High sealability vented butterfly valve and method of use

Abstract

The application relates to a high-sealing-property ventilating butterfly valve and a use method, which comprises a valve body and a butterfly plate shaft, the valve body is internally provided with a valve cavity, the butterfly plate shaft is inserted into the valve body, a butterfly plate is fixedly arranged on the butterfly plate shaft, a sealing seat is circumferentially arranged on the side wall of the valve cavity, the sealing seat is arranged on the motion track of the butterfly plate, the contact surfaces of the sealing seat and the butterfly plate are mutually attached, a sealing element groove is arranged on the side of the sealing seat in contact with the butterfly plate, a first sealing element is arranged in the sealing element groove, one end of the first sealing element is attached to the butterfly plate in a closed state, and the other end is connected with a sealing element extruding device. The application sets the sealing between the butterfly plate and the valve body and the sealing between the butterfly plate shaft and the valve body, reduces the leakage of the butterfly valve, through the arrangement of the sealing element extruding device, the contact between the sealing element and the valve body or the butterfly plate can be more closely, the sealing problems caused by the large manufacturing deviation of the valve body and the butterfly plate, the increase of the gap caused by the deformation in use, the increase of the gap caused by the thermal expansion in use and the non-uniform gap between the valve body and the butterfly plate are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical valves, in particular to a high sealing property ventilation butterfly valve and a use method. BACKGROUND

[0002] The ventilation butterfly valve is a non-closed type butterfly valve (flap valve), which is widely used in the production processes of building materials, metallurgy, mining, power and the like, and is used for connecting, opening and closing or adjusting the medium flow of the pipeline with a nominal pressure of 0.1 Mpa and a medium temperature of ≤300 DEG C. The ventilation butterfly valve is designed and manufactured by adopting a new structure of steel plate and profile steel welding, and has the advantages of compact structure, light weight, easy installation, small flow resistance, large flow capacity, avoidance of the influence of high temperature expansion, and easy operation. The ventilation butterfly valve does not have connecting rods and bolts in the valve body, and has reliable work and long service life.

[0003] The sealing system of the ventilation butterfly valve adopts metal sealing, and the gap between the butterfly plate and the valve body is large, so that there is enough expansion space, which can effectively prevent the thermal expansion and contraction caused by temperature change in the use process. Therefore, the ventilation butterfly valve has a large leakage amount and poor sealing effect. Developing a new sealing structure suitable for the existing structure and use characteristics of the ventilation butterfly valve can widen the use range of the ventilation butterfly valve and reduce the equipment investment. SUMMARY

[0004] The present application provides a high sealing property ventilation butterfly valve and a use method.

[0005] The present application is realized by the following technical scheme, and provides a high sealing property ventilation butterfly valve, which comprises a valve body and a butterfly plate shaft. The valve body is provided with a left-right penetrating valve cavity. The butterfly plate shaft is inserted into the valve body and rotationally connected with the valve body. The butterfly plate shaft is fixedly provided with a butterfly plate. A sealing seat is arranged on the circumferential surface of the valve cavity side wall and located on the movement track of the butterfly plate, so that the contact surfaces of the butterfly plate and the sealing seat are attached to each other when the butterfly valve is in a closed state. A sealing element groove is formed on the side of the sealing seat in contact with the butterfly plate. A first sealing element matched with the sealing element groove is arranged in the sealing element groove. One end of the first sealing element is attached to the butterfly plate in the closed state. The other end of the first sealing element is connected with a sealing element extrusion device.

[0006] In the present application, the sealing seat is arranged on the circumferential surface of the valve cavity side wall and located on the movement track of the butterfly plate, so as to limit the butterfly plate. The sealing element groove is formed on the sealing seat, and the sealing element is filled in the sealing element groove, so as to seal the gap between the butterfly plate and the valve body. The sealing element extrusion device is arranged between the sealing element and the bottom of the sealing element groove, so as to push the sealing element to the butterfly plate, and make the sealing element and the butterfly plate completely attached, thereby ensuring the high sealing property of the butterfly valve.

[0007] As optimization, the side of the butterfly plate edge close to the sealing seat is arranged to be matched with the first sealing element, and the matching surface of the butterfly plate and the first sealing element is a stepped sealing structure. In the scheme, the stepped sealing structure is arranged at the edge of the butterfly plate, the sealing element can be compressed, the contact between the sealing element and the butterfly plate is more close, and the sealing property of the device is improved.

[0008] As optimization, the sealing element extruding device comprises a first spring, one end of the first spring is connected with the end of the first sealing element away from the butterfly plate, and the other end of the first spring is connected with the groove bottom of the sealing element groove. In the scheme, the spring is selected for the sealing element extruding device, one end of the spring is fixed on the groove bottom of the sealing element groove, the other end of the spring is fixed on the sealing element, the sealing element is extruded through the elastic effect of the spring, the sealing element can be matched with the butterfly plate, the sealing property of the butterfly valve is ensured, in addition, the spring type is various, the spring type can be selected according to the needs of different butterfly valves, the assembly is simple, and unnecessary cost can be saved.

[0009] As optimization, a screw is arranged on the groove bottom of the sealing element groove, and the end of the first spring away from the first sealing element is connected with the screw. In the scheme, the screw which can slide along the sealing element groove is arranged on the groove bottom of the sealing element groove, and the screw is connected with the first spring, the elasticity of the first spring can be controlled by adjusting the position of the screw according to the environment needs.

[0010] As optimization, a plurality of long holes are arranged on the first sealing element in the circumferential direction, the long holes are arranged to extend along the axial direction of the first sealing element, a limiting rod extending along the radial direction of the first sealing element is arranged in the long hole, and the limiting rod is fixed on the inner wall of the sealing element groove. In the scheme, the long hole is arranged on the first sealing element, and the limiting rod is arranged in the long hole, the limiting rod plays a limiting role, the sealing element is prevented from being completely separated from the sealing element groove under the elastic force of the spring, the sealing effect is affected, and the long hole extends along the axial direction, so that the sealing element can move in the sealing element groove.

[0011] As optimization, a plurality of limiting rods are arranged on the first sealing element in the circumferential direction, a through hole is arranged on the side wall of the sealing seat away from the valve body, the through hole extends along the axial direction of the first sealing element, and one end of the limiting rod is arranged in the through hole. In the scheme, the limiting rods are arranged on the first sealing element, and the limiting grooves are arranged on the side wall of the sealing seat, so that the limiting rods have a sliding stroke and provide a sliding space for the limiting rods, the sealing element is prevented from being completely separated from the sealing element groove under the elastic force of the spring, and the sealing effect is affected.

[0012] As optimization, the top rod extending out of the sealing piece groove is sleeved with a second spring on the rod body, the second spring can reset the top rod in time, and the sealing piece moves more flexibly.

[0013] As optimization, the top rod extending out of the sealing piece groove is sleeved with a second spring on the rod body, the second spring can reset the top rod in time, and the sealing piece moves more flexibly.

[0014] As optimization, the sealing piece extrusion device comprises a pressing lever, a mounting hole is formed in the side wall of the sealing piece groove away from the valve body, the pressing lever is installed in the mounting hole, and the pressing lever is rotationally connected with the sealing piece groove, one end of the pressing lever extending into the sealing piece groove is in contact with the bottom end of the first sealing piece close to the bottom of the sealing piece groove, and the other end of the pressing lever extending out of the sealing piece groove is in force transmission connection with the butterfly plate. In the scheme, the sealing piece extrusion device is provided as a pressing lever, the butterfly plate is in force transmission connection with the pressing lever, when the butterfly plate is turned to the position, the pressing lever is subjected to the force of the butterfly plate, one end of the pressing lever in the sealing piece groove extrudes the sealing piece, so that the sealing piece is attached to the butterfly plate, the transmission force of the butterfly plate is large, so that the contact between the sealing piece and the butterfly plate is more close, and the sealing is more reliable.

[0015] As optimization, the two ends of the butterfly plate shaft close to the inner wall of the valve body are provided with mounting seats, mounting grooves are formed in the side of the mounting seat close to the valve body, second sealing pieces matched with the mounting grooves are arranged in the mounting grooves, and one end of the second sealing piece close to the valve body is attached to the valve body. In the scheme, the butterfly plate shaft and the valve body are sealed, and the sealing performance of the butterfly valve is ensured.

[0016] As optimization, the second sealing piece is connected with a third spring at the end away from the valve body, and the end of the third spring away from the second sealing piece is fixed to the groove bottom of the mounting groove. In the scheme, the third spring is arranged, the elastic force of the third spring in the mounting groove extrudes the second sealing piece, so that the second sealing piece is more attached to the valve body, and the sealing effect between the butterfly plate shaft and the valve body is ensured.

[0017] As optimization, a gap exists between the side wall of the mounting groove away from the butterfly plate shaft and the valve body, and the second sealing member is provided with a lip at one end close to the valve body, and the lip is filled in the gap. In the scheme, the second sealing member is provided with a lip, and the lip is filled in the gap between the mounting groove and the valve body, so that the sealing effect of the scheme is improved.

[0018] The application also provides a use method of the high-sealing butterfly valve.

[0019] S1, operating the control device outside the valve body to move the butterfly plate to the closed state;

[0020] S2, in the process of moving the butterfly plate close to the sealing seat, the butterfly plate and the valve body adopt at least one of the following sealing structures:

[0021] (1) when the butterfly plate is about to be in place and contacts the sealing seat, the first sealing member is tightly attached to the butterfly plate under the elastic force of the first spring, so as to seal the gap between the butterfly plate and the valve body;

[0022] (2) in the process of moving the butterfly plate close to the sealing seat, the connecting rod on the butterfly plate contacts the top rod, so that the top rod moves in the radial direction and presses the first sealing member, thereby sealing the gap between the first sealing member and the sealing seat;

[0023] (3) in the process of moving the butterfly plate close to the sealing seat, the support rod on the butterfly plate presses down the pressing lever, and further pushes the first sealing member towards the butterfly plate, so that the first sealing member is more tightly attached to the butterfly plate;

[0024] (4) in the process of closing the butterfly plate, the second sealing member installed on the butterfly plate shaft is attached to the valve body under the elastic force of the third spring, so as to seal the gap between the butterfly plate shaft and the valve body.

[0025] S3, operating the control device outside the valve body to move the butterfly plate to the open state;

[0026] S4, the butterfly plate gradually separates from the sealing member pressing device, and the force applied to the sealing member pressing device is stopped until the valve is opened.

[0027] The butterfly valve provided by the application effectively reduces the leakage of the butterfly valve by setting the sealing between the butterfly plate and the valve body and the sealing between the butterfly plate shaft and the valve body. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Structure diagram of the present application;

[0029] Figure 2 Structure diagram of the present application;

[0030] Figure 3 Structure diagram of the present application;

[0031] Figure 4 Structure diagram of the present application;

[0032] Figure 5 Structure diagram of the present application;

[0033] Figure 6 Structure diagram of the present application;

[0034] Structure diagram of the present application;

[0035] 1, valve body, 2, butterfly plate, 3, butterfly plate shaft, 4, sealing seat, 5, sealing piece groove, 6, first sealing piece, 7, first spring, 8, limit rod, 9, top rod, 10, connecting rod, 11, second spring, 12, pressing lever, 13, support rod, 14, mounting seat, 15, mounting groove, 16, second sealing piece, 17, third spring, 18, boss, 19, dustproof ring, 20, stuffing box, 21, packing. DETAILED DESCRIPTION

[0036] To clearly illustrate the technical features of the present application, the following specific embodiments will be described.

[0037] Embodiment 1:

[0038] According to the drawings Figures 1-4 A high-sealing butterfly valve, as shown in the drawings, comprises a valve body 1 and a butterfly plate shaft 3, the valve body 1 is provided with a valve cavity penetrating left and right, the butterfly plate shaft 3 is inserted into the valve body 1 and is rotationally connected with the valve body 1, the butterfly plate shaft 3 is fixedly provided with a butterfly plate 2, the valve cavity side wall is provided with a sealing seat 4 along the circumference, the sealing seat 4 is arranged on the motion track of the butterfly plate 2, and the contact surfaces of the sealing seat 4 and the butterfly plate 2 are mutually fitted, and the fitted surface of the sealing seat 4 and the butterfly plate 2 is provided with a boss 18 to strengthen the sealing.

[0039] In this embodiment, the side of the sealing seat 4 in contact with the butterfly plate 2 is provided with a sealing piece groove 5, the sealing piece groove 5 is provided with a first sealing piece 6 matched with the sealing piece groove 5, and in the closed state, the butterfly plate 2 is fitted with the first sealing piece 6.

[0040] In actual application, the manufacturing deviation between the butterfly plate 2 and the valve body 1 is large, so the gap between the two is large and uneven. To solve the above problems, the first end of the first sealing element 6 away from the butterfly plate 2 is connected with the first spring 7, and the other end of the first spring 7 is fixed to the groove bottom of the sealing element groove 5. The first spring 7 provides elastic force for the first sealing element 6, ensures that the first sealing element 6 is more closely attached to the butterfly plate 5, and ensures the sealing property of the device.

[0041] In the embodiment, the groove bottom of the sealing element groove 5 is provided with a screw for adjusting the spring force, and the first end of the first spring 7 away from the first sealing element is connected with the screw. The screw can slide along the extending direction of the sealing element groove 5. By adjusting the position of the screw, the spring force of the first spring can be adjusted.

[0042] The first sealing element 6 is provided with a plurality of long holes in the circumferential direction, the long holes extend along the axial direction of the first sealing element 6, and a limiting rod 8 extending in the radial direction of the first sealing element 6 is inserted in the long hole. The limiting rod 8 is fixed to the inner wall of the sealing element groove 5. In the embodiment, the limiting rod 8 is a screw. In addition, the limiting rod can also be a hook-shaped rod body, a nail-shaped rod body, etc., which does not affect the use effect of the device.

[0043] The two ends of the butterfly plate shaft 3 close to the inner wall of the valve body 1 are provided with mounting seats 14. The side of the mounting seat 14 close to the valve body 1 is provided with a mounting groove 15, and the second sealing element 16 matched with the mounting groove 15 is arranged in the mounting groove 15. The end of the second sealing element 16 close to the valve body 1 is attached to the valve body 1, and the end of the second sealing element 16 away from the valve body 1 is connected with the third spring 17. The end of the third spring 17 away from the second sealing element 16 is fixed to the groove bottom of the mounting groove 15. There is a gap between the side wall of the mounting groove 15 away from the butterfly plate shaft 3 and the valve body 1. The end of the second sealing element 16 close to the valve body 1 is provided with a lip, and the lip is filled in the gap.

[0044] In the embodiment, there is an interference amount between each side surface of the first sealing element 6 and the sealing element groove 5, which is used for the sealing between the first sealing element 6 and the sealing element groove 5. Similarly, there is also an interference amount between the second sealing element 16 and the two side surfaces of the mounting groove 15, which is used for the sealing between the second sealing element 16 and the two side surfaces of the mounting groove 15. The first sealing element 6 is attached to the mounting seat 14, and the gap between the root of the butterfly plate and the valve body is fully filled.

[0045] The butterfly plate shaft 3 in the embodiment is divided into three parts: a shaft body, a long shaft head and a short shaft head. The long and short shaft heads are coupled with the shaft body by bolts, facilitating the removal of the butterfly plate. The shaft body is made of a steel pipe and is welded with the butterfly plate 2. The long and short shaft heads are fixed on the shaft body by bolts. A stuffing box 20 is arranged between the butterfly plate shaft 3 and the valve body 1. The stuffing box is filled with stuffing 21 to prevent the leakage of the medium in the valve cavity to the outside of the valve cavity. In addition, a dustproof ring 19 is arranged on the butterfly plate shaft to prevent dust, sand and other pollutants from entering the valve cavity.

[0046] The working process of the embodiment is as follows: when the butterfly valve is in a closed state, the butterfly plate 2 rotates along the circumference to the sealing seat 4, is attached to the sealing seat 4, and is in contact with the first sealing element 6 on the sealing seat 4. Under the elastic force of the first spring 7, the first sealing element 6 is attached to the butterfly plate 2, sealing the gap between the butterfly plate 2 and the valve body 1. When the butterfly valve is in an open state, the butterfly plate 2 is flipped away from the sealing seat 4. At this time, the first sealing element 6 slides out of the sealing element groove 5 under the elastic force of the first spring 7 until the limiting rod 8 is in contact with the edge of the long hole of the first sealing element 6. In order to prevent the first spring 7 from ejecting the first sealing element 6 out of the sealing element groove 5 and affecting the sealing effect, the long hole of the first sealing element 6 and the limiting rod 8 inserted in the long hole cooperate with each other to limit the first sealing element 6, controlling the movement range of the first sealing element 6 when moving along the axial direction.

[0047] In addition, for the gap sealing between the butterfly plate shaft 3 and the valve body 1, the embodiment is designed with a mounting groove 15 at both ends of the butterfly plate shaft 3 for mounting the second sealing element 16. The second sealing element 16 is attached to the valve body 1 under the elastic force of the third spring 17, sealing the gap between the butterfly plate shaft 3 and the valve body 1. The second sealing element 16 is designed with a lip to fill the gap between the mounting seat 14 and the valve body 1, enhancing the sealing effect.

[0048] Embodiment 2

[0049] As shown in Figures 1-5 The difference between the embodiment and embodiment 1 is that:

[0050] In the embodiment, a top rod 9 is arranged on the side wall of the sealing element groove away from the valve body. An inner flange is arranged at the end of the top rod 9 extending into the sealing element groove 5. The inner flange is attached to the first sealing element 6. A connecting rod 10 is arranged on the side of the butterfly plate 2 close to the sealing seat 4. The end of the top rod 9 extending out of the sealing element groove 5 is arranged on the movement track of the connecting rod 10. The end surface of the connecting rod 10 in contact with the top rod 9 is designed as an inclined surface. When the butterfly plate is flipped into place, the connecting rod 10 presses the top rod 9, applying pressure to the first sealing element 6 and enhancing the sealing between the first sealing element 6 and the valve body 1.

[0051] An outer flange is provided at one end of the push rod 9 extending outside the sealing groove 5, and a second spring 11 is sleeved on the rod body of the push rod 9 extending outside the sealing groove 5. One end of the second spring 11 is fixed to the outer wall of the sealing groove 5, and the other end of the second spring 11 is fixed to the outer flange.

[0052] In this embodiment, the push rod 9 is an elastic rod, which can avoid excessive squeezing of the sealing member when the butterfly plate 2 is flipped into place and the push rod 9 is pressed.

[0053] The usage of this embodiment:

[0054] S1. Turn the control device outside the valve body to flip the butterfly plate to the closed state;

[0055] S2, the butterfly plate turns over and approaches the sealing seat. Under the elastic force of the first spring, the first seal gradually fits the butterfly plate, gradually eliminating the gap between the butterfly plate and the valve body;

[0056] S3: When the butterfly plate turns over and approaches the sealing seat, the connecting rod on the butterfly plate contacts the push rod, causing the push rod to move radially and squeeze the first sealing member;

[0057] S4. Turn the control device outside the valve body to flip the butterfly plate to the open state;

[0058] S5: When the butterfly plate flips away from the sealing seat, the connecting rod on the butterfly plate leaves the push rod, and the push rod slides radially under the elastic force of the second spring and moves away from the first sealing member;

[0059] S6. During the turning process of the butterfly plate, the second seal installed on the butterfly plate shaft fits against the valve body under the elastic force of the third spring, thereby sealing the gap between the butterfly plate shaft and the valve body.

[0060] Example 3:

[0061] like Figures 1-6 As shown, the difference between this embodiment and embodiments 1 and 2 is that:

[0062] The sealing member extrusion device also includes a clamping lever 12. A mounting hole is provided on the side wall of the sealing member groove 5 away from the valve body 1. The clamping lever 12 is installed in the mounting hole, and the clamping lever 12 is rotatably connected to the sealing member groove 5. One end of the clamping lever 12 extending into the sealing member groove 5 contacts the end of the first sealing member 6 close to the bottom of the sealing member groove 5. The end of the clamping lever 12 extending outside the sealing member groove 5 is connected to a support rod 13. The butterfly plate 2 is connected to the clamping lever 12 through the support rod 13 to transmit force.

[0063] In this embodiment, the pressing lever 12 is an elastic rod to avoid excessive squeezing of the first sealing member 6 .

[0064] In the embodiment, the support rod 13 is extruded in the process of the butterfly plate 2 being turned to the closed state, the support rod 13 drives the pressing lever 12 to operate, and the first sealing element 6 is extruded. Because the transmission force of the butterfly plate 2 is large, the contact between the first sealing element 6 and the butterfly plate 2 is more compact, and the sealing is more reliable.

[0065] The above description is not only applicable to the circular and square butterfly valves, but also applicable to the multi-leaf valve, the double-leaf butterfly valve, and the flue butterfly valve. The technical features not described in the application can be realized by or using the prior art, and will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the application and are not a limitation of the application. The application is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the application do not deviate from the purpose of the application, and should also belong to the protection scope of the claims of the application.

Claims

1. A high-sealing butterfly valve, comprising a valve body (1) and a butterfly plate shaft (3), a valve cavity is arranged in the valve body (1) and penetrates left and right, the butterfly plate shaft (3) is inserted into the valve body (1) and is rotationally connected with the valve body (1), and a butterfly plate (2) is fixed on the butterfly plate shaft (3), characterized in that: The valve cavity side wall is provided with a sealing seat (4) in the circumferential direction, the sealing seat (4) is arranged on the motion track of the butterfly plate (2), when the butterfly plate (2) is in the closed state, the sealing seat (4) and the contact surface of the butterfly plate (2) are mutually fitted, the side of the sealing seat (4) in contact with the butterfly plate (2) is provided with a sealing element groove (5), the sealing element groove (5) is provided with a first sealing element (6) matched with the sealing element groove (5), one end of the first sealing element (6) is arranged in close contact with the butterfly plate (2) in the closed state, and the other end of the first sealing element (6) is connected with a sealing element extrusion device. ​ The side of the butterfly plate (2) edge close to the sealing seat (4) is arranged in close contact with the first sealing element (6), and the contact surface of the butterfly plate (2) and the first sealing element (6) is a stepped sealing structure. The side wall of the sealing element groove (5) away from the valve body (1) is provided with a ejector rod (9), one end of the ejector rod (9) extending into the sealing element groove (5) is in contact with the first sealing element (6), the side of the butterfly plate (2) close to the sealing seat (4) is provided with a connecting rod (10), and one end of the ejector rod (9) extending out of the sealing element groove (5) is arranged on the motion track of the connecting rod (10) and is in force transmission connection with the connecting rod (10).

2. The high containment vented butterfly valve of claim 1, wherein: The sealing element extrusion device comprises a first spring (7), one end of the first spring (7) is connected with one end of the first sealing element (6) away from the butterfly plate (2), and the other end of the first spring (7) is connected with the groove bottom of the sealing element groove (5).

3. The high containment vented butterfly valve of claim 1, wherein: One end of the ejector rod (9) extending out of the sealing element groove (5) is provided with an outer flange, a second spring (11) is sleeved on the rod body of the ejector rod (9) extending out of the sealing element groove (5), one end of the second spring (11) is fixedly connected to the outer wall of the sealing element groove (5), and the other end of the second spring (11) is fixedly connected with the outer flange.

4. The high containment vented butterfly valve of claim 2, wherein: Both ends of the butterfly plate shaft (3) close to the inner wall of the valve body (1) are provided with mounting seats (14), the side of the mounting seat (14) close to the valve body (1) is provided with a mounting groove (15), the mounting groove (15) is provided with a second sealing element (16) matched with the mounting groove (15), and one end of the second sealing element (16) close to the valve body (1) is arranged in close contact with the valve body (1).

5. The high containment vented butterfly valve of claim 4, wherein: One end of the second sealing element (16) away from the valve body (1) is connected with a third spring (17), and the other end of the third spring (17) away from the second sealing element (16) is connected with the groove bottom of the mounting groove (15).

6. The high containment vented butterfly valve of claim 5, wherein: One end of the second sealing element (16) close to the valve body (1) is provided with a lip, and the lip is filled in the gap between the side wall of the mounting groove (15) away from the butterfly plate shaft (3) and the valve body (1).

7. A method of using the high containment butterfly valve of claim 5, wherein, The method comprises the following steps: S1, operating the control device outside the valve body to make the butterfly plate move to the closed state; S2, during the process that the butterfly plate moves close to the sealing seat, the butterfly plate and the valve body adopt at least one of the following sealing structures: (1) the butterfly plate is about to be in place and contacts the sealing seat, under the elastic force of the first spring, the first sealing element is closely fitted with the butterfly plate, and the gap between the butterfly plate and the valve body is sealed; (2) In the process of moving the butterfly plate close to the sealing seat, the connecting rod on the butterfly plate contacts the ejector rod, which moves along the radial direction, extruding the first sealing element to seal the gap between the first sealing element and the sealing seat; (3) In the process of closing the butterfly plate, the second sealing element installed on the butterfly plate shaft adheres to the valve body under the elastic force of the third spring, sealing the gap between the butterfly plate shaft and the valve body; S3, operating the control device outside the valve body to move the butterfly plate to the open state; S4, the butterfly plate gradually separates from the sealing element extrusion device, and the force applied to the sealing element extrusion device is stopped until the valve is opened.

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