High-sealing wear-resistant alloy surfacing fixed ball valve

Abstract

The utility model discloses a high-sealing wear-resistant alloy surfacing fixed ball valve which comprises a valve body, a valve cover, a valve rod and a ball body, the valve cover is installed on the upper portion of the valve body, the valve rod penetrates through the valve cover, the inner end of the valve rod is in linkage connection with the ball body, and valve seats are further installed on the two sides, corresponding to the ball body, of the inner wall of the valve body. The valve seat comprises a valve seat body, a supporting ring, a pressing ring and a wear-resistant ring, a mounting slope is arranged at the end, close to the ball body, of the valve seat body, the supporting ring is mounted at the position, corresponding to the inner periphery of the mounting slope, of the valve seat body, an annular groove is formed between the mounting slope and the supporting ring, and the pressing ring is mounted at the position, corresponding to the outer periphery of the mounting slope, of the valve seat body. The end, close to the ball, of the pressing ring is provided with a pressing flange extending in the inner circumferential direction and used for pressing the wear-resisting ring in the annular groove, and wear-resisting alloy is overlaid at the end, close to the ball, of the wear-resisting ring. According to the utility model, the detachable wear-resistant ring is arranged on the sealing surface of the valve seat, so that only the wear-resistant ring needs to be replaced independently after the wear-resistant ring is worn, and the later maintenance cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a high-sealing and wear-resistant alloy surfacing fixed ball valve. Background Technique

[0002] Ball valves are widely used in fluid control. In fluid control applications, ball valves in pipelines are mainly used to open, close, distribute the flow of fluid media, change the flow direction and flow rate of fluid media, etc.

[0003] The invention patent with the patent publication (announcement) number of CN1074516C discloses a ball valve, which has a valve body, a valve core, an upper valve shaft and a lower valve shaft, and there are two valve seats, namely an inlet and an outlet, provided on the valve body. The valve seats are rigid valve seats. On both sides of the support hole of the upper valve shaft of the valve core, there are upper deformation grooves in the same direction as the valve core hole. On both sides of the lower valve shaft hole of the valve core, there are lower deformation grooves in the same direction as the valve core hole and communicating with the valve core hole. The lower end of the lower deformation groove expands to form a deformation acting force groove with the same width as the short axis diameter of the elliptical shaft platform on the lower valve shaft and the same height as the height of the elliptical shaft platform. Among them, the rigid valve seat is formed by surfacing hard alloy at the position of the valve seat of the valve body and then processed. After long-term use of the valve seat, the hard alloy will still wear, and at this time, the entire valve seat needs to be replaced, resulting in a relatively high cost. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-sealing and wear-resistant alloy surfacing fixed ball valve. By installing a detachable wear-resistant ring on the sealing surface of the valve seat, only the wear-resistant ring needs to be replaced separately after the wear-resistant ring wears, which greatly reduces the later maintenance cost.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a high-sealing and wear-resistant alloy surfacing fixed ball valve, including a valve body, a valve cover, a valve rod and a ball. The valve cover is installed on the upper part of the valve body. The valve rod penetrates through the valve cover, and the inner end of the valve rod is linked with the ball. On both sides of the ball corresponding to the inner wall of the valve body, there are also installed valve seats for forming a sealing fit with the ball when the valve is closed. The valve seat includes a valve seat body, a support ring, a pressing ring and a wear-resistant ring. One end of the valve seat body close to the ball is provided with an installation inclined surface. The support ring is installed at the position inside the circumference corresponding to the installation inclined surface of the valve seat body. An annular groove with a conical cross-section is formed between the installation inclined surface and the support ring. The pressing ring is installed at the position outside the circumference corresponding to the installation inclined surface of the valve seat body. The cross-section of the wear-resistant ring is in the shape of a right triangle. One end of the pressing ring close to the ball is provided with a pressing flange extending in the inner circumferential direction for pressing the wear-resistant ring in the annular groove. One end of the wear-resistant ring close to the ball is surfaced with wear-resistant alloy.

[0006] By adopting the above technical solution, a detachable wear-resistant ring is arranged on the sealing surface of the valve seat body. After the wear-resistant ring is worn, only the wear-resistant ring needs to be replaced separately. The wear-resistant ring is smaller in volume and uses less material compared to the entire valve seat, greatly reducing the later maintenance cost.

[0007] The present utility model is further configured such that an annular slot is provided at one end of the valve seat body close to the sphere, and the support ring is inserted into the annular slot.

[0008] By adopting the above technical solution, the installation structure of the support ring is simple and reliable, and the disassembly and assembly are very convenient.

[0009] The present utility model is further configured such that the support ring is made of fluororubber material, and an annular metal skeleton is provided inside the support ring.

[0010] By adopting the above technical solution, not only can the sealing performance between the support ring and the wear-resistant ring be ensured, preventing the upstream medium from leaking to the downstream through the gap between the two, but also its own strength can be guaranteed.

[0011] The present utility model is further configured such that a first sealing ring for forming a sealing fit with the wear-resistant ring is installed on the pressing flange.

[0012] By adopting the above technical solution, the sealing performance between the pressing flange and the wear-resistant ring can be ensured, preventing the upstream medium from leaking to the downstream through the gap between the two.

[0013] The present utility model is further configured such that the pressing ring is sleeved on the outer periphery of the valve seat ring. A plurality of guide grooves are provided on the outer periphery of the pressing ring. A guide hole is provided through the inner end of the guide groove. A limiting step is formed between the guide groove and the guide hole. An annular locking groove is provided on the outer periphery of the valve seat body. A guide rod is inserted through the guide hole. A hemispherical head limiting portion is provided at the outer end of the guide rod. A first spring is sleeved on the outer periphery of the guide rod. The two ends of the first spring respectively abut against the limiting step and the hemispherical head limiting portion. An adjusting ring for pressing the inner end of the guide rod into the annular locking groove is threadedly connected to the outer periphery of the pressing ring.

[0014] By adopting the above technical solution, when the adjusting ring is tightened, the adjusting ring presses the inner end of the guide rod into the annular locking groove to realize the installation of the pressing ring, and then lock the wear-resistant ring. When the adjusting ring is loosened, the adjusting ring leaves the guide rod, and the guide rod moves outward under the action of the first spring and disengages from the annular locking groove. At this time, the pressing ring can be taken out to replace the wear-resistant ring.

[0015] The present utility model is further configured such that a tapered guiding surface with a large outer and small inner diameter is provided on the inner side of the adjusting ring away from the sphere end.

[0016] By adopting the above technical solution, the guide rod can be guided, which is more conducive to the assembly of the valve seat.

[0017] The present utility model is further configured such that a locking nut is also threadedly connected to the outer periphery of the pressing ring, and the locking nut abuts tightly against the adjusting ring.

[0018] By adopting the above technical solution, when the locking nut abuts tightly against the adjusting ring, the frictional force of the thread between the adjusting ring and the pressing ring can be increased, thereby achieving the effect of preventing the adjusting ring from loosening.

[0019] The present utility model is further configured such that a chute extending axially is provided on the inner wall of the valve body, the valve seat body is slidably disposed in the chute, a supporting flange is provided on the outer periphery of the valve seat body, spring grooves are further provided on the inner wall of the valve body and are distributed in a circumferential array, and a second spring is embedded in the spring groove, and the outer end of the second spring abuts tightly against the supporting flange.

[0020] By adopting the above technical solution, the valve seat is designed as a floating structure, that is, the valve seat always abuts tightly against the surface of the sphere under the action of the second spring, further improving the sealing performance when the valve is closed.

[0021] The present utility model is further configured such that at least two second sealing rings for forming a sealing fit with the inner circular surface of the chute are installed on the outer periphery of the valve seat body.

[0022] By adopting the above technical solution, the sealing performance between the valve seat body and the inner circular surface of the chute can be ensured, and the leakage of the upstream medium from the gap between the two can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0024] Figure 2 is Figure 1 an enlarged schematic structural diagram of part A in

[0025] In the figure: 1, valve body; 2, valve cover; 3, valve rod; 4, sphere; 5, valve seat; 6, valve seat body; 7, support ring; 8, pressing ring; 9, wear-resistant ring; 10, installation inclined surface; 11, annular groove; 12, pressing flange; 13, wear-resistant alloy; 14, annular slot; 15, annular metal skeleton; 16, first sealing ring; 17, guide groove; 18, guide hole; 19, limiting step; 20, annular locking groove; 21, guide rod; 22, hemispherical head limiting portion; 23, first spring; 24, adjusting ring; 25, conical guiding surface; 26, locking nut; 27, chute; 28, supporting flange; 29, spring groove; 30, second spring; 31, second sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment: As shown in the attached Figure 1 and the attached Figure 2 high-sealing wear-resistant alloy surfacing fixed ball valve, which includes a valve body 1, a valve cover 2, a valve stem 3 and a ball 4. The valve cover 2 is installed on the upper part of the valve body 1. The valve stem 3 penetrates through the valve cover 2, and the inner end of the valve stem 3 is linked with the ball 4. On both sides of the ball 4 corresponding to the inner wall of the valve body 1, there are also installed valve seats 5 for forming a sealing fit with the ball 4 when the valve is closed. The valve seat 5 includes a valve seat body 6, a support ring 7, a pressing ring 8 and a wear-resistant ring 9. One end of the valve seat body 6 close to the ball 4 is provided with an installation inclined surface 10. The support ring 7 is installed at the position of the valve seat body 6 corresponding to the inner circumference of the installation inclined surface 10. An annular groove 11 with a conical cross-section is formed between the installation inclined surface 10 and the support ring 7. The pressing ring 8 is installed at the position of the valve seat body 6 corresponding to the outer circumference of the installation inclined surface 10. The cross-section of the wear-resistant ring 9 is in the shape of a right triangle. One end of the pressing ring 8 close to the ball 4 is provided with a pressing flange 12 extending in the inner circumferential direction for pressing the wear-resistant ring 9 in the annular groove 11. A wear-resistant alloy 13, specifically, such as WC hard alloy, is surfacing welded at one end of the wear-resistant ring 9 close to the ball 4. By providing a detachable wear-resistant ring 9 on the sealing surface of the valve seat body 6, only the wear-resistant ring 9 needs to be replaced separately after it is worn. The wear-resistant ring 9 has a smaller volume and less material consumption compared to the entire valve seat 5, greatly reducing the later maintenance cost.

[0028] As shown in the attached Figure 2 figure, an annular slot 14 is provided at one end of the valve seat body 6 close to the ball 4, and the support ring 7 is inserted into the annular slot 14, and the two are in interference fit. The installation structure of the support ring 7 is simple and reliable, and the disassembly and assembly are very convenient.

[0029] As shown in the attached Figure 2 figure, the support ring 7 is made of fluororubber material, and an annular metal skeleton 15 is provided inside the support ring 7. This design can not only ensure the sealing performance between the support ring 7 and the wear-resistant ring 9, avoiding the leakage of the upstream medium from the gap between the two to the downstream, but also ensure its own strength.

[0030] As shown in the attached Figure 2As shown, a first sealing ring 16 for forming a sealing fit with the wear-resistant ring 9 is installed on the pressing flange 12. This design can ensure the sealing performance between the pressing flange 12 and the wear-resistant ring 9, and prevent the upstream medium from leaking to the downstream through the gap between the two.

[0031] As shown in the Figure 2 attachment, the pressing ring 8 is sleeved on the outer periphery of the valve seat 5. A plurality of guide grooves 17 are provided on the outer periphery of the pressing ring 8. A guide hole 18 is provided at the inner end of the guide groove 17 in a penetrating manner. A limiting step 19 is formed between the guide groove 17 and the guide hole 18. An annular locking groove 20 is provided on the outer periphery of the valve seat body 6. A guide rod 21 is inserted into the guide hole 18. A hemispherical head limiting portion 22 is provided at the outer end of the guide rod 21. A first spring 23 is sleeved on the outer periphery of the guide rod 21. The two ends of the first spring 23 are respectively abutted against the limiting step 19 and the hemispherical head limiting portion 22. An adjusting ring 24 for pressing the inner end of the guide rod 21 into the annular locking groove 20 is threadedly connected to the outer periphery of the pressing ring 8. Specifically, the inner circular surface of the adjusting ring 24 is provided with internal threads, and the outer periphery of the pressing ring 8 has external threads that match the internal threads. When the adjusting ring 24 is tightened, the adjusting ring 24 presses the inner end of the guide rod 21 into the annular locking groove 20, realizing the installation of the pressing ring 8, and then locking the wear-resistant ring 9; when the adjusting ring 24 is loosened, the adjusting ring 24 moves away from the guide rod 21, and the guide rod 21 moves outward under the action of the first spring 23 and disengages from the annular locking groove 20. At this time, the pressing ring 8 can be taken out to replace the wear-resistant ring 9.

[0032] As shown in the Figure 2 attachment, a tapered guide surface 25 with a large outer diameter and a small inner diameter is provided on the inner side of the adjusting ring 24 away from the sphere 4. This design can guide the guide rod 21 and is more conducive to the assembly of the valve seat 5.

[0033] As shown in the Figure 2 attachment, a locking nut 26 is also threadedly connected to the outer periphery of the pressing ring 8, and the locking nut 26 abuts against the adjusting ring 24. When the locking nut 26 abuts against the adjusting ring 24, the thread friction between the adjusting ring 24 and the pressing ring 8 can be increased, thereby achieving the effect of preventing the adjusting ring 24 from loosening.

[0034] As shown in the Figure 2 attachment, a chute 27 extending axially is provided on the inner wall of the valve body 1. The valve seat body 6 is slidably arranged in the chute 27. A support flange 28 is provided on the outer periphery of the valve seat body 6. Spring grooves 29 arranged in a circumferential array are also provided on the inner wall of the valve body 1. A second spring 30 is embedded in the spring groove 29. The outer end of the second spring 30 abuts against the support flange 28. The valve seat 5 is designed as a floating structure, that is, the valve seat 5 always abuts against the surface of the sphere 4 under the action of the second spring 30, further improving the sealing performance when the valve is closed.

[0035] As shown in theFigure 2 As shown, at least two second sealing rings 31 for forming a sealing fit with the inner circular surface of the chute 27 are installed on the outer periphery of the valve seat body 6. This design can ensure the sealing performance between the valve seat body 6 and the inner circular surface of the chute 27, and prevent the upstream medium from leaking through the gap between the two.

Claims

1. High-sealing wear-resistant alloy surfacing fixed ball valve, including valve body (1), valve cover (2), valve stem (3) and ball (4), the valve cover (2) is installed on the upper part of the valve body (1), the valve stem (3) penetrates through the valve cover (2), and the inner end of the valve stem (3) is linked and connected with the ball (4), and valve seats (5) for forming a sealing fit with the ball (4) when the valve is closed are further installed on both sides of the inner wall of the valve body (1) corresponding to the ball (4); It is characterized in that: The valve seat (5) includes a valve seat body (6), a support ring (7), a retaining ring (8), and a wear-resistant ring (9). One end of the valve seat body (6) close to the sphere (4) is provided with a mounting inclined surface (10). The support ring (7) is installed at a position corresponding to the inner circumference of the mounting inclined surface (10) of the valve seat body (6). An annular groove (11) with a conical cross-section is formed between the mounting inclined surface (10) and the support ring (7). The retaining ring (8) is installed at a position corresponding to the outer circumference of the mounting inclined surface (10) of the valve seat body (6). The cross-section of the wear-resistant ring (9) is in the shape of a right triangle. One end of the retaining ring (8) close to the sphere (4) is provided with a pressing flange (12) extending in the inner circumferential direction for pressing the wear-resistant ring (9) in the annular groove (11). A wear-resistant alloy (13) is surfacing-welded at one end of the wear-resistant ring (9) close to the sphere (4).

2. The highly sealed wear-resistant alloy surfacing fixed ball valve according to claim 1, characterized in that: One end of the valve seat body (6) close to the sphere (4) is provided with an annular slot (14), and the support ring (7) is inserted into the annular slot (14).

3. The highly sealed and wear-resistant alloy surfacing fixed ball valve according to claim 1, wherein: The support ring (7) is made of fluororubber material, and an annular metal skeleton (15) is provided inside the support ring (7).

4. The high-sealing wear-resistant alloy surfacing fixed ball valve according to claim 1, wherein: A first sealing ring (16) for forming a sealing fit with the wear-resistant ring (9) is installed on the pressing flange (12).

5. The high-sealing wear-resistant alloy surfacing fixed ball valve according to claim 1, characterized in that: The retaining ring (8) is sleeved on the outer circumference of the valve seat (5). A plurality of guide grooves (17) are provided on the outer circumference of the retaining ring (8). A guide hole (18) is provided in communication with the inner end of the guide groove (17). A limiting step (19) is formed between the guide groove (17) and the guide hole (18). An annular locking groove (20) is provided on the outer circumference of the valve seat body (6). A guide rod (21) is inserted into the guide hole (18). A hemispherical head limiting portion (22) is provided at the outer end of the guide rod (21). A first spring (23) is sleeved on the outer circumference of the guide rod (21). The two ends of the first spring (23) are respectively abutted against the limiting step (19) and the hemispherical head limiting portion (22). An adjusting ring (24) is threadedly connected to the outer circumference of the retaining ring (8) for pressing the inner end of the guide rod (21) into the annular locking groove (20).

6. The high-sealing wear-resistant alloy surfacing fixed ball valve according to claim 5, characterized in that: A tapered guide surface (25) with a large outer and small inner diameter is provided on the inner side of one end of the adjusting ring (24) away from the sphere (4).

7. The highly-sealed wear-resistant alloy surfacing fixed ball valve according to claim 5, wherein: A locking nut (26) is also threadedly connected to the outer circumference of the retaining ring (8), and the locking nut (26) is abutted against the adjusting ring (24).

8. The high-sealing wear-resistant alloy surfacing fixed ball valve according to claim 1, characterized in that: A chute (27) extending axially is provided on the inner wall of the valve body (1). The valve seat body (6) is slidably arranged in the chute (27). A support flange (28) is provided on the outer circumference of the valve seat body (6). Spring grooves (29) distributed in a circumferential array are also provided on the inner wall of the valve body (1). A second spring (30) is embedded in the spring groove (29). The outer end of the second spring (30) is abutted against the support flange (28).

9. The highly-sealed wear-resistant alloy surfacing fixed ball valve according to claim 8, wherein: At least two second sealing rings (31) for forming a sealing fit with the inner circular surface of the chute (27) are installed on the outer circumference of the valve seat body (6).

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