A torsion-resistant flat valve with a multi-point support structure

Abstract

This invention relates to the field of flat plate valve technology and discloses an anti-torsion flat plate valve with a multi-point support structure, including a valve body, a valve cover, and a drive bracket. The valve cover is detachably connected to an opening at the upper end of the valve body. The drive bracket is disposed on the valve cover, and a support structure is provided between the drive bracket and the valve cover. The support structure is configured to suppress the torsional tendency of the drive bracket relative to the valve cover when the drive device opens or closes the valve. The anti-torsion flat plate valve with a multi-point support structure of this invention, by providing a support structure between the valve cover and the drive bracket, can suppress the torsional tendency of the drive bracket relative to the valve cover when the drive device opens or closes the valve, reduce vibration, and prevent the bolts connecting the valve cover and the drive bracket from being sheared or loosened.

Description

Technical Field

[0001] This invention relates to the field of flat plate valve technology, and more specifically, to an anti-torsion flat plate valve with a multi-point support structure. Background Technology

[0002] In industrial fields such as petrochemicals, long-distance pipelines, and water conservancy projects, slab valves are widely used as key fluid control equipment for the opening and closing control of various pipelines. Traditional slab valves typically consist of a valve body, valve plate, valve stem, drive unit (such as an electric, hydraulic, or pneumatic actuator), and a support assembly connecting the drive unit and the valve body.

[0003] In existing technologies, the drive unit is typically connected to the upper end of the support assembly via bolts, and the support assembly is then connected to the upper flange of the valve body via ring-shaped screws. This single-layer connection structure has significant drawbacks under actual high-pressure conditions: when the valve is subjected to high-pressure fluid impact or frequent opening and closing, the torque output by the drive unit is transmitted to the valve body through the support assembly, resulting in significant torsional stress concentration at the connection interface. Specifically: Insufficient torsional resistance: The bracket assembly and valve body are only connected by flange screws, resulting in a limited contact area. Under continuous torsional loads, slight relative rotation is easily generated, which leads to screw loosening and connection failure after long-term operation.

[0004] Uneven stress distribution: The torque transmission path is singular, and the stress is concentrated at the screw connection, which can easily lead to local plastic deformation or fatigue cracks.

[0005] Vibration amplification effect: Under pulsating flow or rapid opening and closing conditions, the single-layer connection structure lacks damping and easily amplifies vibration, affecting the valve's sealing performance and service life.

[0006] Maintenance difficulties: Once the connection becomes loose, the entire drive unit and bracket assembly need to be disassembled for repair, resulting in long downtime.

[0007] Therefore, it is necessary to propose an anti-torsion flat plate valve with a multi-point support structure to solve the problems existing in the prior art. Summary of the Invention

[0008] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0009] To address the aforementioned problems, the present invention provides an anti-torsion flat valve with a multi-point support structure, comprising a valve body, a valve cover, and a drive bracket. The valve cover is detachably connected to an opening at the upper end of the valve body, the drive bracket is disposed on the valve cover, and a support structure is provided between the drive bracket and the valve cover. The support structure is configured to suppress the torsional tendency of the drive bracket relative to the valve cover when the drive device opens or closes the valve.

[0010] Preferably, the support structure includes a limiting plate disposed on the valve cover and a positioning plate disposed at the lower part of the drive bracket. The valve cover includes a first flange and a sleeve. The two limiting plates are disposed opposite to each other on the outer circumferential surface of the sleeve, and the positioning plate is located between the two oppositely disposed limiting plates.

[0011] Preferably, two limiting plates are arranged opposite each other to form a group, and multiple groups of limiting plates are arranged in a circumferential array on the outer circumferential surface of the sleeve; Multiple positioning plates are arranged in a circumferential array at the bottom of the drive bracket, and the number of positioning plates is the same as the number of sets of limiting plates.

[0012] Preferably, clamping components are symmetrically arranged on opposite sides of each set of limiting plates. The clamping components clamp the positioning plates from both sides. When the drive bracket tends to rotate, the clamping components provide a reverse torque to prevent the drive bracket from rotating.

[0013] Preferably, the clamping assembly includes a top block and a first spring. Each set of limiting plates has a sliding groove on its opposite side. The top block is slidably disposed in the sliding groove. The first spring is disposed at the end of the top block that enters the sliding groove, and the end of the first spring away from the top block is connected to the bottom surface of the sliding groove.

[0014] Preferably, a first hydraulic chamber and a second hydraulic chamber are spaced apart inside the valve cover. One of the limiting plates in each set of limiting plates is connected to the first hydraulic chamber, and the other limiting plate is connected to the second hydraulic chamber. Both the first hydraulic chamber and the second hydraulic chamber are filled with hydraulic oil.

[0015] Preferably, the first hydraulic chamber is connected to an oil injection hole on the upper end face of the first flange, and a one-way hydraulic valve is provided on the oil injection hole.

[0016] Preferably, a slot is provided on the side wall of the positioning plate near the center of the drive bracket, and a groove is provided on the side wall of the sleeve between each set of limiting plates. A locking block is slidably arranged in the groove. One end of the locking block extending into the groove is connected to a second spring, and the end of the second spring away from the locking block is connected to the bottom surface of the groove. The locking block engages with the slot.

[0017] Preferably, the end of the card block extending outside the groove is provided with a wedge-shaped engaging part, which engages in the card slot, and the upper end surface of the engaging part is a slope.

[0018] Preferably, the two sides of the positioning plate are symmetrically arranged inclined surfaces, with the sides inclined towards the center of the positioning plate from bottom to top, and the end face of the top block opposite the positioning plate is an inclined surface, with the inclination angle of the side surface and the end face being the same.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects: The anti-torsion flat valve with a multi-point support structure of the present invention has a support structure between the valve cover and the drive bracket. When the drive device opens or closes the valve, it can suppress the torsional tendency of the drive bracket relative to the valve cover, reduce vibration, and prevent the bolts connecting the valve cover and the drive bracket from being sheared or loosened.

[0020] The anti-torsion flat valve with a multi-point support structure described in this invention, other advantages, objectives and features of the invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the anti-torsion flat valve with a multi-point support structure disclosed in this invention. Figure 2 This is a schematic diagram of the connection between the drive bracket and the valve cover disclosed in this invention; Figure 3 This is a schematic diagram of the valve cover structure disclosed in this invention; Figure 4 This is a cross-sectional structural schematic diagram of the valve cover disclosed in this invention; Figure 5 This is a schematic diagram of the structure of the drive bracket and positioning plate disclosed in this invention; Figure 6 This is a schematic diagram of the clamping assembly disclosed in this invention; Figure 7 This is a schematic diagram of the structure of the locking block and the second spring disclosed in this invention mounted on the valve cover; Figure 8 This is a schematic diagram of the structure of the card block and the second spring disclosed in this invention; Figure 9 This is a schematic diagram of the positioning plate disclosed in this invention; Figure 10 This is a schematic diagram of the top block structure disclosed in this invention.

[0022] The components are: 1. Valve body, 2. Valve cover, 3. Drive bracket, 4. Limiting plate, 5. Positioning plate, 6. First flange, 7. Sleeve, 8. Top block, 9. First spring, 10. Slide groove, 11. First hydraulic chamber, 12. Oil injection hole, 13. Slot, 14. Groove, 15. Block, 16. Second spring, 17. Snap-fit ​​part, 18. Upper end face, 19. Side, 20. End face, 100. Screw. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0024] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0025] like Figures 1-10 As shown, the present invention provides an anti-torsion flat plate valve with a multi-point support structure, including a valve body 1, a valve cover 2 and a drive bracket 3. The valve cover 2 is detachably connected to the opening at the upper end of the valve body 1. The drive bracket 3 is disposed on the valve cover 2. A support structure is provided between the drive bracket 3 and the valve cover 2. The support structure is configured to suppress the torsional tendency of the drive bracket 3 relative to the valve cover 2 when the drive device opens or closes the valve.

[0026] Furthermore, the support structure includes a limiting plate 4 disposed on the valve cover 2 and a positioning plate 5 disposed at the lower part of the drive bracket 3. The valve cover includes a first flange 6 and a sleeve 7. The two limiting plates 4 are disposed opposite to each other on the outer circumferential surface of the sleeve 7, and the positioning plate 5 is located between the two oppositely disposed limiting plates 4.

[0027] Furthermore, two limiting plates 4 are arranged opposite each other to form a group, and multiple groups of limiting plates 4 are arranged in a circumferential array on the outer circumferential surface of the sleeve 7; Multiple positioning plates 5 are arranged in a circumferential array at the lower part of the drive bracket 3, and the number of positioning plates 5 is the same as the number of sets of limiting plates 4.

[0028] Furthermore, clamping components are symmetrically arranged on opposite sides of each set of limiting plates 4. The clamping components clamp the positioning plates 5 from both sides. When the drive bracket 3 has a tendency to rotate, the clamping components provide a reverse torque to prevent the drive bracket 3 from rotating.

[0029] Furthermore, the clamping assembly includes a top block 8 and a first spring 9. Each set of limiting plates 4 has a sliding groove 10 on its opposite side. The top block 8 is slidably disposed in the sliding groove 10. The first spring 9 is disposed at the end of the top block 8 that enters the sliding groove 10. The end of the first spring 9 that is away from the top block 8 is connected to the bottom surface of the sliding groove 10.

[0030] Furthermore, a first hydraulic chamber 11 and a second hydraulic chamber are spaced apart inside the valve cover 2. One of the limiting plates 4 in each set is connected to the first hydraulic chamber 11, and the other limiting plate 4 is connected to the second hydraulic chamber. Hydraulic oil is filled into both the first hydraulic chamber 11 and the second hydraulic chamber.

[0031] Furthermore, the first hydraulic chamber 11 is connected to the oil injection hole 12 opened on the upper end face of the first flange 6, and a one-way hydraulic valve is provided on the oil injection hole 12.

[0032] Furthermore, a slot 13 is provided on the side wall of the positioning plate 5 near the center of the drive bracket 3, and a groove 14 is provided on the side wall of the sleeve 7 between each set of limiting plates 4. A locking block 15 is slidably arranged in the groove 14. One end of the locking block 15 extending into the groove 14 is connected to a second spring 16. The end of the second spring 16 away from the locking block 15 is connected to the bottom surface of the groove 14. The locking block 15 is engaged with the slot 13.

[0033] Furthermore, a wedge-shaped engaging portion 17 is provided at one end of the locking block 15 extending outside the groove 14. The engaging portion 17 engages within the locking groove 13, and the upper end surface 18 of the engaging portion 17 is a slope.

[0034] Furthermore, the two sides 19 of the positioning plate 5 are symmetrically arranged inclined surfaces, and the sides 19 are inclined towards the center of the positioning plate 5 in a direction from bottom to top. The end face 20 of the top block 8 opposite to the positioning plate 5 is an inclined surface, and the inclination angles of the sides 19 and the end face 20 are the same.

[0035] The working principle of the above technical solution: A valve cover 2 is detachably installed at the upper opening of the valve body 1 of the flat valve. A drive bracket 3 is connected to the valve cover 2. The drive device is installed on the drive bracket 3. The drive device provides power for raising or lowering the valve plate of the flat valve and provides torque. The nut connected to the drive device is connected to the screw 100. The screw 100 is connected to the valve plate. When the drive device drives the nut to rotate, the valve plate is raised or lowered through the screw 100.

[0036] The flat plate valve opens and closes frequently, and the load is transmitted to the valve cover through the drive bracket 3. Due to the impact load of the drive device when the flat plate valve opens and closes, and the torque direction of the load when the flat plate valve opens and closes is opposite, the drive bracket 3 and the valve cover 2 are constantly affected by positive and negative torques when the flat plate valve is frequently opened and closed. The tendency of torsion between the two is constantly increasing, and the continuous impact load will cause the bolts and nuts connecting the valve cover 2 and the drive bracket 3 to loosen. If the drive bracket 3 and the valve cover 2 rotate, the bolts will be sheared or even broken.

[0037] To reduce the torsional tendency between the drive bracket 3 and the valve cover 2, a support structure is provided between the drive bracket 3 and the valve cover. When the drive device opens or closes the valve, the torsional tendency of the drive bracket 3 relative to the valve cover 2 is suppressed, so that the connection between the drive bracket 3 and the valve cover 2 is maintained and the connection between the drive device 3 and the valve cover 2 is prevented from failing.

[0038] The drive unit can be selected from electric drive units, hydraulic drive units, or other power units that can provide torque, depending on the specific application conditions, operating frequency, safety requirements, environmental conditions, and available power sources of the flat panel valve. Electric drive units can be bidirectional motors, which are widely used, have precise control, and long signal transmission distances, making them suitable for remote control. Hydraulic drive units can be hydraulic motors, which can provide greater torque, are suitable for large-diameter flat panel valves, and offer smooth operation and good rigidity.

[0039] The support structure includes a limiting plate 4 disposed on the valve cover 2 and a positioning plate 5 disposed at the lower part of the drive bracket 3. The valve cover includes a first flange 6 and a sleeve 7. The two limiting plates 4 are disposed opposite to each other on the outer circumferential surface of the sleeve 7. The positioning plate 5 is located between the two oppositely disposed limiting plates 4. The two oppositely disposed limiting plates 4 clamp the positioning plate 5 in the middle, thereby limiting the rotation tendency of the drive bracket 3 and improving the stability of the drive bracket.

[0040] Two limiting plates 4 are arranged opposite each other to form a group. Multiple groups of limiting plates 4 are arranged in a circumferential array on the outer circumference of the sleeve 7. Multiple positioning plates 5 are arranged in a circumferential array at the lower part of the drive bracket 3. The number of positioning plates 5 is the same as the number of groups of limiting plates 4. The circumferential array of limiting plates 4 arranged in pairs opposite each other is arranged on the outer circumference of the sleeve 7. A positioning plate 5 is inserted between two limiting plates 4 in each group. By inserting multiple positioning plates 5 between multiple groups of limiting plates 4, the ability to prevent the drive bracket 3 from rotating in the circumferential direction is further improved.

[0041] Positioning plate 5 is in direct contact with limiting plate 4. When the drive device is working, the drive bracket is subjected to impact load. When the drive bracket 3 has a tendency to rotate, positioning plate 5 and limiting plate 4 are in direct contact. The impact is directly transmitted to valve body 1 through valve cover 2. The vibration of valve body 1 will affect the flow state of the internal fluid, causing the fluid flow to form an unsteady flow, which will have an adverse effect on the flat valve or pipeline.

[0042] Each set of limiting plates 4 has clamping components symmetrically arranged on opposite sides. The clamping components clamp the positioning plates 5 from both sides. When the drive bracket 3 has a tendency to rotate, the clamping components provide a reverse torque to prevent the drive bracket 3 from rotating. While clamping the positioning plates 5, the clamping components can also reduce the vibration transmitted by the drive device through the drive bracket 3.

[0043] The clamping assembly includes a top block 8 and a first spring 9. Each set of limiting plates 4 has a sliding groove 10 on its opposite side. The top block 8 is slidably disposed within the sliding groove 10. The first spring 9 is installed at one end of the top block 8 that enters the sliding groove 10. The end of the first spring 9 away from the top block 8 is connected to the bottom surface of the sliding groove 10. A first hydraulic chamber 11 and a second hydraulic chamber are spaced apart inside the valve cover 2. One limiting plate 4 in each set of limiting plates 4 communicates with the first hydraulic chamber 11, and the other limiting plate 4 communicates with the second hydraulic chamber. Both the first and second hydraulic chambers are filled with hydraulic oil. The first hydraulic chamber 11 communicates with an oil injection hole 12 on the upper surface of the first flange 6. A one-way hydraulic valve is installed on the oil injection hole 12. After the drive bracket 3 is installed on the valve cover 2, all positioning plates 5 are inserted between each set of limiting plates 4. Then, hydraulic oil is injected into the first and second hydraulic chambers through the one-way hydraulic valve. The pressure of the hydraulic oil can be set to 0.5-3.5 MPa.

[0044] The top block 8 is sealed to the limiting plate 4, and a circumferential sealing groove can be opened in the slide groove 10, and a sealing ring is set in the sealing groove.

[0045] After hydraulic oil is fully injected into the first hydraulic chamber 11 and the second hydraulic chamber, the top block 8 moves outward from the slide groove 10 under the pressure of the hydraulic oil. The end of the top block 8 presses tightly against both sides of the positioning plate 5, so that the positioning plate 5 remains stable relative to the valve cover 2, thereby improving the stability of the connection between the drive bracket 3 and the valve cover 2. When the drive device is working, starting or closing the flat valve, when the drive bracket 3 is subjected to the torque of the drive device and has a rotational tendency, the top block provides a reverse torque to suppress the rotational tendency of the drive bracket 3.

[0046] Hydraulic oil is injected into the first hydraulic chamber 11 and the second hydraulic chamber. Besides stabilizing the drive bracket 3, it also buffers the impact of starting the drive device and reduces vibration. The hydraulic oil should be a high-grade anti-wear hydraulic oil with anti-foaming and air-releasing properties, such as HM hydraulic oil. If air bubbles are mixed in the oil, they will be compressed under pressure, leading to unstable pressure transmission, delayed buffering force, or noise, severely weakening the buffering effect. HM oil contains specialized anti-foaming additives, which can provide stable pressure to the top block 8.

[0047] The second hydraulic chamber (not shown in the figure) is spaced apart from the first hydraulic chamber and the two are not connected. The second hydraulic chamber has a separate oil inlet, and the working principle of the second hydraulic chamber is the same as that of the first hydraulic chamber.

[0048] HM hydraulic oil has good anti-wear properties, which can protect the walls of the first hydraulic chamber 11 and the second hydraulic chamber, as well as components such as the top block and slide groove that may move. Its viscosity is relatively stable at different operating temperatures, ensuring consistent pressurization and buffering performance.

[0049] Since the flat plate valve is opened or closed when the drive device rotates in the forward or reverse direction, top blocks 8 are respectively provided on the opposite sides of the limit plate 4. This can provide torque in different directions when the drive device starts or closes the flat plate valve to adapt to the forward or reverse rotation of the drive device.

[0050] When the drive device drives the nut to rotate, the nut and the screw 100 cooperate. The nut rotates, and the screw only moves axially. When the valve plate is lifted, the drive bracket 3 and the valve cover 2 are compressed. When the valve plate is pressed down, the drive bracket 3 and the valve cover 2 are stretched, which increases the axial tension of the bolt connecting the drive bracket 3 and the valve cover 2. A slot 13 is opened on the side wall of the positioning plate 5 near the center of the drive bracket 3. A groove 14 is opened on the side wall of the sleeve 7 between each set of limiting plates 4. A locking block 15 is slidably arranged in the groove 14. One end of the locking block 15 extending into the groove 14 is connected to a second spring 16. The end of the second spring 16 away from the locking block 15 is connected to the bottom surface of the groove 14. The 15 is engaged with the slot 13. One end of the 15 extending outside the groove 14 is provided with a wedge-shaped engaging part 17. The engaging part 17 is engaged in the slot 13. The upper end face 18 of the engaging part 17 is inclined. When the drive bracket 3 is installed, the lower end of the positioning plate 5 contacts the inclined surface of the engaging part 17 and pushes the 15 into the groove 14. After the slot 13 passes the engaging part 17, the 15 is no longer subjected to the force on the bottom surface of the groove 14. Under the action of the elastic force of the second spring 16, it moves to the outside of the groove 14, so that the engaging part 17 enters the slot 13. The engaging part 17 engages the positioning plate 5 through the slot 13, thereby sharing the axial force between the drive bracket 3 and the valve cover 2 when the flat valve is closed.

[0051] In order to share the axial force between the drive bracket 3 and the valve cover 2 when the flat valve is closed, the two sides of the positioning plate 5 can also be set as inclined surfaces. The two sides set as inclined surfaces are located on the circumferential direction of the drive bracket 3, and the other two sides are the sides close to and far from the center of the drive bracket, respectively.

[0052] The inclined surface slopes towards the center of the positioning plate 5 from bottom to top. The end face 20 of the top block 8 opposite to the side of the positioning plate 5 is set as an inclined surface. The inclined surface and the inclined surface have the same inclination angle, so that when the top block 8 is pressed against the positioning plate 5, the inclined surface and the inclined surface are completely in contact. While the top blocks 8 on both sides of the positioning plate 5 provide clamping force to the positioning plate 5, the downward force of the inclined surface provides axial downward pressure to the positioning plate 5, making the connection between the drive bracket 3 and the valve cover 2 more stable.

[0053] The inclination angle of the inclined surface and the ramp can be set to be less than the friction angle between the top block 8 and the positioning plate 5. When the hydraulic oil pushes the top block 8 against the positioning plate 5, a self-locking mechanism is formed between the inclined surface and the ramp, improving the stability of the drive bracket 3. When it is necessary to disassemble the drive bracket 3, the hydraulic oil in the first hydraulic chamber 11 and the second hydraulic chamber is depressurized, and the top block 8 retracts into the slide groove 10 under the tension of the first spring 9. The initial position of the top block 8 is such that the end of the top block 8 away from the first spring 9 does not extend beyond the slide groove 10, preventing the top block 8 from extending beyond the slide groove 10 and affecting the insertion of the positioning plate 5 between the two limiting plates 4. After the drive bracket 3 is installed, the top block 8 moves outward from the slide groove 10 under the pressure of the hydraulic oil, and the end of the top block 8 away from the first spring 9 contacts the side of the positioning plate 5, thereby locking the positioning plate 5.

[0054] On an inclined plane, when the angle between the resultant force of friction and pressure and the normal of the inclined plane is equal to the friction angle, its tangent value is equal to the static friction coefficient. When the inclination angle of the inclined plane is less than the friction angle, the component of the pressure between the inclined plane and the inclined plane along the contact surface between them cannot overcome the maximum static friction, so that the positioning plate 5 keeps the top block 8 stationary, resulting in self-locking.

[0055] The beneficial effects of the above technical solution are as follows: The anti-torsion flat valve with a multi-point support structure of the present invention has a support structure between the valve cover and the drive bracket. When the drive device opens or closes the valve, it can suppress the torsional tendency of the drive bracket relative to the valve cover, reduce vibration, and prevent the bolts connecting the valve cover and the drive bracket from being sheared or loosened.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A torsion-resistant flat plate valve with a multi-point support structure, characterized in that, The valve includes a valve body (1), a valve cover (2), and a drive bracket (3). The valve cover (2) is detachably connected to the opening at the upper end of the valve body (1). The drive bracket (3) is disposed on the valve cover (2). A support structure is provided between the drive bracket (3) and the valve cover (2). The support structure is configured to suppress the torsional tendency of the drive bracket (3) relative to the valve cover (2) when the drive device opens or closes the valve.

2. The anti-torsion flat valve with a multi-point support structure according to claim 1, characterized in that, The support structure includes a limiting plate (4) on the valve cover (2) and a positioning plate (5) on the lower part of the drive bracket (3). The valve cover includes a first flange (6) and a sleeve (7). The two limiting plates (4) are disposed opposite to each other on the outer circumferential surface of the sleeve (7), and the positioning plate (5) is located between the two oppositely disposed limiting plates (4).

3. The anti-torsion flat valve with a multi-point support structure according to claim 2, characterized in that, Two limiting plates (4) are arranged opposite each other to form a group, and multiple groups of limiting plates (4) are arranged in a circular array on the outer circumferential surface of the sleeve (7); Multiple positioning plates (5) are arranged in a circular array at the lower part of the drive bracket (3), and the number of positioning plates (5) is the same as the number of groups of limiting plates (4).

4. The anti-torsion flat valve with a multi-point support structure according to claim 3, characterized in that, Each set of limiting plates (4) has clamping components symmetrically arranged on opposite sides. The clamping components clamp the positioning plates (5) from both sides. When the drive bracket (3) has a tendency to rotate, the clamping components provide a reverse torque to prevent the drive bracket (3) from rotating.

5. The anti-torsion flat valve with a multi-point support structure according to claim 4, characterized in that, The clamping assembly includes a top block (8) and a first spring (9). Each set of limiting plates (4) has a sliding groove (10) on its opposite side. The top block (8) is slidably disposed in the sliding groove (10). The first spring (9) is disposed at one end of the top block (8) that enters the sliding groove (10). The end of the first spring (9) away from the top block (8) is connected to the bottom surface of the sliding groove (10).

6. The anti-torsion flat valve with a multi-point support structure according to claim 5, characterized in that, The valve cover (2) has a first hydraulic chamber (11) and a second hydraulic chamber spaced apart. One of the limiting plates (4) in each set of limiting plates (4) is connected to the first hydraulic chamber (11), and the other limiting plate (4) is connected to the second hydraulic chamber. Both the first hydraulic chamber (11) and the second hydraulic chamber are filled with hydraulic oil.

7. The anti-torsion flat valve with a multi-point support structure according to claim 6, characterized in that, The first hydraulic chamber (11) is connected to the oil injection hole (12) on the upper end face of the first flange (6), and a one-way hydraulic valve is provided on the oil injection hole (12).

8. The anti-torsion flat valve with a multi-point support structure according to claim 6, characterized in that, A slot (13) is opened on the side wall of the positioning plate (5) near the center of the drive bracket (3). A groove (14) is opened on the side wall of the sleeve (7) between each set of limiting plates (4). A locking block (15) is slidably set in the groove (14). One end of the locking block (15) extending into the groove (14) is connected to a second spring (16). The end of the second spring (16) away from the locking block (15) is connected to the bottom surface of the groove (14). The locking block (15) is engaged with the slot (13).

9. The anti-torsion flat valve with a multi-point support structure according to claim 8, characterized in that, The end of the locking block (15) extending outside the groove (14) is provided with a wedge-shaped locking part (17), which is locked in the slot (13). The upper end surface (18) of the locking part (17) is a slope.

10. The anti-torsion flat valve with a multi-point support structure according to claim 5, characterized in that, The two sides (19) of the positioning plate (5) are symmetrically arranged inclined surfaces. The side (19) is inclined towards the center of the positioning plate (5) in the direction from bottom to top. The end face (20) of the top block (8) opposite to the positioning plate (5) is an inclined surface. The inclination angle of the side (19) and the end face (20) is the same.

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