PE blow-off ball valve

Abstract

The utility model discloses a PE (Poly Ethylene) blow-off ball valve, which comprises a valve body and a ball body rotatably arranged in the valve body, the ball body and the valve body are sealed through a sealing assembly, and the PE blow-off ball valve is characterized in that the sealing assembly comprises an inclined ring, one side of the inclined ring is propped against the inner wall of the valve body, and the other side of the inclined ring is propped against the inner wall of the valve body; one side of the ring seat abuts against the outer wall of the ball body, and the other side of the inclined ring is movably connected with the other side of the ring seat; wherein the axis of the inclined ring can incline in the three-dimensional direction relative to the axis of the ring seat, and the inclined ring and the ring seat are arranged, so that even if the flatness of the interior of the valve body has an error, the valve body cannot be damaged; and the inclined ring can be inclined to be attached to the plane in the valve body through the design that the axis of the inclined ring is inclined relative to the axis of the ring base in the three-dimensional direction, the inclination of the inclined ring cannot drive the ring base to incline, and after the ball is installed, the ring base can be attached to the ball without being affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of PE relief ball valves, in particular to a PE relief ball valve. Background Art

[0002] Polyethylene (PE) ball valve is a spherical valve whose valve body and valve core are made of plastic materials such as polyethylene. They are usually light, corrosion-resistant, not easy to scale, and have good sealing properties. Due to its material characteristics, PE ball valves can be well used in gas systems.

[0003] A ball is rotatably arranged inside the valve body of the PE relief ball valve, and the ball and the valve body are sealed by a valve seat. However, the valve bodies of some PE ball valves are formed by injection molding during manufacturing. Sometimes there is an error in the flatness of the inside of the valve body, so that sometimes there is a gap between the valve seat and the inner wall of the valve body after it is inserted, which reduces the sealing performance and causes the valve body to leak. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a PE relief ball valve, comprising a valve body and a ball rotatably arranged in the valve body, wherein the ball and the valve body are sealed by a sealing assembly, characterized in that the sealing assembly comprises:

[0005] A tilted ring, one side of which is disposed in contact with the inner wall of the valve body;

[0006] A ring seat, one side of which is disposed in abutment with the outer wall of the sphere, and the other side of the tilting ring is movably engaged with the other side of the ring seat;

[0007] The axis of the tilted ring can be tilted in three dimensions relative to the axis of the ring seat.

[0008] Furthermore, the cross section of the tilted ring is teardrop-shaped, and a hook groove matching the tilted ring is provided on the other side of the ring seat, and the teardrop-shaped portion of the tilted ring is located in the hook groove.

[0009] Furthermore, the hardness of the inclined ring is smaller than the hardness of the ring seat.

[0010] Furthermore, it also includes:

[0011] A center tube, wherein the center tube is fixedly arranged on the valve body;

[0012] A valve stem, wherein the valve stem is rotatably disposed in the central tube, and the lower end of the valve stem extends into the valve body and is plugged into the upper end of the ball;

[0013] The second sealing assembly is used to seal between the valve stem and the center tube.

[0014] Furthermore, the second sealing assembly includes:

[0015] A first sealing ring, which is sleeved on the valve stem and is used to seal the gap between the valve stem and the center pipe;

[0016] A second sealing ring, wherein the second sealing ring is sleeved on the valve stem and is located above the first sealing ring, and the first sealing ring and the second sealing ring have inclined surfaces on their opposite ends;

[0017] An elastic ring, wherein the elastic ring is located between the first sealing ring and the second sealing ring, and the upper and lower ends of the elastic ring are in contact with the inclined surfaces of the first sealing ring and the second sealing ring respectively;

[0018] A positioning assembly, used for positioning the first sealing ring and the second sealing ring;

[0019] The elastic ring applies a force to the first sealing ring and the second sealing ring through elastic force, so as to move them away from each other and tighten them toward the valve stem.

[0020] Furthermore, the positioning component includes:

[0021] A sleeve, wherein the sleeve is sleeved on the valve stem, and the lower end of the sleeve abuts against the upper end of the second sealing ring;

[0022] A placement groove, wherein the placement groove is provided in the center tube, the valve stem is rotatably disposed in the placement groove, the first sealing ring, the second sealing ring and the elastic ring are all located in the placement groove, the lower end of the first sealing ring is in conflict with the bottom surface of the placement groove, the lower end of the sleeve is located in the placement groove, and the diameter of the sleeve matches the placement groove;

[0023] The fixing component is used to fix the position of the sleeve.

[0024] Furthermore, the fixing assembly includes:

[0025] A threaded surface, wherein the valve stem has a threaded surface, and the lowermost end of the threaded surface is lower than the uppermost end of the sleeve;

[0026] The nut is spirally arranged on the threaded surface of the valve stem, and the lower end of the nut is abutted and connected with the upper end of the sleeve.

[0027] Furthermore, it also includes:

[0028] O-rings, there are two O-rings, the two O-rings are fixedly sleeved on the outer rings of the first sealing ring and the second sealing ring respectively, the outer rings of the O-rings are interference fit with the inner side surface of the placement groove, and the positions of the O-rings are staggered up and down with the inclined surfaces of the first sealing ring and the second sealing ring.

[0029] The beneficial effects of the utility model are:

[0030] 1. The arrangement of the tilting ring and the ring seat ensures that even if there is an error in the flatness of the inside of the valve body, the tilting ring can be tilted and fit with the plane inside the valve body by designing that the axis of the tilting ring is tilted in three dimensions relative to the axis of the ring seat. The tilting of the tilting ring will not cause the ring seat to tilt, so that after the ball is installed, the ring seat can fit with the ball without being affected, so that the ring seat and the tilting ring can play a sealing role between the valve body and the ball.

[0031] 2. By providing a water drop-shaped cross section and an undercut groove, the water drop-shaped cross section cooperates with the undercut groove to prevent the tilting ring from being separated from the undercut groove of the ring seat.

[0032] 3. Since the hardness of the tilting ring is less than that of the ring seat, the tilting ring can move smoothly relative to the ring seat, so that even in the event of an earthquake or ground subsidence, the tilting ring can maintain contact with the inner wall of the valve body, thereby maintaining the high sealing performance of the ball valve.

[0033] 4. The arrangement of the first sealing ring, the second sealing ring and the elastic ring makes it convenient to tighten the first sealing ring and the second sealing ring only toward the valve stem through the elastic ring. At the same time, if a gap occurs due to wear, the load applied by the elastic ring can also be used to drive the first sealing ring and the second sealing ring to be tightened, thereby quickly compensating for the gap. At the same time, due to its elasticity, it can also absorb vibrations and automatically compensate and reset when an earthquake or ground subsidence occurs, thereby maintaining the sealing between the valve stem and the center tube.

[0034] 5. Through this structural design, through the setting of the sleeve and the placement groove, it is convenient to use the sleeve and the placement groove to interfere with the first sealing ring and the second sealing ring up and down to locate their positions, avoiding the first sealing ring and the second sealing ring from being biased apart from each other due to the biasing force generated by the elastic ring, so that the first sealing ring and the second sealing ring can only be tightened toward the valve stem.

[0035] 6. Through this structural design, by setting up a fixing component, it is convenient to fix the movement of the sleeve, preventing the sleeve from moving up and down and affecting the sealing effect of the first sealing component and the second sealing component.

[0036] 7. By setting an O-ring, and setting the outer ring of the O-ring in contact with the inner side of the placement groove, the sealing effect is better, and the position of the O-ring is staggered up and down with the inclined surfaces of the first sealing ring and the second sealing ring, and the outer ring of the O-ring is interference fit with the inner side of the placement groove, so that even if the elastic ring applies a load to the inclined surface, it is not easy to cause the O-ring to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] AttachedFigure 1 It is a structural diagram of the utility model;

[0038] Attached Figure 2 It is a front view of the utility model;

[0039] Attached Figure 3 For attachment Figure 2 A is an enlarged schematic diagram;

[0040] Attached Figure 4 A cross-sectional view of the tilting ring when the axis of the tilting ring is tilted in three dimensions relative to the axis of the ring seat;

[0041] Attached Figure 5 For attachment Figure 2 A magnified schematic diagram of B;

[0042] Attached Figure 6 For attachment Figure 2 A magnified schematic diagram of middle C;

[0043] Explanation of reference numerals: 1. valve body, 2. ball, 3. tilting ring, 4. ring seat, 5. undercut groove, 6. center tube, 7. valve stem, 8. first sealing ring, 9. second sealing ring, 10. elastic ring, 11. sleeve, 12. placement groove, 13. threaded surface, 14. nut, 15. O-ring DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application. In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values, and it should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0045] Embodiment 1:

[0046] This embodiment provides a PE relief ball valve, comprising a valve body 1 and a ball 2 rotatably disposed in the valve body 1, wherein the ball 2 and the valve body 1 are sealed by a sealing assembly, wherein the sealing assembly comprises:

[0047] A tilted ring 3, one side of which is disposed in contact with the inner wall of the valve body 1;

[0048] A ring seat 4, one side of the ring seat 4 is disposed in contact with the outer wall of the sphere 2, and the other side of the tilting ring 3 is movably engaged with the other side of the ring seat 4;

[0049] The axis of the tilted ring 3 can be tilted in three-dimensional directions relative to the axis of the ring seat 4 .

[0050] In the present technical solution, since the inclined ring 3 and the ring seat 4 are provided, the inclined ring 3 and the ring seat 4 form a sealing ring, and the way in which the sealing ring is installed in the ball valve refers to the way in which the valve seat is installed in the ball valve in the prior art, and no further details are given here;

[0051] When the valve body 1 is injection molded to form the PE valve body 1, if there is an error in the flatness of the interior of the valve body 1, the sealing assembly is installed, and the tilting ring 3 fits with the inner wall of the valve body 1, so that the tilting ring 3 is tilted due to the flatness error of the interior of the valve body 1, so that the axis of the tilting ring 3 is tilted in three-dimensional directions relative to the axis of the ring seat 4, so that the tilting of the tilting ring 3 will not cause the ring seat 4 to tilt;

[0052] After the ball 2 is installed, the ring seat 4 can contact the outer side of the ball 2 to seal the ball 2 and the valve body 1, and the other side of the tilting ring 3 and the other side of the ring seat 4 can be movably engaged in contact with each other, and the fluid will not leak from the gap between the tilting ring 3 and the ring seat 4.

[0053] Through this structural design, even if there is an error in the flatness of the interior of the valve body 1, the tilting ring 3 can be tilted and fit with the plane inside the valve body 1 by designing that the axis of the tilting ring 3 is tilted in three dimensions relative to the axis of the ring seat 4. The tilting of the tilting ring 3 will not cause the ring seat 4 to tilt, so that after the ball 2 is installed, the ring seat 4 can fit with the ball 2 without being affected, so that the ring seat 4 and the tilting ring 3 can play a sealing role between the valve body 1 and the ball 2.

[0054] Embodiment 2:

[0055] This embodiment provides a PE relief ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0056] Furthermore, the cross section of the tilted ring 3 is teardrop-shaped, and a hook groove 5 matching the tilted ring 3 is provided on the other side of the ring seat 4 , and the teardrop-shaped portion of the tilted ring 3 is located in the hook groove 5 .

[0057] In the present technical solution, by providing the teardrop-shaped and inverted hook groove 5, the teardrop-shaped cross section of the tilting ring 3 can be matched with the inverted hook groove 5 to firmly confine the teardrop-shaped cross section of the tilting ring 3 within the inverted hook groove 5, thereby engaging the tilting ring 3 with the ring seat 4, so that the axis of the tilting ring 3 can be tilted in three-dimensional directions relative to the axis of the ring seat 4, while preventing the tilting ring 3 from being separated from the inverted hook groove 5 of the ring seat 4.

[0058] Through this structural design, by providing a teardrop-shaped cross section and the undercut groove 5 , the teardrop-shaped cross section cooperates with the undercut groove 5 to prevent the tilting ring 3 from being separated from the undercut groove 5 of the ring seat 4 .

[0059] Embodiment 3:

[0060] This embodiment provides a PE relief ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0061] Furthermore, the hardness of the inclined ring 3 is smaller than the hardness of the ring seat 4 .

[0062] Through this structural design, since the hardness of the tilting ring 3 is less than the hardness of the ring seat 4, the tilting ring 3 can move smoothly relative to the ring seat 4, so that even if an earthquake or ground subsidence occurs, the tilting ring 3 can maintain contact with the inner wall of the valve body 1, thereby maintaining the high sealing performance of the ball valve.

[0063] Embodiment 4:

[0064] This embodiment provides a PE relief ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0065] Furthermore, it also includes:

[0066] A central tube 6, wherein the central tube 6 is fixedly arranged on the valve body 1;

[0067] A valve stem 7, wherein the valve stem 7 is rotatably disposed in the central tube 6, and the lower end of the valve stem 7 extends into the valve body 1 and is plugged into the upper end of the ball 2;

[0068] The second sealing assembly is used to seal between the valve stem 7 and the center tube 6 .

[0069] In the present technical solution, by providing a center tube 6 and a valve stem 7, it is convenient to drive the valve stem 7 to rotate by a tool, and the rotation of the valve stem 7 drives the ball 2 to rotate, so that the ball valve is opened and closed. The provision of the second sealing assembly also plays a sealing role between the valve stem 7 and the center tube 6.

[0070] Embodiment 5:

[0071] This embodiment provides a PE relief ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0072] Furthermore, the second sealing assembly includes:

[0073] A first sealing ring 8, which is sleeved on the valve stem 7 and is used to seal the gap between the valve stem 7 and the center tube 6;

[0074] A second sealing ring 9, which is sleeved on the valve stem 7 and located above the first sealing ring 8, and the first sealing ring 8 and the second sealing ring 9 have inclined surfaces on their opposite ends;

[0075] An elastic ring 10, wherein the elastic ring 10 is located between the first sealing ring 8 and the second sealing ring 9, and the upper and lower ends of the elastic ring 10 are in contact with the inclined surfaces of the first sealing ring 8 and the second sealing ring 9 respectively;

[0076] A positioning assembly, used to position the first sealing ring 8 and the second sealing ring 9;

[0077] The elastic ring 10 exerts a force on the first sealing ring 8 and the second sealing ring 9 to move away from each other and tighten them toward the valve stem 7 through elastic force.

[0078] In the technical solution, by providing a first sealing ring 8, a second sealing ring 9 and an elastic ring 10, the first sealing ring 8 and the second sealing ring 9 are sleeved on the valve stem 7 and the inner rings of the first sealing ring 8 and the second sealing ring 9 are tightly fitted with the valve stem 7, and the positions of the first sealing ring 8 and the second sealing ring 9 are set to the position of blocking the gap between the valve stem 7 and the center tube 6;

[0079] The upper and lower ends of the elastic ring 10 are in contact with the inclined surfaces of the first sealing ring 8 and the second sealing ring 9 respectively, and the inner ring of the elastic ring 10 does not contact the valve stem 7, so that the inclined surfaces of the first sealing ring 8 and the second sealing ring 9 bear all the loads of the elastic ring 10;

[0080] Due to the setting of the inclined surface, the force applied by the elastic ring 10 to the first sealing ring 8 and the second sealing ring 9 can tighten the first sealing ring 8 and the second sealing ring 9 toward the valve stem 7, and can also bias the first sealing ring 8 and the second sealing ring 9 to separate from each other, so that the first sealing ring 8 and the second sealing ring 9 are tightly pressed in the gap between the center tube 6 and the shaft, and the first sealing ring 8 and the second sealing ring 9 are positioned by the setting of the positioning assembly to prevent the first sealing ring 8 and the second sealing ring 9 from being biased and separated from each other due to the biasing force generated by the elastic ring 10, so that the first sealing ring 8 and the second sealing ring 9 can only be tightened toward the valve stem 7;

[0081] Through this structural design, the arrangement of the first sealing ring 8, the second sealing ring 9 and the elastic ring 10 makes it convenient to tighten the first sealing ring 8 and the second sealing ring 9 only toward the valve stem 7 through the elastic ring 10. At the same time, if a gap occurs due to wear, the load applied by the elastic ring 10 can also be used to drive the first sealing ring 8 and the second sealing ring 9 to be tightened, thereby quickly compensating for the gap. At the same time, due to its elasticity, it can also absorb vibrations and automatically compensate and reset when an earthquake or ground subsidence occurs, thereby maintaining the sealing between the valve stem 7 and the center tube 6.

[0082] Embodiment 6:

[0083] This embodiment provides a PE relief ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0084] Furthermore, the positioning component includes:

[0085] A sleeve 11, wherein the sleeve 11 is sleeved on the valve stem 7, and the lower end of the sleeve 11 abuts against the upper end of the second sealing ring 9;

[0086] A placement groove 12, wherein the placement groove 12 is provided in the center tube 6, the valve stem 7 is rotatably disposed in the placement groove 12, the first sealing ring 8, the second sealing ring 9 and the elastic ring 10 are all located in the placement groove 12, the lower end of the first sealing ring 8 is in conflict with the bottom surface of the placement groove 12, the lower end of the sleeve 11 is located in the placement groove 12, and the diameter of the sleeve 11 matches the placement groove 12;

[0087] The fixing assembly is used to fix the position of the sleeve 11 .

[0088] In the technical solution, by providing the sleeve 11 and the placement groove 12, when installing the second sealing assembly, the valve stem 7 is first installed, and then the first sealing ring 8, the elastic ring 10, and the second sealing ring 9 are sequentially inserted from the valve stem 7, and then the sleeve 11 is inserted from the valve stem 7, and the sleeve 11 moves downward from the valve stem 7, so that the first sealing ring 8, the elastic ring 10 and the second sealing ring 9 are pressed into the placement groove 12;

[0089] At this time, the lower end of the first sealing ring 8 will conflict with the bottom surface of the placement groove 12, and the upper end of the second sealing ring 9 will conflict with the sleeve 11. The position of the sleeve 11 can be fixed by the fixing assembly, so that the positions of the first sealing ring 8 and the second sealing ring 9 can be fixed, thereby positioning the first sealing ring 8 and the second sealing ring 9 to avoid the first sealing ring 8 and the second sealing ring 9 being biased apart from each other due to the biasing force generated by the elastic ring 10, so that the first sealing ring 8 and the second sealing ring 9 can only be tightened toward the valve stem 7.

[0090] Through this structural design, by setting the sleeve 11 and the placement groove 12, it is convenient to position the first sealing ring 8 and the second sealing ring 9 by the upper and lower interference of the sleeve 11 and the placement groove 12, thereby preventing the first sealing ring 8 and the second sealing ring 9 from being biased apart from each other due to the biasing force generated by the elastic ring 10, so that the first sealing ring 8 and the second sealing ring 9 can only be tightened toward the valve stem 7.

[0091] Embodiment 7:

[0092] This embodiment provides a PE relief ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0093] Furthermore, the fixing assembly includes:

[0094] A threaded surface 13, wherein the valve stem 7 has a threaded surface 13, and the lowermost end of the threaded surface 13 is lower than the uppermost end of the sleeve 11;

[0095] The nut 14 is spirally disposed on the threaded surface 13 of the valve stem 7 , and the lower end of the nut 14 is in contact with the upper end of the sleeve 11 .

[0096] In the present technical solution, after the sleeve 11 is inserted into the valve stem 7 in the manner of Example 6, the nut 14 is screwed into the threaded surface 13 of the valve stem 7, so that the nut 14 moves downward on the threaded surface 13 of the valve stem 7 through thread transmission, and after the nut 14 is moved to abut against the upper end surface of the sleeve 11, the position of the sleeve 11 can be positioned and fixed to prevent the sleeve 11 from moving up and down;

[0097] Through this structural design, by providing a fixing component, the movement of the sleeve 11 can be fixed conveniently, thereby preventing the sleeve 11 from moving up and down and affecting the sealing effect of the first sealing component and the second sealing component.

[0098] Embodiment 8:

[0099] This embodiment provides a PE relief ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0100] Furthermore, it also includes:

[0101] The O-ring 15 has two O-rings 15, and the two O-rings 15 are fixedly sleeved on the outer rings of the first sealing ring 8 and the second sealing ring 9 respectively. The outer rings of the O-rings 15 are interference fit with the inner side surface of the placement groove 12, and the positions of the O-rings 15 are staggered up and down with the inclined surfaces of the first sealing ring 8 and the second sealing ring 9.

[0102] By providing an O-ring 15, and the outer ring of the O-ring 15 being in contact with the inner side surface of the placement groove 12, the sealing effect is improved, and the position of the O-ring 15 is staggered up and down with the inclined surfaces of the first sealing ring 8 and the second sealing ring 9, and the outer ring of the O-ring 15 is interference fit with the inner side surface of the placement groove 12, so that even if the elastic ring 10 applies a load to the inclined surface, it is not easy to cause the O-ring 15 to deform.

[0103] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of 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-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A PE relief ball valve, comprising a valve body (1) and a ball (2) rotatably arranged in the valve body (1), wherein the ball (2) and the valve body (1) are sealed by a sealing assembly, characterized in that: The sealing assembly comprises: An inclined ring (3), one side of the inclined ring (3) being arranged in contact with the inner wall of the valve body (1); A ring seat (4), one side of the ring seat (4) is arranged to abut against the outer wall of the sphere (2), and the other side of the tilting ring (3) is movably engaged with the other side of the ring seat (4); The axis of the tilted ring (3) can be tilted in three-dimensional directions relative to the axis of the ring seat (4).

2. A PE relief ball valve according to claim 1, characterized in that: The cross section of the tilted ring (3) is in the shape of a water drop, and a hook groove (5) matching the tilted ring (3) is provided on the other side of the ring seat (4), and the water drop shape of the tilted ring (3) is located in the hook groove (5).

3. A PE relief ball valve according to claim 2, characterized in that: The hardness of the inclined ring (3) is smaller than the hardness of the ring seat (4).

4. A PE relief ball valve according to claim 2 or 3, characterized in that: Also includes: A central tube (6), wherein the central tube (6) is fixedly arranged on the valve body (1); A valve stem (7), wherein the valve stem (7) is rotatably disposed in the central tube (6), and the lower end of the valve stem (7) extends into the valve body (1) and is plugged into the upper end of the ball (2); A second sealing component, wherein the second sealing component is used to seal between the valve stem (7) and the center tube (6).

5. A PE relief ball valve according to claim 4, characterized in that: The second sealing assembly comprises: A first sealing ring (8), the first sealing ring (8) being sleeved on the valve stem (7) and used for sealing the gap between the valve stem (7) and the center tube (6); A second sealing ring (9), the second sealing ring (9) is sleeved on the valve stem (7) and is located above the first sealing ring (8), and the first sealing ring (8) and the second sealing ring (9) have inclined surfaces on their opposite ends; An elastic ring (10), wherein the elastic ring (10) is located between the first sealing ring (8) and the second sealing ring (9), and the upper and lower ends of the elastic ring (10) are in contact with the inclined surfaces of the first sealing ring (8) and the second sealing ring (9) respectively; A positioning assembly, used for positioning the first sealing ring (8) and the second sealing ring (9); The elastic ring (10) exerts a force on the first sealing ring (8) and the second sealing ring (9) through elastic force, so as to move them away from each other and tighten them toward the valve stem (7).

6. A PE relief ball valve according to claim 5, characterized in that: The positioning component comprises: A sleeve (11), wherein the sleeve (11) is sleeved on the valve stem (7), and the lower end of the sleeve (11) abuts against the upper end of the second sealing ring (9); A placement groove (12), wherein the placement groove (12) is provided in the center tube (6), the valve stem (7) is rotatably arranged in the placement groove (12), the first sealing ring (8), the second sealing ring (9) and the elastic ring (10) are all located in the placement groove (12), the lower end of the first sealing ring (8) is in contact with the bottom surface of the placement groove (12), the lower end of the sleeve (11) is located in the placement groove (12), and the diameter of the sleeve (11) matches the placement groove (12); The fixing assembly is used to fix the position of the sleeve (11).

7. A PE relief ball valve according to claim 6, characterized in that: The fixing assembly comprises: A threaded surface (13), wherein the valve stem (7) has a threaded surface (13), and the lowermost end of the threaded surface (13) is lower than the uppermost end of the sleeve (11); A nut (14) is spirally arranged on the threaded surface (13) of the valve stem (7), and the lower end of the nut (14) is abutted and connected with the upper end of the sleeve (11).

8. A PE relief ball valve according to claim 7, characterized in that: Also includes: The O-ring (15) has two O-rings (15), and the two O-rings (15) are respectively fixedly sleeved on the outer rings of the first sealing ring (8) and the second sealing ring (9), and the outer rings of the O-rings (15) are interference fit with the inner side surface of the placement groove (12), and the positions of the O-rings (15) are staggered up and down with the inclined surfaces of the first sealing ring (8) and the second sealing ring (9).

Images