A self-preloaded elastic double-layer wedge gate valve

Abstract

This invention relates to the field of valve technology, and in particular to a self-pre-tightening resilient double-layer wedge gate valve. This invention, by incorporating a movable plate that scales and retracts with the gate assembly, and in conjunction with a limiting ring within the transverse channel, horizontally intercepts the fluid. This not only eliminates the angle between the clamping force and the fluid movement direction, but also significantly improves the overall sealing effect of the gate valve through the dual interception method of the movable plate abutting against the limiting ring and the baffle abutting against the transverse channel, effectively preventing fluid overflow.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a self-pre-tightening elastic double-layer wedge gate valve. Background Technology

[0002] Existing wedge gate valves, whether using an integrated or separate gate, operate on the principle of decomposing the vertical force applied by the valve stem into two components perpendicular to the gate surface using a wedge structure. The gate, under this force, blocks the passage, intercepting the horizontally flowing fluid. However, the direction of the clamping force on the gate valve forms an angle with the direction of fluid movement, preventing the valve stem from exerting its maximum interception force. Over time, insufficient clamping force can lead to gate valve seal failure. Therefore, a self-pre-tightening, resilient double-layer wedge gate valve is needed. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a self-pre-tightening elastic double-layer wedge gate valve with double-layer interception function and better sealing effect.

[0004] To achieve the above objectives, the technical solution of the present invention is: a self-pre-tightening elastic double-layer wedge gate valve, comprising a valve body and a gate assembly. The valve body is provided with a vertically intersecting transverse channel and a longitudinal channel. The transverse channel is used to connect to a pipeline. The gate assembly is disposed in the longitudinal channel. The gate assembly can be movably inserted into the transverse channel and intercept the fluid flowing through the transverse channel. The gate assembly includes a valve stem, a connecting plate, a baffle, and a movable lock module. The valve stem slidably passes through the connecting plate. Two baffles are symmetrically arranged in an inverted V-shape on the left and right sides of the connecting plate. Limiting rings are symmetrically arranged on the left and right sides of the gate assembly in the transverse channel. A movable plate is rotatably provided on one side of the baffle. An arc-shaped support plate is rotatably provided on the side of the movable plate near the baffle. The baffle has a movable hole. The other side of the arc-shaped support plate passes through the movable hole and is rotatably connected to the valve stem. The movable lock module connects the valve stem and the baffle. When the baffle is embedded in the transverse channel, the movable lock module disconnects the fixed connection between the valve stem and the baffle, further controlling the valve stem to move downward so that the movable plate deflects and abuts against the limiting rings, realizing double-layer interception in the transverse channel.

[0005] Furthermore, the movable lock module includes a positioning block, a limiting plate, and a release assembly. The positioning block is fixed to the valve stem, the limiting plate is located between two baffles, and the limiting plate has an opening through which the positioning block can pass. Symmetrical ribs are provided inside the valve body, and the front and rear sides of the limiting plate are slidably connected to the ribs. Two release assemblies are symmetrically located on the front and rear sides of the limiting plate. Each release assembly includes a barb, a rotating rod, a support rod, a limiting sleeve, a ball bearing, and a spring. The positioning block has a groove, the barb is located on one side of the rotating rod, and the rotating rod is rotatably connected to the side wall of the opening. A return spring is provided at the connection point, which provides a preload force to the barb into the groove; an extension plate is provided on the other side of the rotating rod, one end of the support rod corresponds to the extension plate, and the other end of the support rod contacts the ball. The limiting sleeve is fitted on the side wall of the limiting plate and on the other end of the support rod. The spring elastically connects the support rod and the limiting sleeve, and the spring provides a preload force to the support rod, thereby causing the ball to extend from one side of the limiting plate. A trapezoidal protrusion is provided on the rib. When the ball moves to the trapezoidal protrusion, the support rod pokes the extension plate and deflects, thereby causing the barb to leave the groove.

[0006] Furthermore, the gate valve also includes a spring plug, which is located below the connecting plate and connected to the bottom end of the valve stem. Both the front and rear sides of the spring plug are provided with a U-shaped part that can be slidably connected to the rib. The spring plug is a column with an hourglass-shaped cross-section, and the upper part of the spring plug is placed between two baffles.

[0007] Furthermore, the movable lock module also includes a support ring. Below the positioning block is a frustum-shaped base with a bottom diameter larger than the diameter of the opening. The base is made of silicone and has an annular groove at its bottom. The support ring is movably embedded in the annular groove. Both the front and rear sides of the support ring are provided with U-shaped parts II, which are slidably connected to the left and right sides of the rib. There are two trapezoidal protrusions, which are respectively located at the positions of the gate assembly when the gate valve is in the closed and open states. When the gate valve is in the open state, the gate assembly leaves the transverse channel. The ball is squeezed by the trapezoidal protrusion at the higher position, causing the valve stem and the baffle to disconnect. At the same time, the rib intercepts the support ring, causing the support ring to separate from the base. The valve stem moves further upward, causing the elastic plug to fit against the bottom of the connecting plate.

[0008] Furthermore, the gate assembly also includes an arc-shaped plate, which is disposed above the positioning block with its convex surface facing upward and is fixedly connected to the valve stem. The baffle plate is provided with a protrusion that can intercept the arc-shaped plate.

[0009] Furthermore, the gate valve also includes a handwheel, which is rotatably located at the top of the longitudinal channel and is threadedly connected to one side of the valve stem. Rotating the handwheel causes the valve stem to rise or fall.

[0010] Furthermore, the longitudinal channel includes a moving part and a transfer part. The moving part is located above the transfer part, and a sealing packing is provided between the moving part and the transfer part. The valve stem passes through the transfer part, the sealing packing and the moving part in sequence and is connected to the handwheel. The transfer part has a cavity inside, and the cross-section of the cavity is a trapezoid with a narrow top and a wide bottom. When the gate valve is in the open state, the two cover plates on the gate assembly abut against the side wall of the cavity.

[0011] By adopting the above technical solution, the beneficial effects of the present invention are: 1. This invention, by setting a movable plate that can scale as the gate assembly moves, in conjunction with a limiting ring set in the transverse channel, intercepts the fluid horizontally. This not only eliminates the angle between the clamping force and the fluid movement direction, but also, through the dual interception method of the movable plate abutting against the limiting ring and the baffle abutting against the transverse channel, greatly improves the sealing effect of the entire gate valve and effectively prevents fluid overflow. The arc-shaped support plate, by transmitting the movement of the valve stem, causes the movable plate to deflect. While ensuring force transmission between the valve stem and the movable plate, the arc-shaped support plate, which can undergo a small range of elastic deformation, also promotes the separation between the movable plate and the limiting ring, facilitating gate opening.

[0012] 2. This invention limits the vertical movement of the gate assembly within the valve body by setting a rib, and uses the linkage between the ball and the trapezoidal protrusion on the rib to unlock the movable lock module, thereby achieving the positioning and separation of the valve stem and the baffle, simplifying the operation.

[0013] 3. By setting an elastic plug with an hourglass-shaped cross-section, the present invention seals the connection between the connecting plate and the valve stem when the gate valve is in the open state. It also increases the contact between the bottom of the gate assembly and the valve body, reduces the vibration effect of the gate assembly in the valve body, and expands the bottom of the two baffles when the gate valve is in the closed state, increasing the contact force between the baffles and the transverse channel at the bottom, thus improving the sealing effect.

[0014] 4. By setting a trapezoidal cavity that is narrower at the top and wider at the bottom, the present invention increases the contact points of the gate assembly when the gate valve is in the open state, thereby reducing the vibration of the gate in the valve body.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0016] Undoubtedly, such and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiments, which are illustrated in various accompanying drawings and figures.

[0017] To make the above and other objects, features and advantages of the present invention more apparent and understandable, one or more preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0019] In the accompanying drawings, the same parts use the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on such drawings without creative effort.

[0021] Figure 1 This is a side view of the internal structure of a self-pre-tightening elastic double-layer wedge gate valve of the present invention when it is in the closed state; Figure 2 This is a side view of the internal structure of a self-pre-tightening elastic double-layer wedge gate valve of the present invention when it is in the open state; Figure 3 This is a schematic diagram of the gate assembly structure of a self-pre-tightening elastic double-layer wedge gate valve according to the present invention; Figure 4 This is a schematic diagram of the gate assembly of a self-pre-tightening elastic double-layer wedge gate valve according to the present invention; Figure 5 This is a schematic diagram showing the separation of the gate assembly structure of a self-pre-tightening elastic double-layer wedge gate valve according to the present invention; Figure 6 This is a schematic diagram of the release assembly structure of a self-pre-tightening elastic double-layer wedge gate valve according to the present invention; Figure 7 This is a side view of the release assembly of a self-pre-tightening elastic double-layer wedge gate valve according to the present invention; Figure 8 This is a schematic diagram of the top of the protruding rib of a self-pre-tightening elastic double-layer wedge gate valve according to the present invention; Figure 9 This is a schematic diagram of the U-shaped component 2 in the separated state of a self-pre-tightening elastic double-layer wedge gate valve according to the present invention.

[0022] Explanation of key figure labels: 1. Valve body; 11. Limiting ring; 12. Convex ribs; 121. Trapezoidal protrusion; 13. Mobility Unit; 14. Transfer Department; 15. Sealing packing; 2. Gate assembly; 21. Valve stem; 22. Connecting plate; 23. Baffle plate; 231. Movable hole; 232. Convex part; 24. Active lock module; 241. Positioning block; 411. Groove; 412. Base; 413. Annular groove; 242. Limiting plate; 421. Opening; 243. Release assembly; 431. Barb; 432. Rotating rod; 433. Support rod; 434. Limiting sleeve; 435. Rolling ball one; 436. Spring one; 437. Extension plate; 244. Support ring; 441. U-shaped part two; 25. Movable board; 26. Arc-shaped support plate; 3. Elastic plug; 31. U-shaped part one; 5. Curved plate; 6. Handwheel. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] Reference Figure 1-9 The present invention provides a technical solution: a self-pre-tightening elastic double-layer wedge gate valve, which is installed between pipelines to control the connection state of the pipelines.

[0025] The gate valve includes a valve body 1, a gate assembly 2, and a handwheel 6. The valve body 1 has vertically intersecting transverse and longitudinal channels. The transverse channels are used for connection to pipelines. The gate assembly 2 is located within the longitudinal channel, which includes a moving part 13 and a transferring part 14. The moving part 13 is located above the transferring part 14, and a sealing packing 15 is provided between the moving part 13 and the transferring part 14. The valve stem 21 is connected to the gate assembly 2, and one end passes sequentially through the transferring part 14, the sealing packing 15, and the moving part 13 before connecting to the handwheel 6. The connection between the valve stem 21 and the handwheel 6 is as follows: the handwheel 6 is rotated to the top of the longitudinal channel, and the handwheel 6 is threaded to one side of the valve stem 21. Because the gate assembly 2 can only slide up and down under the limitation of the protruding rib 12 on the side wall of the valve body 1, rotating the handwheel 6 causes the valve stem 21 to rise or fall. This is the working principle of a rising stem valve. The presence of the protruding rib 12 is existing technology, and whether or not it is disclosed will not affect the normal operation of the equipment. The transfer section 14 has an internal cavity for housing the gate assembly 2 when the gate valve is in the open state. The gate assembly 2 includes a valve stem 21, a connecting plate 22, a baffle 23, and a movable lock module 24. The valve stem 21 slidably passes through the connecting plate 22, and a sealing packing 15 supporting sliding is provided at the connection point if necessary. Two baffles 23 are symmetrically arranged on the left and right sides of the connecting plate 22 in an inverted V shape. A limit ring 11 is symmetrically provided on the left and right sides of the gate assembly 2 via a transverse channel. A movable plate 25 that can cover the limit ring 11 is rotatably provided on one side of the baffle 23. To achieve linkage between the deflection of the movable plate 25 and the position of the gate assembly 2, an arc-shaped support plate 26 is rotatably provided on the side of the movable plate 25 near the baffle 23. The convex surface of the arc-shaped support plate 26 is set downward. A movable hole 231 is provided on the baffle 23. The other side of the arc-shaped support plate 26 passes through the movable hole 231 and is rotatably connected to the valve stem 21. If necessary, a channel for its deflection is reserved on the arc-shaped support plate 26. The movable locking module 24 connects the valve stem 21 and the baffle plate 23. After the gate assembly 2 reaches the target position, the movable locking module 24 controls whether the valve stem 21 and the baffle plate 23 are in a connected state. For example, when the baffle plate 23 is embedded in the transverse channel, the movable locking module 24 disconnects the fixed connection between the valve stem 21 and the baffle plate 23. At this time, the valve stem 21 can be further controlled to move downward, causing the movable plate 25 to deflect and abut against the limit ring 11, thereby achieving double-layer interception in the transverse channel.

[0026] The movable lock module 24 specifically includes a positioning block 241, a limiting plate 242, and a release assembly 243. The positioning block 241 is fixed to the valve stem 21, and the limiting plate 242 is located between two baffles 23. The limiting plate 242 has an opening 421 through which the positioning block 241 can pass. Ribs 12 are symmetrically arranged inside the valve body 1. The front and rear sides of the limiting plate 242 are slidably connected to the ribs 12. Specifically, a sliding groove is provided on the front side wall of the rib 12, and the front and rear ends of the limiting plate 242 are slidably embedded in the sliding groove. Two release components 243 are symmetrically arranged on the front and rear sides of the limiting plate 242. The release component 243 includes a barb 431, a rotating rod 432, a support rod 433, a limiting sleeve 434, a ball bearing 435, and a spring 436. The positioning block 241 is provided with a groove 411. The barb 431 is located on one side of the rotating rod 432. The rotating rod 432 is rotatably connected to the side wall of the opening 421, and a return spring (not shown in the figure) is provided at the connection between the two. The return spring provides a preload force for the barb 431 to be embedded in the groove 411. An extension plate 437 is provided on the other side of the rotating rod 432. One end of the support rod 433 corresponds to the extension plate 437, and the other end of the support rod 433 contacts the first rolling ball 435. A limiting sleeve 434 is provided on the side wall of the limiting plate 242 and sleeved on the other end of the support rod 433. A spring 436 elastically connects the support rod 433 and the limiting sleeve 434. The spring 436 provides a preload force to the support rod 433, thereby causing the first rolling ball 435 to extend from one side of the limiting plate 242. A trapezoidal protrusion 121 is provided on the rib 12. If necessary, a groove corresponding to the first rolling ball 435 is provided on the trapezoidal protrusion 121. When the first rolling ball 435 moves to the trapezoidal protrusion 121, the support rod 433 abuts the extension plate 437 to deflect, thereby causing the barb 431 to leave the groove 411.

[0027] To increase the resistance of the gate valve to the transverse passage when closed, and also to improve the sealing effect and shock resistance when open, the gate valve also includes a spring-loaded plug 3. The spring-loaded plug 3 is located below the connecting plate 22 and connected to the bottom end of the valve stem 21. Both the front and rear sides of the spring-loaded plug 3 are equipped with U-shaped parts 31 that can slide with the raised rib 12. The spring-loaded plug 3 is a cylindrical shape with an hourglass-shaped cross-section, and the upper half of the spring-loaded plug 3 is positioned between the two baffles 23.

[0028] When the gate valve is in the closed state, the spring plug 3 is subjected to force as the valve stem 21 moves further down, causing its upper part to slightly open the two baffles 23, so as to increase the resistance of the gate valve to the transverse channel when it is closed.

[0029] When the gate valve is in the open state, the spring plug 3 is subjected to force during the further upward movement of the valve stem 21 until it is tightly fitted with the lower end of the connecting plate 22. At the same time, its lower half will still slightly prop open the two baffles 23 to increase the sealing effect and shock resistance of the gate valve in the open state. There will be resistance in the sliding connection between the valve stem 21 and the connecting plate 22, so the movable lock module 24 only plays the role of assisting the connection between the two. However, because the fluid will have a strong gripping force on the gate assembly 2 during the process of opening and closing the gate, in order to ensure the stability of the connection between the valve stem 21 and the baffle 23 when they move upward, the movable lock module 24 also includes a support ring 244. A frustum-shaped base 412 is provided below the positioning block 241. The bottom diameter of the base 412 is larger than the diameter of the opening 421. During the upward movement, the base 412 will support the limit plate 242 to move upward. There are two trapezoidal protrusions 121, which are respectively located at the corresponding positions of the gate assembly 2 when the gate valve is in the closed state and the open state. To prevent the base 412, located below the limit plate 242, from affecting the relative displacement between the valve stem 21 and the baffle 23 when the valve is open, the base 412 is made of silicone. The bottom of the base 412 has an annular groove 413, into which the support ring 244 is movably embedded. After separating from the support ring 244, the base 412 can deform and enter the opening 421. To achieve a fixed-point separation between the support ring 244 and the annular groove 413, U-shaped parts 441 are provided on both the front and rear sides of the support ring 244. The U-shaped parts 441 are slidably connected to the left and right sides of the rib 12. When the gate assembly 2 leaves the transverse channel, the ball 435 is squeezed by the trapezoidal protrusion 121 located at the higher position, causing the valve stem 21 and the baffle 23 to disconnect. (Refer to...) Figure 8 Because the sliding track of the U-shaped part 441 only reaches below the trapezoidal protrusion 121 located at the higher position, the protruding rib 12 will intercept the support ring 244 at this time, causing the support ring 244 to separate from the base 412. If necessary, refer to Figure 9 The U-shaped part 441 has protrusions that can be slidably embedded in the left and right sides of the rib 12. Then, a ball 2 and a spring 2 are set on the protrusions. At the same time, a groove is set at the fixed point of separation of the two on the rib 12. When the U-shaped part 441 reaches this groove, the ball 2 will achieve temporary positioning of the support ring 244 after it is blocked by the spring 2.

[0030] If necessary, the cross-section of the cavity can be made into a trapezoid with a narrow top and a wide bottom. When the gate valve is in the open state, the two cover plates on the gate assembly 2 abut against the side wall of the cavity.

[0031] If necessary, the gate assembly 2 may also include an arc-shaped plate 5, which is disposed above the positioning block 241 with its convex surface facing upward and is fixedly connected to the valve stem 21. The baffle 23 is provided with a protrusion 232 that can intercept the arc-shaped plate 5. As the valve stem 21 moves further downward, the arc-shaped plate 5 will deform against the protrusion 232, thereby expanding the two baffles 23 above the connecting plate 22 to increase their abutment force on the transverse channel.

[0032] Working principle: During the gate valve closing process, rotating the handwheel 6 causes the valve stem 21 to move the gate assembly 2 downward until the baffle 23 engages with the transverse channel. The ball 435 interacts with the trapezoidal protrusion 121 located below, which unlocks the valve body 1 from the baffle 23. This further causes the valve stem 21 to move downward, which in turn causes the arc-shaped support plate 26 to move downward while deflecting and opening the movable plate 25 to abut against the limit ring 11. At this time, the elastic plug 3 and the arc-shaped plate 5 act inside the baffle 23 to increase its contact with the transverse channel. During the opening of the gate valve, rotating the handwheel 6 causes the valve stem 21 to move the gate assembly 2 upward. The arc-shaped support plate 26 moves upward while simultaneously resetting the movable plate 25 until the ball 435 separates from the trapezoidal protrusion 121 located at the lower position. The valve stem 21 and the baffle 23 are locked and move upward synchronously under the support of the base 412 until the gate leaves the transverse channel. The ball 435 interacts with the trapezoidal protrusion 121 located at the upper position, causing the valve body 1 and the baffle 23 to unlock again. At this time, the support ring 244 is also separated from the limiting groove under the interception of the rib 12. The valve stem 21 moves upward further, causing the base 412 to deform and embed into the opening 421. At this time, the elastic plug 3 is in contact with the bottom of the connecting plate 22.

[0033] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0034] The term "embodiment" in this specification refers to a specific feature or characteristic described in connection with an embodiment that is included in at least one embodiment of the invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0035] Furthermore, the described features or characteristics can be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented without the aforementioned specific details or may be implemented using other methods, components, materials, etc.

Claims

1. A self-pre-tightening elastic double-layer wedge gate valve, characterized in that, The device includes a valve body and a gate assembly. The valve body has a vertically intersecting transverse channel and a longitudinal channel. The transverse channel is used to connect to a pipeline. The gate assembly is located in the longitudinal channel and can be movably inserted into the transverse channel to intercept the fluid flowing through the transverse channel. The gate assembly includes a valve stem, a connecting plate, a baffle, and a movable lock module. The valve stem slidably passes through the connecting plate. Two baffles are symmetrically arranged in an inverted V-shape on the left and right sides of the connecting plate. Limiting rings are symmetrically arranged on the left and right sides of the gate assembly in the transverse channel. A movable plate is rotatably provided on one side of the baffle. An arc-shaped support plate is rotatably provided on the side of the movable plate near the baffle. The baffle has a movable hole. The other side of the arc-shaped support plate passes through the movable hole and is rotatably connected to the valve stem. The movable lock module connects the valve stem and the baffle. When the baffle is embedded in the transverse channel, the movable lock module disconnects the fixed connection between the valve stem and the baffle, further controlling the valve stem to move downward so that the movable plate deflects and abuts against the limiting rings, realizing double-layer interception in the transverse channel.

2. The self-pre-tightening elastic double-layer wedge gate valve according to claim 1, characterized in that, The movable lock module includes a positioning block, a limiting plate, and release components. The positioning block is fixed to the valve stem, and the limiting plate is located between two baffles. The limiting plate has an opening through which the positioning block can pass. The valve body has symmetrically arranged ribs inside, and the front and rear sides of the limiting plate are slidably connected to the ribs. Two release components are symmetrically arranged on the front and rear sides of the limiting plate. Each release component includes a barb, a rotating rod, a support rod, a limiting sleeve, a ball bearing, and a spring. The positioning block has a groove, and the barb is located on one side of the rotating rod. The rotating rod is rotatably connected to the side wall of the opening and the connection between the two is... A return spring is provided at the joint, which provides a preload force to the barb into the groove; an extension plate is provided on the other side of the rotating rod, one end of the support rod corresponds to the extension plate, and the other end of the support rod contacts the ball. A limiting sleeve is provided on the side wall of the limiting plate and on the other end of the support rod. A spring elastically connects the support rod and the limiting sleeve, and the spring provides a preload force to the support rod, thereby causing the ball to extend from one side of the limiting plate. A trapezoidal protrusion is provided on the rib. When the ball moves to the trapezoidal protrusion, the support rod pokes the extension plate to deflect, thereby causing the barb to leave the groove.

3. The self-pre-tightening elastic double-layer wedge gate valve according to claim 2, characterized in that, It also includes a spring plug, which is located below the connecting plate and connected to the bottom end of the valve stem. Both the front and rear sides of the spring plug are provided with a U-shaped part that can be slidably connected to the rib. The spring plug is a column with an hourglass-shaped cross-section, and the upper part of the spring plug is placed between the two baffles.

4. The self-pre-tightening elastic double-layer wedge gate valve according to claim 3, characterized in that, The movable lock module also includes a support ring. Below the positioning block is a frustum-shaped base. The bottom diameter of the base is larger than the diameter of the opening. The base is made of silicone and has an annular groove at its bottom. The support ring is movably embedded in the annular groove. Both the front and rear sides of the support ring are provided with U-shaped parts II. The U-shaped parts II are slidably connected to the left and right sides of the rib. There are two trapezoidal protrusions. The two trapezoidal protrusions are respectively located at the positions of the gate assembly when the gate valve is in the closed state and the open state. When the gate valve is in the open state, the gate assembly leaves the transverse channel. The ball is squeezed by the trapezoidal protrusion located at the higher position, causing the valve stem and the baffle to disconnect. At the same time, the rib intercepts the support ring, causing the support ring to separate from the base. The valve stem moves further upward, causing the elastic plug to fit against the bottom of the connecting plate.

5. The self-pre-tightening elastic double-layer wedge gate valve according to claim 2, characterized in that, The gate assembly also includes an arc-shaped plate, which is disposed above the positioning block with its convex surface facing upward and is fixedly connected to the valve stem. The baffle plate is provided with a protrusion that can intercept the arc-shaped plate.

6. The self-pre-tightening elastic double-layer wedge gate valve according to claim 4, characterized in that, It also includes a handwheel, which is rotatably located at the top of the longitudinal channel and is threadedly connected to one side of the valve stem. Rotating the handwheel causes the valve stem to rise or fall.

7. The self-pre-tightening elastic double-layer wedge gate valve according to claim 6, characterized in that, The longitudinal channel includes a moving part and a transfer part. The moving part is located above the transfer part. A sealing packing is provided between the moving part and the transfer part. The valve stem passes through the transfer part, the sealing packing and the moving part in sequence and is connected to the handwheel. The transfer part has a cavity inside. The cross-section of the cavity is a trapezoid with a narrow top and a wide bottom. When the gate valve is in the open state, the two cover plates on the gate assembly abut against the side wall of the cavity.

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