Fixed ball valve

Abstract

The utility model discloses a fixed ball valve which comprises a valve body, a valve cover and a valve ball, the valve cover and the valve body are matched together, a valve cavity is formed between the valve cover and the valve body, the valve ball is rotationally arranged in the valve cavity, the fixed ball valve is characterized by further comprising valve seat assemblies, the valve cover and the valve body are both provided with the valve seat assemblies, and the valve seat assemblies are arranged in the valve cavity. The valve seat assembly comprises a valve seat body, a supporting ring and a spring, the supporting ring is arranged in the valve body or the valve deck, the valve seat body is arranged on the supporting ring, the spring is arranged on the supporting ring, one end of the spring abuts against the supporting ring, the other end of the spring abuts against the valve body or the valve deck, a pressure relief hole is formed in the valve ball, and the valve ball is arranged in the pressure relief hole. The valve seat body is used for making tight contact with the valve ball. An O-shaped ring is arranged on the supporting ring and located between the valve body and the supporting ring or between the valve deck and the supporting ring.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a fixed ball valve. Background Art

[0002] The ball valve is a very important valve at present. The structure of the current ball valve is shown in the patent announcement document CN205806550U. The ball valve of this structure is sealed on both sides of the ball by two sealing gaskets. The ball valve of this structure actually faces a problem when in use, that is, there is a large enclosed space between the ball and the valve body when the valve is closed. In the enclosed space, the volume of part of the medium changes with the temperature, so that the pressure fluctuates and the pressure increases abnormally. In severe cases, it will affect the safe operation of the valve. Therefore, for safety reasons, the ball valve of this structure must be equipped with an external pressure relief structure when in use. Utility Model Content

[0003] Aiming at the above problems, the utility model provides a fixed ball valve.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A fixed ball valve comprises a valve body, a valve cover and a valve ball, the valve cover and the valve body are matched together, a valve cavity is formed between the valve cover and the valve body, the valve ball is rotatably arranged in the valve cavity, and also comprises a valve seat assembly, the valve cover and the valve body are provided with the valve seat assembly, the valve seat assembly comprises a valve seat body, a support ring and a spring, the support ring is arranged in the valve body or in the valve cover, the valve seat body is arranged on the support ring, the spring is arranged on the support ring, one end of the spring abuts against the support ring, and the other end of the spring abuts against the valve body or the valve cover, a pressure relief hole is opened on the valve ball, and the valve seat body is used to be in close contact with the valve ball; an O-ring is arranged on the support ring, and the O-ring is located between the valve body and the support ring or between the valve cover and the support ring.

[0006] In this structure, since an O-ring is provided on the support ring, and the support ring is provided in the valve body or the valve cover, it is equivalent to providing support rings on both sides of the valve ball. Since the O-ring can seal both sides (i.e., bidirectional sealing), this type of ball valve is equivalent to taking bidirectional sealing measures on both sides of the valve ball, that is, the valve seat assembly is a bidirectionally sealed valve seat assembly.

[0007] In this type of ball valve, it is assumed that the water inflow direction of the valve ball is upstream, and the water outflow direction of the valve ball is downstream (upstream and downstream are relative). In this ball valve, since a two-way sealing structure is set on both sides of the ball valve (i.e., upstream and downstream directions), when this type of ball valve closes the valve, the side of the valve ball with the pressure relief hole is located on the upstream side, and the medium enters the cavity inside the valve ball through the pressure relief hole. When the medium pressure acts on the downstream valve side seat assembly, since the valve seat assembly is bidirectionally sealed, the upstream medium pressure is cut off at this time. When the pressure in the cavity of the valve ball changes abnormally, the medium pressure releases the pressure through the pressure relief hole to ensure the safe operation of the valve, and since bidirectionally sealed valve seat assemblies are used on both sides, when the upstream and downstream are switched (i.e., the pressure relief direction needs to be switched), the entire valve ball can be rotated 180 degrees without re-disassembly.

[0008] In summary, this type of fixed ball valve is provided with a bidirectional sealing structure upstream and downstream of the valve ball, and a pressure relief hole is provided on the valve ball. When the pressure in the valve cavity changes abnormally, the pressure can be released through the pressure relief hole to ensure the safe operation of the entire ball valve. When the upstream and downstream of the ball valve are reversed, it is only necessary to rotate the valve ball 180 degrees without re-disassembly, which is more convenient to use.

[0009] In this ball valve, since one end of the spring abuts against the valve body or valve cover and the other end of the spring abuts against the support ring, the spring has a tendency for the support ring to bounce toward the valve ball, thus ensuring that the valve seat body can be tightly attached to the valve ball from both sides.

[0010] Optionally, the valve seat assembly further comprises a fireproof ring, wherein the fireproof ring is arranged on the support ring, and the fireproof ring is located between the valve body and the support ring or between the valve cover and the support ring.

[0011] Optionally, it further includes a first valve stem and a second valve stem, wherein the first valve stem and the second valve stem are both arranged on the valve ball, and the first valve stem and the second valve stem are in a straight line.

[0012] Specifically, the first valve stem and the valve ball are in a relatively fixed state, and the valve ball can be driven to rotate by the first valve stem, while the second valve stem and the valve ball are in a relatively rotatable state, and one end of the second valve stem is located in the sink groove of the valve ball.

[0013] Optionally, a stuffing box is further included, which is detachably mounted on the valve body by a first screw, and a stuffing is arranged between the first valve stem and the stuffing box.

[0014] The function of the packing is to seal the gap between the stuffing box and the first valve stem.

[0015] Optionally, it also includes a gland, which is installed on the valve body by bolts, a compression sleeve is arranged between the gland and the packing, and the first valve stem and the compression sleeve are rotatably matched together.

[0016] The function of the pressing sleeve is cylindrical, and the function of the pressing sleeve is to compress the packing, and the pressing sleeve is rotatably matched with the first valve stem.

[0017] Optionally, a third sealing ring is provided between the stuffing box and the valve body.

[0018] Optionally, the second valve stem is detachably fixed to the valve body by the second screw, and the second valve stem is rotationally fitted with the valve ball.

[0019] Optionally, a fourth sealing ring is provided between the second valve stem and the valve body.

[0020] The fourth sealing ring is used to seal between the second valve stem and the valve body.

[0021] Optionally, a first sealing ring and a second sealing ring are arranged between the valve body and the valve cover.

[0022] The first sealing ring and the second sealing ring are used to seal between the valve body and the valve cover.

[0023] Optionally, the valve body and the valve cover are fitted together via studs and nuts.

[0024] Studs and nuts are used to connect and fix the valve body and valve cover together.

[0025] The beneficial effects of the utility model are as follows: a bidirectional sealing structure is arranged at the upstream and downstream of the valve ball, and a pressure relief hole is arranged on the valve ball. When the pressure in the valve cavity changes abnormally, the pressure can be released through the pressure relief hole to ensure the safe operation of the entire ball valve. When the upstream and downstream of the ball valve are reversed, it is only necessary to rotate the valve ball 180 degrees without re-disassembly and reassembly, which is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a trunnion-mounted ball valve;

[0027] Figure 2 It is a schematic diagram of the structure of the valve seat assembly;

[0028] Figure 3 It is a schematic diagram of the structure of the valve ball;

[0029] Figure 4 This is a schematic diagram showing the state where the pressure relief hole is located on the upstream side;

[0030] Figure 5 This is a schematic diagram showing the state where the pressure relief hole is located on the downstream side.

[0031] The reference numerals in the figure are: 1. valve body; 2. valve ball; 3. valve cover; 4. support ring; 5. valve seat body; 6. O-ring; 7. spring; 8. fireproof ring; 9. second valve stem; 10. first valve stem; 11. stuffing box; 12. stuffing; 13. gland; 14. nut; 15. bolt; 16. first screw; 17. gland; 18. first sealing ring; 19. second sealing ring; 20. second screw; 21. fourth sealing ring; 22. third sealing ring; 23. bolt; 400, valve seat assembly. DETAILED DESCRIPTION

[0032] The utility model is described in detail below in conjunction with the accompanying drawings.

[0033] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a fixed ball valve comprises a valve body 1, a valve cover 3 and a valve ball 2. The valve cover 3 is matched with the valve body 1, a valve cavity is formed between the valve cover 3 and the valve body 1, and the valve ball 2 is rotatably arranged in the valve cavity. It also comprises a valve seat assembly 400. The valve cover 3 and the valve body 1 are both provided with valve seat assemblies 400. The valve seat assembly 400 comprises a valve seat body 5, a support ring 4 and a spring 7. The support ring 4 is arranged in the valve body 1 or in the valve cover 3, the valve seat body 5 is arranged on the support ring 4, the spring 7 is arranged on the support ring 4, one end of the spring 7 abuts against the support ring 4, and the other end of the spring 7 abuts against the valve body 1 or the valve cover 3. A pressure relief hole is opened on the valve ball 2, and the valve seat body 5 is used to be in close contact with the valve ball 2; an O-ring 6 is arranged on the support ring 4, and the O-ring 6 is located between the valve body 1 and the support ring 4 or between the valve cover 3 and the support ring 4.

[0034] In this structure, since the O-ring 6 is provided on the support ring 4, and the support ring 4 is provided in the valve body 1 or the valve cover 3, it is equivalent to that the support ring 4 is provided on both sides of the valve ball 2. Since the O-ring 6 can seal both sides (i.e., bidirectional sealing), this type of ball valve is equivalent to taking bidirectional sealing measures on both sides of the valve ball 2, that is, the valve seat assembly 400 is a bidirectionally sealed valve seat assembly 400.

[0035] In this ball valve, it is assumed that the water inflow direction of the valve ball 2 is upstream, and the water outflow direction of the valve ball 2 is downstream (upstream and downstream are relative). In this ball valve, since both sides of the ball valve (i.e., upstream and downstream directions) are provided with a bidirectional sealing structure, when this ball valve is closed, the side of the valve ball 2 with the pressure relief hole is located on the upstream side (this state is shown in the attached figure). Figure 4As shown in the figure, the medium enters the cavity of the valve ball 2 through the pressure relief hole. When the medium pressure acts on the downstream valve side seat assembly, the valve seat assembly 400 is bidirectionally sealed, and the upstream medium pressure is cut off at this time. When the pressure in the cavity of the valve ball 2 changes abnormally, the medium pressure is released through the pressure relief hole to ensure the safe operation of the valve. Since the valve seat assembly 400 with bidirectional sealing is used on both sides, when the upstream and downstream are switched (that is, the pressure relief direction needs to be switched), the entire valve ball 2 can be rotated 180 degrees (the position of the pressure relief hole at this time is shown in the attached figure). Figure 5 ), no need to disassemble again.

[0036] In summary, this type of fixed ball valve is provided with a bidirectional sealing structure upstream and downstream of the valve ball 2, and a pressure relief hole is provided on the valve ball 2. When the pressure in the valve cavity changes abnormally, the pressure can be released through the pressure relief hole to ensure the safe operation of the entire ball valve. When the upstream and downstream of the ball valve are reversed, it is only necessary to rotate the valve ball 2 180 degrees without re-disassembly, which is more convenient to use.

[0037] For details, please refer to the attached Figure 3 As shown in FIG. 1 , the structure of the valve ball 2 is as shown in FIG. Figure 3 As shown in , there is a hollow cavity inside the valve ball 2, and the pressure relief hole is connected to the hollow cavity.

[0038] In this ball valve, since one end of the spring 7 abuts against the valve body 1 or the valve cover 3 and the other end of the spring 7 abuts against the support ring 4, the spring 7 has a tendency to bounce the support ring 4 toward the valve ball 2, thereby ensuring that the valve seat body 5 can be tightly attached to the valve ball 2 from both sides.

[0039] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the valve seat assembly 400 also includes a fireproof ring 8, which is arranged on the support ring 4, and the fireproof ring 8 is located between the valve body 1 and the support ring 4 or between the valve cover 3 and the support ring 4.

[0040] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a first valve stem 10 and a second valve stem 9. The first valve stem 10 and the second valve stem 9 are both arranged on the valve ball 2, and the first valve stem 10 and the second valve stem 9 are in a straight line.

[0041] Specifically, the first valve stem 10 and the valve ball 2 are in a relatively fixed state, and the valve ball 2 can be driven to rotate by the first valve stem 10 , while the second valve stem 9 and the valve ball 2 are in a relatively rotatable state, and one end of the second valve stem 9 is located in the sink groove of the valve ball 2 .

[0042] As attached Figure 1 , Attachment Figure 2 And attached Figure 3As shown, it also includes a packing 12 box 11, which is detachably mounted on the valve body 1 by a first screw 16, and a packing 12 is arranged between the first valve stem 10 and the packing 12 box 11.

[0043] The function of the packing 12 is to seal the gap between the packing box 11 and the first valve stem 10 .

[0044] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a gland 13, which is installed on the valve body 1 through bolts 23. A compression sleeve 17 is arranged between the gland 13 and the packing 12, and the first valve stem 10 and the compression sleeve 17 are rotatably matched together.

[0045] The pressing sleeve 17 is cylindrical and its function is to compress the packing 12 . The pressing sleeve 17 is rotatably matched with the first valve stem 10 .

[0046] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a third sealing ring 22 is provided between the stuffing box 12 and the valve body 1 .

[0047] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the second valve stem 9 is detachably fixed to the valve body 1 by a second screw 20 , and the second valve stem 9 and the valve ball 2 are rotatably matched together.

[0048] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a fourth sealing ring 21 is arranged between the second valve stem 9 and the valve body 1 .

[0049] The fourth sealing ring 21 serves to seal between the second valve stem 9 and the valve body 1 .

[0050] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a first sealing ring 18 and a second sealing ring 19 are arranged between the valve body 1 and the valve cover 3 .

[0051] The first sealing ring 18 and the second sealing ring 19 function to seal between the valve body 1 and the valve cover 3 .

[0052] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the valve body 1 and the valve cover 3 are matched together through studs and nuts 14.

[0053] The stud and nut 14 are used to connect and fix the valve body 1 and the valve cover 3 together.

[0054] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A fixed ball valve, comprising a valve body, a valve cover and a valve ball, wherein the valve cover cooperates with the valve body, a valve cavity is formed between the valve cover and the valve body, and the valve ball is rotatably arranged in the valve cavity, characterized in that: It also includes a valve seat assembly, which is disposed on the valve cover and the valve body. The valve seat assembly includes a valve seat body, a support ring and a spring. The support ring is disposed in the valve body or in the valve cover, the valve seat body is disposed on the support ring, and the spring is disposed on the support ring. One end of the spring abuts against the support ring, and the other end of the spring abuts against the valve body or the valve cover. A pressure relief hole is provided on the valve ball, and the valve seat body is used to be in close contact with the valve ball; an O-ring is disposed on the support ring, and the O-ring is located between the valve body and the support ring or between the valve cover and the support ring.

2. The trunnion-mounted ball valve according to claim 1, characterized in that: The valve seat assembly also includes a fireproof ring, which is arranged on the support ring and is located between the valve body and the support ring or between the valve cover and the support ring.

3. The trunnion-mounted ball valve according to claim 1, characterized in that: It also includes a first valve stem and a second valve stem, wherein the first valve stem and the second valve stem are both arranged on the valve ball, and the first valve stem and the second valve stem are in a straight line.

4. The trunnion-mounted ball valve according to claim 3, characterized in that: It also includes a stuffing box, which is detachably mounted on the valve body through a first screw, and a stuffing is arranged between the first valve stem and the stuffing box.

5. The trunnion-mounted ball valve according to claim 4, characterized in that: It also includes a gland, which is installed on the valve body through bolts, a compression sleeve is arranged between the gland and the packing, and the first valve stem is rotatably matched with the compression sleeve.

6. The trunnion-mounted ball valve according to claim 4, characterized in that: A third sealing ring is arranged between the stuffing box and the valve body.

7. The trunnion-mounted ball valve according to claim 3, characterized in that: The second valve stem is detachably fixed to the valve body by a second screw, and the second valve stem is rotatably matched with the valve ball.

8. The trunnion-mounted ball valve according to claim 7, characterized in that: A fourth sealing ring is arranged between the second valve stem and the valve body.

9. The trunnion-mounted ball valve according to claim 1, characterized in that: A first sealing ring and a second sealing ring are arranged between the valve body and the valve cover.

10. The trunnion-mounted ball valve according to claim 1, characterized in that: The valve body and the valve cover are matched together through studs and nuts.

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