounting plate and the electromagnetic control device, and is used to move the sealing plug vertically. The adjusting assembly is installed on the sealing plug and is used to adjust the opening and closing range of the sealing plug relative to the connecting channel.

[0007] Furthermore, the end of the inlet channel near the connecting channel is located at the bottom of the outlet channel, the inner diameter of the connecting channel gradually decreases from top to bottom, and the size of the sealing plug matches the size of the connecting channel.

[0008] Furthermore, the electromagnetic control device includes a protective cover, an electromagnet, a connecting rod, a magnetic block, and a return spring. The protective cover is detachably installed on the top of the valve body, and a circular fixing plate is detachably installed at the bottom opening of the protective cover. The electromagnet is detachably installed on the inner wall of the top of the protective cover. The connecting rod is vertically slidably inserted through the axis of the fixing plate. The magnetic block is fixedly connected to the top of the connecting rod, and when the electromagnet is energized, the magnetic poles of the magnetic block and the electromagnet are opposite. The return spring is sleeved on the outer periphery of the top of the connecting rod, and the top of the return spring is fixedly connected to the electromagnet. A pressure plate is fixedly connected to the bottom of the return spring, and the pressure plate is fixedly sleeved on the connecting rod, with the pressure plate located on top of the fixing plate.

[0009] Furthermore, the adjustment assembly includes an adjustment tube, an adjustment rod, a positioning ring, and a seal. The adjustment tube is vertically and movably inserted into the axis of the mounting plate and the sealing plug in sequence, and an annular limiting protrusion is provided at the bottom edge of the adjustment tube. The adjustment rod is rotatably inserted into the bottom of the adjustment tube, and the bottom end of the adjustment rod is rotatably inserted into the bottom of the valve body. The positioning ring is slidably installed inside the adjustment tube in the vertical direction, and the positioning ring is threaded onto the adjustment rod. The seal is sleeved on the adjustment tube near the top end to seal the gap between the sleeve and the sealing plug.

[0010] Furthermore, the sealing element includes an installation ring, a limiting rod, a pressure ring, and a sealing ring. The installation ring is fixedly sleeved on the adjusting tube near the top end. There are multiple limiting rods, which are evenly and vertically fixedly connected to the top of the installation ring. The top end of each limiting rod is vertically slidably inserted into the inner wall of the top of the valve body. The pressure ring is fixedly connected to the bottom of the installation ring and is coaxial with the installation ring. The sealing ring is fixedly connected to the bottom of the pressure ring, and the size of the sealing ring matches the size of the bottom of the pressure ring. An annular sealing groove matching the size of the sealing ring is provided on the top of the mounting plate at the position directly opposite the sealing ring.

[0011] Furthermore, the lifting assembly includes a valve stem, a plug rod, and a tension spring. The valve stem is located at the top axis of the adjusting tube and is vertically slidably inserted into the top of the valve body. The top end of the valve stem is detachably connected to the bottom end of the connecting rod. The plug rod is slidably inserted into the bottom axis of the valve stem and is fixedly connected to the top of the adjusting tube. The tension spring is fixedly connected between the top end of the plug rod and the inside of the valve stem. In the initial state, the adjusting tube can fit against the bottom end of the valve stem under the tension of the tension spring on the plug rod.

[0012] Furthermore, a damping spring is fixedly connected to the bottom of the mounting ring. The damping spring is sleeved on the outside of the adjusting tube. The bottom end of the damping spring can always contact the top of the mounting plate. In the initial state, the sealing plug can contact the limiting protrusion under the pushing force of the damping spring on the mounting plate, and at this time the sealing ring can be completely separated from the annular sealing groove.

[0013] Furthermore, the mounting plate has several strip-shaped protrusions evenly distributed in a ring on its side, and the strip-shaped protrusions are inclined. Several levers are provided around the periphery of the mounting plate. The levers are fixedly connected to the inner wall of the valve body. The free end of the lever can contact the strip-shaped protrusions on the side of the mounting plate, and when the sealing plug is removed from the connecting channel, the lever can be completely separated from the side of the mounting plate.

[0014] The technical effects and advantages of this invention are as follows: 1. Precise flow regulation to adapt to the synchronous operation of multiple actuators: This invention can change the fit gap between the sealing plug and the connecting channel by adjusting the component, so as to precisely control the fluid flow area, solve the problem that traditional solenoid valves can only open and close but cannot adjust the flow, and ensure that multiple hydraulic cylinders / pneumatic cylinders and other actuators operate synchronously, avoiding tilting and asynchrony; 2. This invention incorporates a damping spring, which absorbs fluid impact and water hammer effect, reducing the instantaneous impact force on the sealing plug and valve body. The sealing plug can adaptively float, reducing wear caused by high-speed fluid scouring and improving durability.

[0015] 3. When the valve body is closed, the present invention can cause the sealing plug to rotate slightly by means of the cooperation between the strip protrusion on the side of the mounting plate and the lever, so that the valve body can fit more evenly against the inner wall of the channel, thereby further improving the sealing reliability.

[0016] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial perspective sectional view of the present invention; Figure 3 This is a perspective sectional view of the valve body and sealing device in this invention; Figure 4 In this invention Figure 3 Enlarged view of part A; Figure 5 This is a three-dimensional sectional view of the valve body in this invention; Figure 6 This is a three-dimensional schematic diagram of the mounting plate, sealing plug, and strip-shaped protrusion of the present invention.

[0019] In the diagram: 1. Valve body; 2. Discharge channel; 3. Inlet channel; 4. Connection channel; 5. Mounting plate; 6. Sealing plug; 7. Protective cover; 8. Electromagnet; 9. Connecting rod; 10. Magnetic block; 11. Return spring; 12. Fixing plate; 13. Pressure plate; 14. Adjusting pipe; 15. Adjusting rod; 16. Positioning ring; 17. Limiting protrusion; 18. Mounting ring; 19. Limiting rod; 20. Pressure ring; 21. Sealing ring; 22. Valve stem; 23. Insert rod; 24. Tension spring; 25. Vibration damping spring; 26. Strip protrusion; 27. Toggle lever. Detailed Implementation

[0020] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This invention provides, for example Figures 1 to 6 The fluid control device of a fluid metering control valve shown includes: a valve body 1, an electromagnetic control device, and a sealing device. The valve body 1 has a discharge channel 2 and an inlet channel 3 symmetrically opened on both sides, and a connecting channel 4 for communication between the inlet channel 3 and the discharge channel 2. The electromagnetic control device is installed on the top of the valve body 1. The sealing device is installed in the connecting channel 4 and is used to realize the opening or closing operation of the valve body 1 under the control of the electromagnetic control device. The sealing device includes a mounting plate 5, a sealing plug 6, an adjusting component, and a lifting component. The mounting plate 5 is horizontally set on the top of the connecting channel 4. The sealing plug 6 is detachably installed on the bottom of the mounting plate 5. The lifting component is connected between the mounting plate 5 and the electromagnetic control device and is used to drive the sealing plug 6 to move in the vertical direction. The adjusting component is installed on the sealing plug 6 and is used to adjust the opening and closing range of the sealing plug 6 to the connecting channel 4. The end of the inlet channel 3 near the connecting channel 4 is located at the bottom of the discharge channel 2. The inner diameter of the connecting channel 4 gradually decreases from top to bottom, and the size of the sealing plug 6 matches the size of the connecting channel 4. The electromagnetic control device includes a protective cover 7, an electromagnet 8, a connecting rod 9, a magnetic block 10, and a return spring 11. The protective cover 7 is detachably installed on the top of the valve body 1, and a circular fixing plate 12 is detachably installed at the bottom opening of the protective cover 7. The electromagnet 8 is detachably installed on the inner wall of the top of the protective cover 7. The connecting rod 9 is vertically slidably inserted through the axis of the fixing plate 12. The magnetic block 10 is fixedly connected to the top of the connecting rod 9, and when the electromagnet 8 is energized, the magnetic poles of the magnetic block 10 and the side opposite to that of the electromagnet 8 are opposite. The return spring 11 is sleeved on the outer periphery of the top of the connecting rod 9, and the top of the return spring 11 is fixedly connected to the electromagnet 8. The bottom of the return spring 11 is fixedly connected to a pressure plate 13, which is fixedly sleeved on the connecting rod 9 and is located on the top of the fixing plate 12. When in use, when the electromagnet 8 is energized, it generates an attractive force, which pulls the connecting rod 9 and the lifting assembly upward through the attraction of the magnetic force. As the connecting rod 9 is pulled upward, the pressure plate 13 can press the return spring 11 upward, and the sealing plug 6 can be moved out of the connecting channel 4 under the pull of the lifting assembly, thereby realizing the opening operation of the valve body 1. When the electromagnet 8 is de-energized, the attraction of the electromagnet 8 to the magnetic block 10 disappears. At this time, the return spring 11 can push the pressure plate 13 downward, thereby driving the connecting rod 9 and the lifting assembly to move downward. Then, through the pressure of the lifting assembly on the sealing plug 6, the sealing plug 6 is reinserted into the connecting channel 4, thereby realizing the closing operation of the valve body 1.

[0021] like Figures 2 to 4 As shown, the adjustment assembly includes an adjustment tube 14, an adjustment rod 15, a positioning ring 16, and a seal. The adjustment tube 14 is vertically and movably inserted into the axis of the mounting plate 5 and the sealing plug 6 in sequence, and an annular limiting protrusion 17 is provided at the bottom edge of the adjustment tube 14. The adjustment rod 15 is rotatably inserted into the bottom of the adjustment tube 14, and the bottom end of the adjustment rod 15 is rotatably inserted into the bottom of the valve body 1. The positioning ring 16 is slidably installed inside the adjustment tube 14 in the vertical direction, and the positioning ring 16 is threaded onto the adjustment rod 15. The seal is sleeved on the adjustment tube 14 near the top end, and is used to seal the gap between the sleeve and the sealing plug 6. The sealing components include an installation ring 18, a limiting rod 19, a pressure ring 20, and a sealing ring 21. The installation ring 18 is fixedly sleeved on the regulating pipe 14 near the top. There are multiple limiting rods 19, which are evenly and vertically fixedly connected to the top of the installation ring 18. The top of the limiting rod 19 is vertically slidably inserted into the inner wall of the top of the valve body 1. The pressure ring 20 is fixedly connected to the bottom of the installation ring 18 and is coaxial with the installation ring 18. The sealing ring 21 is fixedly connected to the bottom of the pressure ring 20 and the size of the sealing ring 21 matches the size of the bottom of the pressure ring 20. An annular sealing groove matching the size of the sealing ring 21 is opened at the position on the top of the mounting plate 5 opposite to the sealing ring 21. The lifting assembly includes a valve stem 22, a plug rod 23, and a tension spring 24. The valve stem 22 is located at the top axis of the regulating tube 14. The valve stem 22 is vertically slidably inserted into the top of the valve body 1, and the top of the valve stem 22 is detachably connected to the bottom of the connecting rod 9. The plug rod 23 is slidably inserted into the bottom axis of the valve stem 22, and the bottom of the plug rod 23 is fixedly connected to the top of the regulating tube 14. The tension spring 24 is fixedly connected between the top of the plug rod 23 and the inside of the valve stem 22. In the initial state, the regulating tube 14 can be pressed against the bottom of the valve stem 22 under the pulling force of the tension spring 24 on the plug rod 23. With the adjustment component, when the electromagnet 8 drives the valve stem 22 to move upward by attracting the magnetic block 10, the tension spring 24 inside the valve stem 22 can drive the adjustment tube 14 to move downward by pulling the insertion rod 23. As the adjustment tube 14 moves upward, the limiting protrusion 17 at the bottom of the adjustment tube 14 can lift the sealing plug 6 upward, so that the sealing plug 6 can be moved out from the connecting channel 4, thereby realizing the opening operation of the valve body 1. When the flow rate of valve body 1 needs to be adjusted, the adjusting rod 15 can be turned so that the positioning ring 16 can move downward along the inside of the adjusting tube 14 under the action of the adjusting rod 15. When the positioning ring 16 contacts the inner wall of the bottom of the adjusting tube 14, as the adjusting rod 15 is turned further, the positioning ring 16 can press the adjusting tube 14 downward under the action of the adjusting rod 15. As the adjusting tube 14 moves downward, the mounting ring 18 can press the mounting plate 5 downward through the pressure ring 20 under the drive of the adjusting tube 14, thereby driving the sealing plug 6 to move downward. During this process, the insertion rod 23 can stretch and tighten the tension spring 24 under the pull of the adjusting tube 14. As the sealing plug 6 moves downward, the gap between the sealing plug 6 and the connecting channel 4 is changed. Thus, by changing the fit gap between the sealing plug 6 and the connecting channel 4, the fluid flow rate can be precisely adjusted to meet the flow matching requirements when multiple actuators operate synchronously. When the electromagnet 8 is de-energized, as the return spring 11 presses down on the pressure plate 13, the connecting rod 9 can drive the valve stem 22 to move downward under the action of the pressure plate 13. When the valve stem 22 contacts the top of the regulating pipe 14, the valve stem 22 can press down on the regulating pipe 14 to drive the mounting ring 18 to move downward. As the mounting ring 18 moves downward, the sealing plug 6 can finally be inserted into the connecting channel 4 under the pushing force of the damping spring 25. At this time, as the valve stem 22 continues to move downward, the mounting ring 18 can continue to move downward and compress the damping spring 25. The pressure ring 20 can press the sealing ring 21 into the annular sealing groove at the top of the mounting plate 5 under the action of the mounting ring 18. Thus, while pressing the sealing plug 6 into the connecting channel 4, the sealing ring 21, the pressure ring 20, and the mounting ring 18 can cooperate with each other to seal the gap between the sealing plug 6 and the regulating pipe 14, thereby ensuring the sealing performance of the valve body 1 when closed.

[0022] like Figure 3 and Figure 4 As shown, a damping spring 25 is fixedly connected to the bottom of the mounting ring 18. The damping spring 25 is sleeved on the outside of the adjusting tube 14. The bottom end of the damping spring 25 can always contact the top of the mounting plate 5. In the initial state, the sealing plug 6 can contact the limiting protrusion 17 under the pushing force of the damping spring 25 on the mounting plate 5, and at this time the sealing ring 21 can be completely separated from the annular sealing groove. By providing a damping spring 25, during the use of the valve body 1, when fluids of different flow rates impact the sealing plug 6, the sealing plug 6 can move up and down along the regulating pipe 14 under the impact of the fluid. During this process, the damping spring 25 can adaptively extend or shorten. As the damping spring 25 extends and shortens, the impact force of the fluid on the sealing plug 6 can be partially converted into the elastic potential energy of the damping spring 25, thereby reducing the impact of the fluid on the sealing plug 6 and extending the service life of the sealing plug 6. In addition, when the valve body 1 is suddenly closed, the fluid will generate a water hammer effect due to the sudden interruption of flow, which will cause an instantaneous impact on the valve body 1 and its internal sealing plug 6 and other structures. At this time, the damping spring 25 is provided, which can absorb the impact force and reduce the impact force on the valve body 1 and its internal structure.

[0023] like Figure 5 and Figure 6 As shown, the side of the mounting plate 5 is evenly distributed with several strip-shaped protrusions 26, which are inclined. Several levers 27 are provided around the periphery of the mounting plate 5. The levers 27 are fixedly connected to the inner wall of the valve body 1. The free end of the lever 27 can contact the strip-shaped protrusions 26 on the side of the mounting plate 5. When the sealing plug 6 is removed from the connecting channel 4, the lever 27 can be completely separated from the side of the mounting plate 5. With the strip-shaped protrusion 26 and lever 27 provided, when the mounting plate 5 is pushed by the valve stem 22 to close the connecting channel 4 with the sealing plug 6, as the strip-shaped protrusion 26 on the side of the mounting plate 5 contacts the lever 27, the lever 27 can drive the sealing plug 6 to rotate slightly around the regulating tube 14 by squeezing the strip-shaped protrusion 26, so that the sealing plug 6 can fit more evenly with the inner wall of the connecting channel 4 and improve the sealing effect.

[0024] Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0025] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure 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, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0027] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0028] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A fluid control device for a fluid metering control valve, characterized in that, include: The valve body (1) has a discharge channel (2) and an inlet channel (3) symmetrically opened on both sides, and a connecting channel (4) for communication is opened between the inlet channel (3) and the discharge channel (2). An electromagnetic control device is installed on the top of the valve body (1); A sealing device is installed in the connecting channel (4) and is used to realize the opening or closing operation of the valve body (1) under the control of the electromagnetic control device. The sealing device includes a mounting plate (5), a sealing plug (6), an adjustment component and a lifting component. The mounting plate (5) is horizontally set at the top of the connecting channel (4). The sealing plug (6) is detachably installed at the bottom of the mounting plate (5). The lifting component is connected between the mounting plate (5) and the electromagnetic control device and is used to drive the sealing plug (6) to move in the vertical direction. The adjustment component is installed on the sealing plug (6) and is used to adjust the opening and closing range of the sealing plug (6) relative to the connecting channel (4).

2. The fluid control device for the fluid metering control valve according to claim 1, characterized in that: The end of the inlet channel (3) near the connecting channel (4) is located at the bottom of the outlet channel (2). The inner diameter of the connecting channel (4) gradually decreases from top to bottom, and the size of the sealing plug (6) matches the size of the connecting channel (4).

3. The fluid control device for the fluid metering control valve according to claim 2, characterized in that: The electromagnetic control device includes a protective cover (7), an electromagnet (8), a connecting rod (9), a magnetic block (10), and a return spring (11). The protective cover (7) is detachably installed on the top of the valve body (1), and a circular fixing plate (12) is detachably installed at the bottom opening of the protective cover (7). The electromagnet (8) is detachably installed on the inner wall of the top of the protective cover (7). The connecting rod (9) slides vertically through and is inserted into the axis of the fixing plate (12). The magnetic block (10) is... 0) Fixedly connected to the top of the connecting rod (9), and when the electromagnet (8) is energized, the magnetic block (10) and the magnetic pole on the opposite side of the electromagnet (8) are opposite. The reset spring (11) is sleeved on the outer periphery of the top of the connecting rod (9). The top of the reset spring (11) is fixedly connected to the electromagnet (8). The bottom end of the reset spring (11) is fixedly connected to a pressure plate (13). The pressure plate (13) is fixedly sleeved on the connecting rod (9), and the pressure plate (13) is located on the top of the fixing plate (12).

4. The fluid control device for the fluid metering control valve according to claim 3, characterized in that: The adjustment assembly includes an adjustment tube (14), an adjustment rod (15), a positioning ring (16), and a seal. The adjustment tube (14) is vertically and movably inserted into the axis of the mounting plate (5) and the sealing plug (6) in sequence, and an annular limiting protrusion (17) is provided at the bottom edge of the adjustment tube (14). The adjustment rod (15) is rotatably inserted into the bottom of the adjustment tube (14), and the bottom end of the adjustment rod (15) is rotatably inserted into the bottom of the valve body (1). The positioning ring (16) is slidably installed inside the adjustment tube (14) in the vertical direction, and the positioning ring (16) is threaded onto the adjustment rod (15). The seal is sleeved on the adjustment tube (14) near the top end and is used to seal the gap between the sleeve and the sealing plug (6).

5. The fluid control device for the fluid metering control valve according to claim 4, characterized in that: The sealing components include an installation ring (18), a limiting rod (19), a pressure ring (20), and a sealing ring (21). The installation ring (18) is fixedly sleeved on the regulating tube (14) near the top. There are multiple limiting rods (19), which are uniformly and vertically fixedly connected to the top of the installation ring (18). The top of the limiting rod (19) is vertically slidably inserted into the inner wall of the top of the valve body (1). The pressure ring (20) is fixedly connected to the bottom of the installation ring (18), and the pressure ring (20) is coaxial with the installation ring (18). The sealing ring (21) is fixedly connected to the bottom of the pressure ring (20), and the size of the sealing ring (21) matches the size of the bottom of the pressure ring (20). The top of the mounting plate (5) is provided with an annular sealing groove that matches the size of the sealing ring (21) at the position directly opposite to the sealing ring (21).

6. The fluid control device for the fluid metering control valve according to claim 5, characterized in that: The lifting assembly includes a valve stem (22), a plug rod (23), and a tension spring (24). The valve stem (22) is located at the top axis of the regulating tube (14). The valve stem (22) is vertically slidably inserted into the top of the valve body (1), and the top of the valve stem (22) is detachably connected to the bottom of the connecting rod (9). The plug rod (23) is slidably inserted into the bottom axis of the valve stem (22), and the bottom of the plug rod (23) is fixedly connected to the top of the regulating tube (14). The tension spring (24) is fixedly connected between the top of the plug rod (23) and the inside of the valve stem (22). In the initial state, the regulating tube (14) can fit against the bottom of the valve stem (22) under the pulling force of the tension spring (24) on the plug rod (23).

7. The fluid control device for the fluid metering control valve according to claim 6, characterized in that: The bottom of the mounting ring (18) is fixedly connected to a damping spring (25). The damping spring (25) is sleeved on the outside of the adjusting tube (14). The bottom end of the damping spring (25) can always contact the top of the mounting plate (5). In the initial state, the sealing plug (6) can contact the limiting protrusion (17) under the pushing force of the damping spring (25) on the mounting plate (5), and at this time the sealing ring (21) can be completely separated from the annular sealing groove.

8. The fluid control device for the fluid metering control valve according to claim 7, characterized in that: The mounting plate (5) has several strip-shaped protrusions (26) evenly distributed in a ring on its side. The strip-shaped protrusions (26) are inclined. The mounting plate (5) has several levers (27) around its periphery. The levers (27) are fixedly connected to the inner wall of the valve body (1). The free end of the lever (27) can contact the strip-shaped protrusions (26) on the side of the mounting plate (5). When the sealing plug (6) is removed from the connecting channel (4), the lever (27) can be completely separated from the side of the mounting plate (5).

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