Valve seat sealing structure of polyethylene blow-off ball valve

Abstract

The utility model discloses a valve seat sealing structure of a polyethylene blow-off ball valve, which comprises a valve body, two valve seat pockets, a valve cover and a sealing ring. The ball body is rotationally arranged in the valve body and located between the two valve seat pockets; the number of the valve seat bodies is two, and the two valve seat bodies are symmetrically arranged in the two valve seat pockets; the sealing contact surface is arranged on the valve seat body, and the sealing contact surface of the valve seat body is connected with the ball body in a sealing manner; the channel is formed in the surface of the sealing contact surface, and the channel is arranged in a concave mode; the channel is arranged on the sealing contact surface of the valve seat body, so that if the ball body deviates towards the outlet of the valve body due to pressure, a certain gap is formed between the valve seat body at the inlet of the valve body and the ball body, and when impurity particles enter the gap, the impurity particles are prevented from being accumulated on the sealing contact surface of the valve seat body; and the service life is influenced by abrasion between a sealing contact surface and the ball body.

Description

Technical Field

[0001] The utility model belongs to the technical field of polyethylene blow-off ball valves, and particularly relates to a seat sealing structure of a polyethylene blow-off ball valve. Background Technique

[0002] A polyethylene blow-off ball valve (PE blow-off ball valve) is a ball valve made of polyethylene (PE) material and is used to control and discharge gas or liquid media. Due to the characteristics of its material, the polyethylene blow-off ball valve is mainly used for handling highly corrosive media or applications in environments where corrosion resistance is required. "Blow-off" usually refers to safely releasing the pressure or medium in the system into the environment. In a polyethylene blow-off ball valve, the blow-off function can help maintain the system pressure, avoid excessive pressure accumulation, and ensure safe operation.

[0003] In a polyethylene blow-off ball valve, there are floating ball valves and fixed ball valves. The floating ball valve specifically refers to a design in which the ball can float inside the valve to provide better sealing performance.

[0004] The valve seat usually has a smooth sealing surface in contact with the ball. During the fluid transmission process, sometimes the pressure forces the ball to shift towards the outlet of the valve body. At this time, the valve seat at the inlet of the valve body may lose the sealed connection with the ball, creating a certain gap. And there are usually some impurity particles in the fluid. When the impurity particles enter the gap, they are not easy to discharge, which will accelerate the wear of the valve seat and result in a short service life. Summary of the Invention

[0005] To solve the above technical problems, the utility model provides the following technical solutions. A seat sealing structure of a polyethylene blow-off ball valve, characterized in that it further includes:

[0006] A valve body, which is internally provided with two seat pockets;

[0007] A ball, which is rotatably arranged in the valve body and is located between the two seat pockets;

[0008] Two valve seat bodies, which are symmetrically arranged in the two seat pockets;

[0009] A sealing contact surface, the valve seat body is provided with a sealing contact surface, and the sealing contact surface of the valve seat body is in sealed connection with the ball;

[0010] A channel, which is arranged on the surface of the sealing contact surface, and the channel is arranged in a concave shape;

[0011] A positioning component, which positions the valve seat body during installation through the positioning component.

[0012] Furthermore, the valve seat body includes:

[0013] The first protruding ring, which has semi-circular protrusions;

[0014] The second protruding ring, which has two, and both of the two second protruding rings have semi-circular protrusions, and the protrusions of the first protruding ring are larger than those of the second protruding ring;

[0015] Wherein, both the first protruding ring and the second protruding ring are located on the sealing contact surface, and the first protruding ring is located between the two second protruding rings.

[0016] Furthermore, the valve seat body includes:

[0017] The first contact surface, which is provided on the valve seat body;

[0018] The second contact surface, which is also provided on the valve seat body;

[0019] Wherein, the first contact surface and the second contact surface are used to contact the valve seat pocket, an obtuse angle is formed between the first contact surface and the second contact surface, and an acute angle is formed between both the first contact surface and the second contact surface and the contact surface of the valve seat pocket.

[0020] Furthermore, the valve seat body is made of thermoplastic plastic.

[0021] Furthermore, the positioning assembly includes:

[0022] The positioning ring, which is fixedly arranged in the valve seat pocket;

[0023] The ring groove, which is formed on the valve seat body.

[0024] Furthermore, the cross-section of the positioning ring is in the shape of a water droplet, and the cross-sectional contour of the ring groove is the same as that of the positioning ring.

[0025] Furthermore, it further includes:

[0026] The contact angle, which is formed by the intersection of the first contact surface and the second contact surface, and the contact angle is a rounded angle.

[0027] Furthermore, it further includes:

[0028] The installation angle, which is formed by the intersection of the two side surfaces in the valve seat pocket that contact the first contact surface and the second contact surface,

[0029] Wherein, the ring groove is formed on the contact angle of the valve seat body, and the positioning ring is fixedly arranged at the installation angle of the valve seat pocket.

[0030] The beneficial effects of the present utility model are as follows:

[0031] 1. By providing a channel on the sealing contact surface of the valve seat body, if the sphere deflects towards the outlet of the valve body due to pressure, creating a certain gap between the valve seat body at the inlet of the valve body and the sphere, when impurity particles enter the gap, it can prevent the impurity particles from accumulating on the sealing contact surface of the valve seat body, and avoid wear between the sealing contact surface and the sphere, thus affecting the service life.

[0032] 2. By providing a first protrusion ring and a second protrusion ring, the sealing contact surface can provide sealing under both high pressure and low pressure. And the sealing contact surface is an uneven plane as a whole, with a fillet transition overall. The setting of the semi-circular protrusions makes it difficult for impurity particles to remain on the first protrusion ring and the second protrusion ring.

[0033] 3. By setting the first contact surface and the second contact surface to form an obtuse angle, the valve seat body can have better resilience when compressed by the sphere.

[0034] 4. By providing a positioning ring and a ring groove, it is convenient to quickly install the valve seat body into the valve seat pocket. And because the valve seat body is elastic, the setting of the positioning ring and the ring groove can prevent the valve seat body from popping out of the valve seat pocket during installation. At the same time, the contact between the positioning ring and the ring groove can also play a sealing role. Combined with the sealing contact surface and the sphere, it can play a dual-sealing role, improving the sealing performance and avoiding leakage and damage.

[0035] 5. By setting the positioning ring in a water droplet shape, it is more convenient and labor-saving to snap the positioning ring into the ring groove. At the same time, the inside of the ring groove is larger than the large end of the water droplet shape of the positioning ring. After the positioning ring is snapped into the ring groove, the small end of the positioning ring is clamped tightly at the opening of the ring groove with an interference fit, and there is still a gap between the large end of the positioning ring and the inner wall of the ring groove. When the sphere compresses the valve seat body through pressure, the gap allows the valve seat body to have a certain compression margin, so that the setting of the ring groove and the positioning ring is not likely to affect the normal operation of the valve seat body. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG Figure 1 is a structural diagram of the present utility model;

[0037] FIG Figure 2 is a cross-sectional view of the present utility model when the valve body is opened;

[0038] FIG Figure 3 is an enlarged schematic view of A in FIG Figure 2 and is also a mating state diagram of the valve seat body and the sphere at the inlet of the valve body when the valve body is opened;

[0039] FIG Figure 4 is a mating state diagram of the valve seat body and the sphere at the outlet of the valve body when the valve body is opened;

[0040] FIG Figure 5It is the mating state diagram of the valve seat body and the sphere at the valve body inlet when the valve body is closed;

[0041] Appendix Figure 6 It is the mating state diagram of the valve seat body and the sphere at the valve body outlet when the valve body is closed;

[0042] Appendix Figure 7 It is the structural diagram of the valve seat body;

[0043] Appendix Figure 8 It is the reverse structural diagram of the valve seat body;

[0044] Appendix Figure 9 It is the partial sectional view of the valve seat pocket;

[0045] Appendix Figure 10 It is the sectional view of the valve seat body;

[0046] Explanation of reference numerals in the drawings: 1. Valve body, 2. Valve seat pocket, 3. Sphere, 4. Valve seat body, 5. Sealing contact surface, 6. Channel, 7. First raised ring, 8. Second raised ring, 9. First contact surface, 10. Second contact surface, 11. Positioning ring, 12. Ring groove, 13. Contact angle, 14. Installation angle. Detailed implementation mode

[0047] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application. In the description of the present application, it should be noted that the terms used here are only for describing specific implementation manners, and are not intended to limit the exemplary embodiments of the present application. For the convenience of description, the dimensions of each part shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0048] Embodiment 1:

[0049] This embodiment provides a valve seat sealing structure for a polyethylene relief ball valve, which is characterized in that it further includes:

[0050] Valve body 1, with two valve seat pockets 2 provided inside thereof;

[0051] Ball 3, rotatably arranged inside the valve body 1 and located between the two valve seat pockets 2;

[0052] Valve seat bodies 4, there are two of them, and the two valve seat bodies 4 are symmetrically arranged inside the two valve seat pockets 2;

[0053] Sealing contact surface 5, the valve seat body 4 has a sealing contact surface 5, and the sealing contact surface 5 of the valve seat body 4 is in sealing connection with the ball 3;

[0054] Channel 6, a channel 6 is provided on the surface of the sealing contact surface 5, and the channel 6 is recessed;

[0055] Positioning component, when the valve seat body 4 is installed, the valve seat body 4 is positioned by the positioning component.

[0056] In this technical solution, the so-called polyethylene relief ball valve is usually used for transmitting gas. During the transmission of gas in the pipeline, due to the erosion of the pipe wall and the fact that the gas itself will carry certain impurity particles, these impurity particles will be transmitted in the pipeline along with the movement of the gas.

[0057] By providing the recessed channel 6, during the transmission of gas, sometimes the pressure forces the ball 3 to shift towards the outlet of the valve body 1. If a part of the valve seat body 4 at the inlet of the valve body 1 loses the sealing connection with the ball 3 and a certain gap is generated, when the impurity particles enter the gap, they will enter the recessed channel 6, preventing the impurity particles from being located on the sealing contact surface 5 between the valve seat body 4 and the ball 3, ensuring the isolation between the impurity particles and the valve seat body 4, reducing the risk of wear and damage to the sealing contact surface 5 of the valve seat body 4. At the same time, during the subsequent rotation of the ball 3, the impurity particles in the channel 6 can be flushed out by the air flow, thereby reducing the wear of the valve seat body 4 and extending the service life of the valve seat body 4.

[0058] At the same time, the transition between the channel 6 and the sealing contact surface 5 of the valve seat body 4 is made by a fillet. The setting of the fillet makes it easier for the impurity particles to be introduced into the channel 6 and also facilitates the impurity particles to be easily flushed out by the air flow.

[0059] Through this structural design, by providing the channel 6 on the sealing contact surface 5 of the valve seat body 4, if the ball 3 shifts towards the outlet of the valve body 1 due to pressure, causing a certain gap between the valve seat body 4 at the inlet of the valve body 1 and the ball 3, when the impurity particles enter the gap, it prevents the impurity particles from accumulating on the sealing contact surface 5 of the valve seat body 4, and the wear between the sealing contact surface 5 and the ball 3 affects the service life.

[0060] Embodiment 2:

[0061] This embodiment provides a valve seat sealing structure for a polyethylene relief ball valve. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0062] Furthermore, the valve seat body 4 includes:

[0063] A first protruding ring 7, which has a semi-circular protrusion;

[0064] Two second protruding rings 8, both of which have semi-circular protrusions, and the protrusion of the first protruding ring 7 is larger than that of the second protruding ring 8;

[0065] Among them, both the first protruding ring 7 and the second protruding ring 8 are located on the sealing contact surface 5, and the first protruding ring 7 is located between the two second protruding rings 8.

[0066] In this technical solution, due to the setting of the first protruding ring 7 and the second protruding ring 8, and the protrusion of the first protruding ring 7 being larger than that of the second protruding ring 8, on the sealing contact surface 5, the first protruding ring 7 is more prominent than the second protruding ring 8, and the first protruding ring 7 is located between the two second protruding rings 8;

[0067] The first protruding ring 7, the second protruding ring 8, and the valve seat body 4 are made of elastic materials;

[0068] This design enables the sealing contact surface 5 to provide sealing under both high pressure and low pressure, and makes the overall sealing contact surface 5 an uneven plane, and the overall is transitioned by rounded corners. Moreover, the setting of the semi-circular protrusions makes it difficult for impurity particles to remain on the first protruding ring 7 and the second protruding ring 8;

[0069] As shown in the attached Figure 3-4 figure, when the valve body 1 is in the open state, the first protruding ring 7 of the valve seat body 4 at the inlet and outlet of the valve body 1 contacts the sphere 3, and the sphere 3 uniformly compresses the valve seat body 4 on both sides slightly, which is used to achieve a sealing effect on the sphere 3;

[0070] As shown in the attached Figure 5-6 figure, when the valve body 1 is in the closed state, the sphere 3 deflects towards the outlet of the valve body 1 due to the pressure generated at the inlet of the valve body 1. The valve seat body 4 at the inlet of the valve body 1 will reset towards the sphere 3 through elasticity, so that the first protruding ring 7 of the valve seat body 4 at the inlet of the valve body 1 contacts the sphere 3 to achieve a sealing effect. The valve seat body 4 at the outlet of the valve body 1 will be compressed due to the deflection of the sphere 3, so that both the first protruding ring 7 and the second protruding ring 8 of the valve seat body 4 at the outlet of the valve body 1 contact the sphere 3 to prevent leakage;

[0071] Through this structural design, by setting the first protruding ring 7 and the second protruding ring 8, the sealing contact surface 5 can provide sealing under high pressure or low pressure, and the overall sealing contact surface 5 is an uneven plane, and the overall is transitioned by rounded corners. Moreover, the setting of the semi-circular protrusions makes it difficult for impurity particles to remain on the first protruding ring 7 and the second protruding ring 8.

[0072] Embodiment 3:

[0073] This embodiment provides a valve seat sealing structure for a polyethylene relief ball valve. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0074] Furthermore, the valve seat body 4 includes:

[0075] A first contact surface 9, which is provided on the valve seat body 4;

[0076] A second contact surface 10, which is also provided on the valve seat body 4;

[0077] Wherein, the first contact surface 9 and the second contact surface 10 are used to contact the valve seat pocket 2. An obtuse angle is formed between the first contact surface 9 and the second contact surface 10, and an acute angle is formed between both the first contact surface 9 and the second contact surface 10 and the contact surface of the valve seat pocket 2.

[0078] In this technical solution, since the valve seat body 4 has elasticity, the setting of the obtuse angle formed by the first contact surface 9 and the second contact surface 10 enables the valve seat body 4 to have better resilience when compressed by the sphere 3. For example, as Figure 6 shown, when the valve seat body 4 is compressed by the sphere 3, the first contact surface 9 and the second contact surface 10 of the valve seat body 4 will have a pressure towards the inside of the valve seat pocket 2, causing the obtuse angle formed by the first contact surface 9 and the second contact surface 10 of the valve seat body 4 to decrease and tend to be a right angle due to the extrusion of the sphere 3 and the contact with the valve seat pocket 2, as shown in the appendix Figure 5 shown. When the pressure decreases, the first contact surface 9 and the second contact surface 10 of the valve seat body 4 will reset to the original obtuse angle structure, and drive the sealing contact surface 5 of the valve seat body 4 to move towards the sphere 3, ensuring that the first protruding ring 7 can contact the valve seat body 4, thereby maintaining a sealed connection.

[0079] Through this structural design, by setting the obtuse angle formed by the first contact surface 9 and the second contact surface 10, the valve seat body 4 can have better resilience when compressed by the sphere 3.

[0080] Embodiment 4:

[0081] This embodiment provides a seat sealing structure for a polyethylene blow-off ball valve. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0082] Further, the seat body 4 is made of thermoplastic.

[0083] In this technical solution, the valve body 1 is made of thermoplastic, and the material can be elastic materials such as polyoxymethylene, nylon, PTFE, PFA, PEEK, FKM, and Buna-N. It can be formed by extrusion, molding, machining, or additive manufacturing processes. At the same time, the valve body 1 can also be made of durable natural polymers or synthetic polymers.

[0084] Through this structural design, the seat body 4 can have excellent wear resistance and corrosion resistance, and has a low friction coefficient and higher temperature resistance, so that the seat body 4 can provide a better sealing effect and a longer service life.

[0085] Embodiment 5:

[0086] This embodiment provides a seat sealing structure for a polyethylene blow-off ball valve. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0087] Further, the positioning assembly includes:

[0088] A positioning ring 11, which is fixedly arranged in the seat pocket 2;

[0089] A ring groove 12, which is opened on the seat body 4.

[0090] In this technical solution, by providing the positioning ring 11 and the positioning assembly, when the seat body 4 needs to be installed into the seat pocket 2, the ring groove 12 of the seat body 4 can be snapped into the positioning ring 11 in the seat pocket 2, so as to position the seat body 4 in the seat pocket 2, which is convenient for the installation of the valve body 1;

[0091] At the same time, the positions of the positioning ring 11 and the ring groove 12 are designed to be positions that do not affect the deformation of the seat body 4, so as to avoid affecting the compression of the seat body 4;

[0092] Through this structural design, by providing the positioning ring 11 and the ring groove 12, it is convenient to quickly install the seat body 4 into the seat pocket 2. And because the seat body 4 has elasticity, the setting of the positioning ring 11 and the ring groove 12 can prevent the seat body 4 from popping out of the seat pocket 2 during installation. At the same time, the contact between the positioning ring 11 and the ring groove 12 can also play a sealing role. Combined with the sealing contact surface 5 and the sphere 3, it can play a dual-sealing role, improving the sealing performance and avoiding leakage and damage.

[0093] Embodiment 6:

[0094] This embodiment provides a seat sealing structure for a polyethylene blow-off ball valve. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0095] Furthermore, the cross-section of the positioning ring 11 is in the shape of a water droplet, and the cross-sectional profile of the annular groove 12 is the same as that of the positioning ring 11.

[0096] In this technical solution, the cross-section of the positioning ring 11 is in the shape of a water droplet, and its small end is fixedly connected to the valve seat pocket 2. After the positioning ring 11 is snapped into the annular groove 12, the water-droplet shape makes the snapping more convenient and labor-saving.

[0097] Moreover, the cross-section of the annular groove 12 is also in the shape of a water droplet. The opening of the annular groove 12 is the small end of the water droplet, and the inside of the annular groove 12 is the large end of the water droplet, making the positioning ring 11 not easily detached. After the positioning ring 11 is snapped into the annular groove 12, the small end of the positioning ring 11 is clamped tightly at the opening of the annular groove 12 and has an interference fit.

[0098] At the same time, the inside of the annular groove 12 is larger than the large end of the water-droplet shape of the positioning ring 11. After the positioning ring 11 is snapped into the annular groove 12, the small end of the positioning ring 11 is clamped tightly at the opening of the annular groove 12 and has an interference fit, and there is still a gap between the large end of the positioning ring 11 and the inner wall of the annular groove 12. When the sphere 3 compresses the valve seat body 4 through pressure, the gap allows the valve seat body 4 to have a certain amount of compression allowance, so that the setting of the annular groove 12 and the positioning ring 11 is not likely to affect the normal operation of the valve seat body 4.

[0099] Through this structural design, by setting the positioning ring 11 in the shape of a water droplet, it is more convenient and labor-saving to snap the positioning ring 11 into the annular groove 12. At the same time, the inside of the annular groove 12 is larger than the large end of the water-droplet shape of the positioning ring 11. After the positioning ring 11 is snapped into the annular groove 12, the small end of the positioning ring 11 is clamped tightly at the opening of the annular groove 12 and has an interference fit, and there is still a gap between the large end of the positioning ring 11 and the inner wall of the annular groove 12. When the sphere 3 compresses the valve seat body 4 through pressure, the gap allows the valve seat body 4 to have a certain amount of compression allowance, so that the setting of the annular groove 12 and the positioning ring 11 is not likely to affect the normal operation of the valve seat body 4.

[0100] Embodiment 7:

[0101] This embodiment provides a seat sealing structure for a polyethylene blow-off ball valve. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0102] Furthermore, it further includes:

[0103] Contact angle 13, which is formed by the intersection of the first contact surface 9 and the second contact surface 10, and the contact angle 13 is a rounded angle.

[0104] With this structural design, the contact angle 13 is set as a rounded corner. Compared with a right angle, a structure with better resilience is formed between the first contact surface 9 and the second contact surface 10 as a whole.

[0105] The rounded corner structure can distribute the stress applied on the first contact surface 9 and the second contact surface 10 more evenly, thereby reducing stress concentration and reducing the permanent deformation of the valve seat body 4 after compression, making the overall service life longer. Since the force on the rounded corner is more uniform, the valve seat body 4 can usually recover to its original state better after rebounding, improving the resilience performance.

[0106] Example 8:

[0107] This embodiment provides a valve seat sealing structure for a polyethylene relief ball valve. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0108] Furthermore, it further includes:

[0109] An installation angle 14, which is formed by the intersection of the two side surfaces in the valve seat pocket 2 that are in contact with the first contact surface 9 and the second contact surface 10.

[0110] Among them, the annular groove 12 is opened on the contact angle 13 of the valve seat body 4, and the positioning ring 11 is fixedly arranged at the installation angle 14 of the valve seat pocket 2.

[0111] With this structural design, the positions of the annular groove 12 and the positioning ring 11 will not affect the normal operation of the valve seat body 4. The contact angle 13 of the valve seat body 4 will approach or move away from the installation angle 14 of the valve seat pocket 2 due to the compression or rebound of the valve seat body 4 during operation. By setting the annular groove 12 and the positioning ring 11 on the same trajectory of the relative movement between the installation angle 14 and the contact angle 13, the positions of the annular groove 12 and the positioning ring 11 can be made not to affect the normal operation of the valve seat body 4.

[0112] The above describes the embodiments of the present application in conjunction with the accompanying drawings. Without conflict, the embodiments in the specification of the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are only illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all belong to the protection scope of the present application.

Claims

1. A valve seat sealing structure of a polyethylene relief ball valve, characterized in that, Further comprising: A valve body (1) with two valve seat pockets (2) formed inside thereof; A sphere (3) rotatably arranged inside the valve body (1) and located between the two valve seat pockets (2); Two valve seat bodies (4) symmetrically arranged inside the two valve seat pockets (2); A sealing contact surface (5), the valve seat body (4) having the sealing contact surface (5), and the sealing contact surface (5) of the valve seat body (4) being sealingly connected to the sphere (3); A channel (6) recessedly provided on the surface of the sealing contact surface (5); A positioning assembly for positioning the valve seat body (4) during installation.

2. The seat sealing structure of a polyethylene relief ball valve according to claim 1, characterized in that, The valve seat body (4) includes: A first protrusion ring (7) having a semi-circular protrusion; Two second protrusion rings (8), each having a semi-circular protrusion, and the protrusion of the first protrusion ring (7) being larger than that of the second protrusion rings (8); Wherein, the first protrusion ring (7) and the second protrusion rings (8) are both located on the sealing contact surface (5), and the first protrusion ring (7) is located between the two second protrusion rings (8).

3. The valve seat sealing structure of a polyethylene relief ball valve according to claim 2, characterized in that, The valve seat body (4) includes: A first contact surface (9) on the valve seat body (4); A second contact surface (10) also on the valve seat body (4); Wherein, the first contact surface (9) and the second contact surface (10) are used to contact the valve seat pocket (2), an obtuse angle is formed between the first contact surface (9) and the second contact surface (10), and an acute angle is formed between both the first contact surface (9) and the second contact surface (10) and the contact surfaces of the valve seat pocket (2).

4. The seat sealing structure of a polyethylene blow-off ball valve according to claim 3, characterized in that: The valve seat body (4) is made of thermoplastic.

5. The seat sealing structure of a polyethylene bleed-off ball valve according to claim 4, characterized in that, The positioning assembly includes: A positioning ring (11) fixedly arranged inside the valve seat pocket (2); A ring groove (12) formed on the valve seat body (4).

6. The valve seat sealing structure of a polyethylene relief ball valve according to claim 5, characterized in that:

7. The valve seat sealing structure of a polyethylene blow-off ball valve according to claim 6, characterized in that, The cross-section of the positioning ring (11) is in the shape of a water droplet, and the cross-sectional contour of the ring groove (12) is the same as that of the positioning ring (11). Further comprising:

8. The seat sealing structure of a polyethylene relief ball valve according to claim 7, characterized in that, A contact angle (13) formed by the intersection of the first contact surface (9) and the second contact surface (10), and the contact angle (13) is a rounded angle. Further comprising: An installation angle (14) formed by the intersection of the two side surfaces inside the valve seat pocket (2) that contact the first contact surface (9) and the second contact surface (10); Wherein, the ring groove (12) is formed on the contact angle (13) of the valve seat body (4), and the positioning ring (11) is fixedly arranged at the installation angle (14) of the valve seat pocket (2).

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