Elastomeric flange gate valve

Abstract

The utility model relates to a kind of elastic gate flange gate valves in flange gate valve field, including valve cover and valve body, the inside of valve body is provided with valve cavity, the inside of valve body is formed with the flow channel of guide, valve rod is connected on valve cover, the end of valve rod is connected with gate, the inside of valve cavity is equipped with two valve seats, the middle part of valve seat is provided with through hole, accommodating groove is provided in the side of gate close to valve seat, and the matching sealing seat of telescopic is equipped in accommodating groove, and reset elastic member is arranged between accommodating groove and sealing seat, reset elastic member can provide the elastic force of continuously approaching valve seat to sealing seat, guiding rod is connected in accommodating groove, guiding hole is provided on sealing seat, the end of guiding rod is connected with limiting nut, the utility model is driven by valve rod, and gate drives sealing seat to move close to or away from valve seat, so that the end surface of gate and the end surface of valve seat contact, and sealing seat is driven to move to through hole by the elastic force of reset elastic member and is tensioned sealing, improve sealing reliability and stability.

Description

Technical Field

[0001] This utility model relates to the field of flange gate valves, specifically to a resilient gate flange gate valve. Background Technology

[0002] Flanged gate valves are widely used fluid shut-off devices in industrial pipeline systems, belonging to the fields of valve manufacturing and fluid control technology. These valves achieve reliable sealing with the pipeline through flange connections and are widely used in fluid transport pipelines, performing the function of cutting off the medium in the open / closed state. Due to their characteristics of low flow resistance and good channel straightness during opening and closing, they hold an irreplaceable technical position in scenarios requiring low flow resistance and high sealing reliability.

[0003] Existing flanged gate valves typically include the following core components: the valve body, as the main structure, connects to the pipeline through the flange end face; the valve cover, which mates with the valve body to form a sealed cavity to accommodate internal moving parts; the gate, as the opening and closing element, comes in two types: wedge type or parallel type, and achieves shut-off by fitting against the valve seat sealing surface; the valve stem comes in two types: rising stem and non-rising stem, which transmits operating torque to drive the gate to rise and fall; the sealing elements include the valve seat sealing surface (often using hard metal seals such as Stellite alloy weld overlay, or soft seals such as rubber coating) and the stuffing box seal; the operating mechanism is configured with handwheels, electric actuators, or pneumatic actuators, etc., depending on the requirements.

[0004] However, existing flange gate valves still have certain technical defects in practical applications. One such defect is the susceptibility of the sealing surfaces between the wedge gate and the valve seat to wear. During the opening and closing of the gate, the metal gate and the valve seat sealing surfaces experience high-frequency, high-pressure frictional contact, leading to wear that affects sealing stability. This wear gradually destroys the original precision of the sealing surface, causing a decrease in sealing specific pressure, the formation of leakage channels, and ultimately valve seal failure. Furthermore, the traditional rigid contact between the gate and valve seat makes it difficult to ensure a reliable seal during long-term operation, affecting service life and increasing maintenance costs. Therefore, there is an urgent need for a resilient flange gate valve with compensable sealing. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned defects and provide a flexible gate flange valve to solve the technical problem in the background art of how to improve the sealing performance between the wedge gate and the valve seat, thereby enhancing the service life and sealing stability.

[0006] The objective of this utility model is achieved through the following means:

[0007] A resilient gate flange valve includes a valve cover and a valve body. The valve body has an internal valve cavity, with an inlet and an outlet at both ends communicating with the valve cavity, creating a flow channel within the valve body. A valve stem is connected to the valve cover, with one end passing through the valve cover and extending into the valve cavity. A gate for cutting off the flow channel is connected to the end of the valve stem near the valve cavity. A handwheel is connected to the end of the valve stem. Two symmetrically distributed valve seats are located inside the valve cavity, each with a through hole communicating with the flow channel in its center. The gate is inverted conical, with the end face between the two valve seats forming a matching conical surface. The gate is positioned between the two valve seats and can rise or fall relative to the valve seats by rotating the valve stem, causing the two sides of the gate to contact the two valve seats. A seal is formed in the through hole. A receiving groove is opened on the side of the gate near the valve seat. A telescopic sealing seat is matched in the receiving groove. A reset elastic element for tightening the seal is provided between the receiving groove and the sealing seat. The reset elastic element can provide a continuous elastic force to the sealing seat to move closer to the valve seat. A guide rod is connected in the receiving groove. A guide hole for the guide rod to pass through is opened on the sealing seat. The axial direction of the guide rod extends flush with the flow channel. A limit nut is connected to the end of the guide rod that passes through the sealing seat and is away from the receiving groove. The limit nut can limit the extension position of the sealing seat. The gate can be driven by the valve stem to move the sealing seat closer to or away from the valve seat, so that the end face of the gate contacts the end face of the valve seat to seal. The elastic force of the reset elastic element drives the sealing seat to extend into the through hole of the valve seat for tightening and sealing.

[0008] Furthermore, as described above, the two valve seats are respectively disposed between the valve cavity and the inlet and outlet, and the two valve seats are integrally formed with the valve body.

[0009] Furthermore, as described above, the receiving groove is provided with a connecting hole for mating and installing guide rods, so that one end of the guide rod is connected to the connecting hole by a thread, and the other end of the guide rod forms a limit end, which is connected to a limit nut by a thread.

[0010] The guide rod achieves an adjustable limit function through a threaded connection. Together with the limit nut, it controls the extension position of the sealing seat, preventing the sealing seat from detaching and ensuring the seal between the sealing seat and the valve seat through hole. The guide hole and guide rod design ensure that the sealing seat maintains a stable movement trajectory during opening and closing.

[0011] Furthermore, as described above, the sealing seat has an internal clearance groove for accommodating the limiting nut, and a sealing end is formed at the end of the sealing seat near the valve seat. An inclined sealing surface is formed on the outer side of the sealing end, and a wedge-tightening surface is provided on the inner wall of the through hole for sealing contact with the sealing surface.

[0012] The inclined sealing surface of the sealing seat and the wedge-shaped sealing surface of the inner wall of the through hole form a wedge-shaped sealing structure. Under the elastic force of the reset elastic element, a self-sealing effect can be generated. The reset elastic element can continuously apply the elastic force extending along the receiving groove to the sealing seat, so that it can seal tightly with the valve seat. At the same time, the inclined surface design reduces the sliding friction with the valve seat during opening and closing, and reduces the wear rate.

[0013] Specifically, during the descent of the gate, the valve seat squeezes the sealing seat, causing the sealing seat to overcome the elastic force of the reset elastic element and contract into the receiving groove. When the gate moves to the set sealing position, the sealing seat loses the squeeze of the valve seat, and the sealing end of the sealing seat extends into the through hole of the valve seat under the elastic force of the reset elastic element, so that the sealing surface and the wedge sealing surface can be wedge-tightened and sealed.

[0014] Furthermore, as described above, the receiving groove is provided with a plurality of circumferentially arrayed mounting holes, and the side of the sealing seat near the receiving groove has a plurality of positioning holes that are matched with the mounting holes. One end of the reset elastic element passes through the mounting hole, and the other end of the reset elastic element passes through the positioning hole.

[0015] Multiple circumferentially distributed mounting holes and positioning holes ensure that the reset elastic element is evenly arranged, ensuring that the sealing seat is subjected to balanced forces in all directions. When the sealing surface experiences slight wear, the elastic element can continuously provide axial compensation force to maintain tight contact between the sealing seat and the valve seat, avoid the formation of leakage channels due to local wear, and extend the sealing failure cycle.

[0016] Furthermore, as described above, the reset elastic element is composed of a spring.

[0017] The linear elasticity of the spring provides a stable and continuous preload, maintaining the sealing seat pressed against the valve seat during repeated opening and closing of the valve. This effectively compensates for the loss of sealing surface material caused by high-frequency friction, further enhancing the sealing performance of traditional rigid sealing structures.

[0018] Furthermore, as described above, the gate plate is connected to one end of the valve stem via a connecting block, a guide nut is provided on the valve cover, and a threaded portion matching the guide nut is provided at the end of the valve stem near the handwheel.

[0019] The precise fit between the guide nut and the valve stem thread enables accurate control of the gate's lifting and lowering, ensuring stable movement of the sealing seat during opening and closing, avoiding impact damage to the sealing surface caused by fluctuations in operating force, and enhancing operational stability and sealing reliability.

[0020] Furthermore, as described above, there are two sealing seats, which are symmetrically distributed on both sides of the gate plate, and there are two or more guide rods, with the diameter of the guide rods being smaller than the inner diameter of the guide hole.

[0021] By using two symmetrically distributed sealing seats with through holes for two valve seats, the reliability and stability of the seal are further enhanced, preventing leakage due to uneven wear of the sealing seat on one side; multiple guide rods form a multi-point guiding structure to ensure the stability of the sealing seat in use.

[0022] Furthermore, as described above, the sealing seat is made of rubber.

[0023] The high elasticity and wear resistance of rubber material allow it to adapt to changes in the shape of the valve seat orifice under pressure, forming a gap seal. At the same time, the coefficient of friction of rubber is lower than that of metal, reducing frictional losses during opening and closing. Furthermore, the connection between the sealing seat and the guide rod and the limit nut allows for disassembly and assembly, enabling the replacement of the corresponding sealing seat according to the wear condition.

[0024] The beneficial effects of this utility model are as follows: During the opening and closing of the gate by rotating the valve stem, the sealing seat contracts into the receiving groove when squeezed by the valve seat. When the gate reaches the sealing position between the two valve seats, the sealing seat extends into the valve seat through hole under the action of the reset elastic element to form a wedge seal. At the same time, the axial constraint of the guide rod and the limit nut ensures that the extension and retraction direction of the sealing seat is flush with the flow channel and prevents the sealing seat from directly detaching. Through the synergistic action of the retractable sealing seat in the receiving groove and the reset elastic element, when the gate seals, the reset elastic element continuously applies a spring force close to the valve seat to the sealing seat, so that the end face of the sealing seat and the valve seat through hole form a close seal. The spring force of the reset elastic element can drive the sealing seat to automatically compensate for the wear gap, so that the end face of the sealing seat is always driven by the spring force to keep it in close contact with the valve seat through hole, forming a reliable wedge seal effect, thereby further enhancing the sealing reliability and stability between the gate and the valve seat, effectively extending the service life of the valve and reducing maintenance costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure in the first direction of this embodiment;

[0026] Figure 2 This is a schematic diagram of the overall structure in the second direction of this embodiment;

[0027] Figure 3 This is a cross-sectional view of this embodiment;

[0028] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0029] Figure 5 This is a schematic diagram of the flow channel opening state when the gate rises in this embodiment;

[0030] Figure 6 This is a structural breakdown diagram of this embodiment;

[0031] Figure 7for Figure 6 A magnified view of part B in the diagram;

[0032] The reference numerals in the figure are as follows:

[0033] 100-Valve Cover;

[0034] 200-Valve body, 201-Valve cavity, 202-Inlet, 203-Outlet;

[0035] 300 - Valve stem, 301 - Threaded part;

[0036] 400-gate, 401-receiving groove, 402-connecting hole, 403-mounting hole, 404-connecting block;

[0037] 500 - Valve seat, 501 - Through hole, 502 - Wedge face;

[0038] 600-Sealing seat, 601-Allowing groove, 602-Sealing end, 603-Sealing surface, 604-Positioning hole, 605-Guide hole;

[0039] 700-Guide rod, 701-Threaded end, 702-Limit end, 800-Guide nut, 900-Limit nut, 1000-Reset elastic element. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0041] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following describes the solution in further detail with reference to the accompanying drawings and embodiments.

[0042] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] In this embodiment, refer to Figures 1-7The specific implementation of a resilient gate valve 400 flange includes a valve cover 100 and a valve body 200. The valve body 200 has a valve cavity 201 inside, and its two ends are provided with an inlet 202 and an outlet 203 communicating with the valve cavity 201, forming a flow channel inside the valve body 200. A valve stem 300 is connected to the valve cover 100. One end of the valve stem 300 passes through the valve cover 100 and extends into the valve cavity 201 of the valve body 200. The end of the valve stem 300 near the valve cavity 201 is connected to a device for cutting off the flow channel. The gate 400 has a handwheel connected to the end of the valve stem 300. The valve cavity 201 contains two symmetrically distributed valve seats 500. Each valve seat 500 has a through hole 501 in the middle that communicates with the flow channel. The gate 400 is inverted conical in shape, and the end faces between the two valve seats 500 form conical surfaces that match the gate 400. The gate 400 is positioned between the two valve seats 500, and its movement relative to the valve seats 500 is controlled by rotating the valve stem 300, allowing the gate 400 to rise or fall relative to the valve seats 500 on both sides. The gate 400 forms a seal with the through hole 501. A receiving groove 401 is provided on the side of the gate 400 near the valve seat 500. A retractable sealing seat 600 is paired within the receiving groove 401, and a reset elastic element 1000 for tightening the seal is provided between the receiving groove 401 and the sealing seat 600. The reset elastic element 1000 provides a continuous elastic force to the sealing seat 600, bringing it closer to the valve seat 500. A guide rod 700 is connected within the receiving groove 401, and a guide hole 605 is provided on the sealing seat 600 for the guide rod 700 to pass through. The axial direction of 0 extends flush with the flow channel, and the guide rod 700 passes through the sealing seat 600 and is connected to the end away from the receiving groove 401 by a limiting nut 900, so that the limiting nut 900 can restrict the extension position of the sealing seat 600. The valve stem 300 can drive the gate 400 to move the sealing seat 600 closer to or away from the valve seat 500, so that the end face of the gate 400 contacts and seals with the end face of the valve seat 500. The elastic force of the reset elastic element 1000 drives the sealing seat 600 to extend into the through hole 501 of the valve seat 500 for tightening and sealing.

[0044] The valve body 200 has flanges at both ends for docking.

[0045] The two valve seats 500 are respectively disposed between the valve cavity 201 and the inlet 202 and outlet 203, and the two valve seats 500 are integrally formed with the valve body 200. The valve cavity 201 is provided with a vertically extending guide protrusion, and the side of the gate 400 is formed with a guide groove. The guide groove and the guide protrusion are matched to ensure the stability of the gate 400 during lifting and lowering.

[0046] The receiving groove 401 is provided with a connecting hole 402 for pairing and installing guide rods 700, so that one end of the guide rod 700 is connected to the connecting hole 402 through a threaded end 701, and the other end of the guide rod 700 forms a limiting end 702, which is connected to a limiting nut 900 through a thread.

[0047] The guide rod 700 forms an adjustable limit through a threaded connection. It works with the limit nut 900 to control the extension position of the sealing seat 600, preventing the sealing seat 600 from detaching. At the same time, it ensures the seal between the sealing seat 600 and the through hole 501 of the valve seat 500. The guide hole 605 and the guide rod 700 ensure that the sealing seat 600 maintains a stable movement trajectory during opening and closing.

[0048] The sealing seat 600 has an internal clearance groove 601 for accommodating the limiting nut 900, and a sealing end 602 is formed at the end of the sealing seat 600 near the valve seat 500. An inclined sealing surface 603 is formed on the outer side of the sealing end 602, and a wedge-tightening surface 502 is provided on the inner wall of the through hole 501 for sealing contact with the sealing surface 603.

[0049] The inclined sealing surface 603 of the sealing seat 600 and the wedge-tightening surface 502 of the inner wall of the through hole 501 form a wedge-shaped sealing structure. Under the elastic force of the reset elastic element 1000, a self-sealing effect can be generated. The reset elastic element 1000 can continuously apply the elastic force extending along the receiving groove 401 to the sealing seat 600, so that it can seal tightly with the valve seat 500. At the same time, the inclined surface design reduces the sliding friction with the valve seat 500 during opening and closing, and reduces the wear rate.

[0050] Specifically, during the descent of the gate 400, the valve seat 500 presses against the sealing seat 600, causing the sealing seat 600 to overcome the elastic force of the reset elastic element 1000 and retract into the receiving groove 401. When the gate 400 moves to the set sealing position, the sealing seat 600 loses the pressure of the valve seat 500, and the sealing end 602 of the sealing seat 600 extends into the through hole 501 of the valve seat 500 under the action of the elastic force of the reset elastic element 1000, so that the sealing surface 603 and the wedge-tightening surface 502 can be wedge-tightened and sealed.

[0051] The receiving groove 401 is provided with a plurality of circumferentially arrayed mounting holes 403. The sealing seat 600 has a plurality of positioning holes 604 on the side near the receiving groove 401 that are matched with the mounting holes 403. One end of the reset elastic member 1000 passes through the mounting hole 403, and the other end of the reset elastic member 1000 passes through the positioning hole 604.

[0052] Multiple circumferentially distributed mounting holes 403 and positioning holes 604 ensure that the reset elastic element 1000 is evenly arranged, ensuring that the sealing seat 600 is subjected to balanced force in all directions. When the sealing surface 603 experiences slight wear, the elastic element can continuously provide axial compensation force to maintain the tight contact between the sealing seat 600 and the valve seat 500, avoid the formation of leakage channels due to local wear, and extend the sealing failure cycle.

[0053] The reset elastic element 1000 is composed of springs. Each sealing seat 600 is connected to 8 springs. The linear elastic characteristics of the springs can provide a stable and continuous preload force, ensuring that the sealing seat 600 is always pressed against the valve seat 500 during multiple opening and closing of the valve. This effectively compensates for the material loss of the sealing surface 603 caused by high-frequency friction, and further enhances the sealing performance of the traditional rigid sealing structure.

[0054] The gate plate 400 is connected to one end of the valve stem 300 via a connecting block 404. A guide nut 800 is provided on the valve cover 100. The end of the valve stem 300 near the handwheel is provided with a threaded part 301 that matches the guide nut 800.

[0055] The precise fit between the guide nut 800 and the threaded portion 301 of the valve stem 300 enables precise control of the lifting and lowering of the gate 400, ensuring the stable movement of the sealing seat 600 during the opening and closing process, avoiding impact damage to the sealing surface 603 caused by fluctuations in operating force, and enhancing operational stability and sealing reliability.

[0056] Two sealing seats 600 are provided, and the two sealing seats 600 are symmetrically distributed on both sides of the gate plate 400. Two or more guide rods 700 are provided, and the diameter of the guide rod 700 is smaller than the inner diameter of the guide hole 605.

[0057] The two symmetrically distributed sealing seats 600 are matched with the through holes 501 of the two valve seats 500, which further enhances the reliability and stability of the seal and prevents leakage due to uneven wear of the sealing seat 600 on one side; multiple guide rods 700 form a multi-point guiding structure to ensure the stability of the sealing seat 600 in use.

[0058] In some embodiments, when the sealing end 602 of the sealing seat 600 is severely worn, the sealing seat 600 can be replaced by removing the valve cover 100, taking out the gate 400 and the valve stem 300, and removing the limit nut 900.

[0059] The sealing seat 600 is made of rubber. The high elasticity and wear resistance of the rubber material allow it to adapt to the shape changes of the through hole 501 of the valve seat 500 when subjected to pressure, forming a gap seal. At the same time, the coefficient of friction of rubber is lower than that of metal, reducing frictional loss during the opening and closing process. Furthermore, the sealing seat 600 is detachable and can be installed and removed through the connection between the guide rod 700 and the limit nut 900, so that the corresponding sealing seat 600 can be replaced according to the wear condition.

[0060] The specific installation structure of this embodiment is as follows: The gate plate 400 is connected to the end of the valve stem 300 through the connecting block 404, so that the valve stem 300 passes through the guide nut 800 through the threaded part 301 and is paired. The end of the valve stem 300 away from the gate plate 400 is connected to a handwheel. By manually rotating the handwheel, the valve stem 300 can drive the gate plate 400 to move up and down along the guide protrusion through the threaded part 301. The guide rod 700 is connected to the connecting hole 402 in the receiving groove 401, so that one end of the reset elastic element 1000 is connected to the mounting hole 403. The sealing seat 600 passes through the guide hole 602. 05 is paired with guide rod 700 and connected to the end of guide rod 700 through limit nut 900 to form a limit, so as to prevent the sealing seat 600 from detaching. The reset elastic element 1000 is set between receiving groove 401 and sealing seat 600. Through the elastic force of reset elastic element 1000, the sealing seat 600 can be driven to continuously move away from gate plate 400 along receiving groove 401. Specifically, two sealing seats 600 are provided, and the two sealing seats 600 are respectively installed in receiving groove 401 on both sides of gate plate 400 through guide rod 700, limit nut 900 and reset elastic element 1000.

[0061] The specific operating principle in this embodiment is as follows:

[0062] Reference Figure 3 and Figure 4During the process of the valve stem 300 rotating to lower the gate 400 and cut off the flow channel, the tapered gate 400 moves closer to the valve seat 500, causing the sealing seats 600 on both sides of the gate 400 to be squeezed by the valve seat 500, thereby compressing the reset elastic element 1000 and contracting it into the receiving groove 401. When the gate 400 reaches the sealing position between the two valve seats 500, the sealing seat 600 extends into the through hole 501 of the valve seat 500 under the action of the reset elastic element 1000. At this time, the sealing end 602 forms a wedge seal on the inner wall of the through hole 501 under the elastic force of the reset elastic element 1000. At the same time, the axial constraint of the guide rod 700 and the limit nut 900 ensures that the extension and retraction direction of the sealing seat 600 is flush with the flow channel and prevents... The direct disengagement of the sealing seat 600, through the synergistic action of the retractable sealing seat 600 within the receiving groove 401 and the reset elastic element 1000, ensures that when the gate 400 is sealing, the reset elastic element 1000 continuously applies a spring force close to the valve seat 500 to the sealing seat 600, causing the end face of the sealing seat 600 to form a tight seal with the through hole 501 of the valve seat 500. The spring force of the reset elastic element 1000 can drive the sealing seat 600 to automatically compensate for wear gaps, ensuring that the end face of the sealing seat 600 is always driven by the spring force to maintain a tight fit with the through hole 501 of the valve seat 500, forming a reliable wedge-tight sealing effect. This further enhances the sealing reliability and stability between the gate 400 and the valve seat 500, effectively extending the valve's service life and reducing maintenance costs.

[0063] Reference Figure 5 When the valve stem 300 rotates to raise the gate 400 and open the flow channel, the inclined sealing surface 603 of the sealing seat 600 ensures that it is disengaged from the wedge-tightening surface 502. When the gate 400 drives the sealing seat 600 to rise, it is squeezed by the valve seat 500, which causes the sealing seat 600 to drive the reset elastic element 1000 to compress, thereby ensuring that the sealing end 602 of the sealing seat 600 can be disengaged from the through hole 501 and continue to rise until the through holes 501 of the two valve seats 500 are connected and opened, so that the flange gate valve is in the open state, while the sealing seat 600 is ready for sealing pairing when the flow channel is closed next time.

[0064] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A resilient gate flange valve, comprising a valve cover and a valve body, wherein a valve cavity is formed inside the valve body, and an inlet and an outlet communicating with the valve cavity are provided at both ends of the valve body, thereby forming a flow channel inside the valve body; a valve stem is connected to the valve cover, one end of the valve stem passes through the valve cover and extends into the valve cavity of the valve body, and a gate for cutting off the flow channel is connected to the end of the valve stem near the valve cavity; a handwheel is connected to the end of the valve stem, characterized in that: The valve cavity contains two symmetrically distributed valve seats, each with a through hole in the center communicating with the flow channel. The gate is inverted conical in shape, with the end faces of the two valve seats forming a matching conical surface. The gate is positioned between the two valve seats and can rise or fall relative to the valve seats by rotating the valve stem, causing the two sides of the gate to contact the two valve seats and seal the through hole. A receiving groove is provided on the side of the gate near the valve seats, within which a retractable sealing seat is paired. A reset elastic element for tightening the seal is provided between the receiving groove and the sealing seat. The reset elastic element provides a continuous elastic force to the sealing seat, bringing it closer to the valve seat. A guide rod is connected inside the receiving groove. The sealing seat has a guide hole for the guide rod to pass through. The guide rod extends axially along the flow channel and is connected to a limit nut at the end of the guide rod that passes through the sealing seat and is away from the receiving groove. The limit nut restricts the extension position of the sealing seat. The valve stem drives the gate to move the sealing seat closer to or away from the valve seat, so that the end face of the gate contacts and seals with the end face of the valve seat. The elastic force of the reset elastic element drives the sealing seat to move towards the through hole of the valve seat for tightening and sealing.

2. The resilient gate flange valve according to claim 1, characterized in that: The two valve seats are respectively disposed between the valve cavity and the inlet and outlet, and the two valve seats are integrally formed with the valve body.

3. The resilient gate flange valve according to claim 1, characterized in that: The receiving groove is provided with a connecting hole for matching and installing guide rods, so that one end of the guide rod is connected to the connecting hole by a thread, and the other end of the guide rod forms a limit end, which is connected to a limit nut by a thread.

4. The resilient gate flange valve according to claim 1, characterized in that: The sealing seat has an internal clearance groove for accommodating the limiting nut, and a sealing end is formed at the end of the sealing seat near the valve seat. An inclined sealing surface is formed on the outer side of the sealing end, and a wedge-tightening surface is provided on the inner wall of the through hole for sealing contact with the sealing surface.

5. The resilient gate flange valve according to claim 1, characterized in that: The receiving groove is provided with a plurality of circumferentially arrayed mounting holes. The side of the sealing seat near the receiving groove has a plurality of positioning holes that are matched with the mounting holes. One end of the reset elastic element passes through the mounting hole, and the other end of the reset elastic element passes through the positioning hole.

6. The resilient gate flange valve according to claim 5, characterized in that: The reset elastic element is composed of a spring.

7. A resilient gate flange valve according to any one of claims 1-6, characterized in that: The gate plate is connected to one end of the valve stem via a connecting block. A guide nut is provided on the valve cover, and the end of the valve stem near the handwheel has a threaded part that matches the guide nut.

8. A resilient gate flange valve according to any one of claims 1-6, characterized in that: Two sealing seats are provided, and the two sealing seats are symmetrically distributed on both sides of the gate. There are two or more guide rods, and the diameter of the guide rod is smaller than the inner diameter of the guide hole.

9. A resilient gate flange valve according to any one of claims 1-6, characterized in that: The sealing seat is made of rubber.

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