Top-mounted ball valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a top-mounted ball valve. Comprising a valve body, a valve seat, a valve ball, a valve rod and a valve cover, and further comprises two annular cavities arranged in the valve body and located on the side, away from the valve ball, of the valve seat; the elastic piece is arranged in the annular cavity and axially abuts against the valve seat; the upper wear-resistant positioning piece is arranged between the valve ball and the valve cover; the lower wear-resistant positioning piece is arranged between the valve ball and the valve body; the valve seat tightly abuts against the surface of the valve ball through bounce of the elastic piece, the sealing performance between the valve ball and the valve seat is improved, the upper wear-resisting positioning piece and the lower wear-resisting positioning piece can prevent the valve ball and the valve body from generating a gap due to mutual friction, then the valve ball is prevented from shaking in the valve body due to medium impact, and the stability of the valve ball is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a top-mounted ball valve. Background Art

[0002] Ball valves have become one of the most widely used valves due to their reliable sealing, simple structure and easy maintenance. Top-mounted ball valves have the advantages of fewer leakage points and less influence of pipeline stress on them compared to side-mounted ball valves. When the demand takes into account the online maintenance function and the use in pipelines that require the ball valve to resist end loads, top-mounted ball valves are needed.

[0003] In the prior art, the friction between the valve ball and the valve seat is caused by rotation, and the impurity particles in the medium are easy to wear the valve seat, reducing the service life of the valve seat and affecting the sealing effect of the valve seat. In addition, the friction between the valve ball and the valve body is easy to wear and produce gaps over time. When the valve ball is impacted by the high-pressure medium, the valve ball is easy to shake and deviate slightly, resulting in a weakened sealing between the valve ball and the valve seat, causing medium leakage. Utility Model Content

[0004] The purpose of the utility model is to provide a top-mounted ball valve in view of the above-mentioned technical problems. Through the rebound force of the elastic member, the valve seat is tightly pressed against the surface of the valve ball, thereby improving the sealing between the valve ball and the valve seat. The upper wear-resistant positioning member and the lower wear-resistant positioning member can prevent the mutual friction between the valve ball and the valve body to produce a gap, thereby preventing the valve ball from shaking in the valve body due to the impact of the medium, thereby improving the stability of the valve ball.

[0005] In view of this, the utility model provides a top mounted ball valve, comprising: a valve body, a valve seat, a valve ball, a valve stem and a valve cover, wherein the top of the valve body is provided with a through hole for placing the valve ball, the valve cover is mounted on the top of the through hole, the valve seat and the valve ball are both mounted in the valve body, there are two valve seats and they respectively abut on the two ends of the valve ball, the valve stem passes through the valve cover and is connected to the valve ball, and further comprises:

[0006] An annular cavity, the number of which is two, which is arranged in the valve body, and the annular cavity is located on the side of the valve seat away from the valve ball;

[0007] An elastic member, disposed in the annular cavity and axially abutting against the valve seat;

[0008] An upper wear-resistant positioning member is arranged between the valve ball and the valve cover;

[0009] The lower wear-resistant positioning piece is arranged between the valve ball and the valve body.

[0010] In the above solution, further, a positioning protrusion is provided at the upper and lower ends of the valve ball respectively;

[0011] The positioning protrusion at the upper end is adapted to abut against the upper wear-resistant positioning piece, and the positioning protrusion at the lower end is adapted to abut against the lower wear-resistant positioning piece.

[0012] In the above scheme, further, the upper wear-resistant positioning member and the lower wear-resistant positioning member are both annular structures with L-shaped cross-sections, and both the upper wear-resistant positioning member and the lower wear-resistant positioning member include a first positioning member abutting against the end face of the positioning protrusion and a second positioning member abutting against the outer peripheral surface of the positioning protrusion.

[0013] In the above solution, further, the annular cavity includes an inner cavity wall, and the inner cavity wall is radially abutted against the valve seat.

[0014] In the above scheme, further comprising:

[0015] The retaining ring is arranged between the elastic member and the valve seat, and two sides of the retaining ring are respectively in contact with the elastic member and the valve seat.

[0016] In the above solution, further, the elastic member is a spring.

[0017] In the above solution, further, the valve cover and the valve body are connected by bolts.

[0018] In the above scheme, further, a limiting groove is provided at the bottom of the valve cover, and a protrusion matching the limiting groove is provided on the valve stem, the limiting groove and the protrusion are in conflict with each other, and the lower end surface of the protrusion is in conflict with the upper end surface of the positioning protrusion at the top of the valve ball.

[0019] In the above solution, further, the upper wear-resistant positioning part and the lower positioning wear-resistant part are both made of ceramic.

[0020] The beneficial effects of the utility model are:

[0021] 1. Through the rebound force of the elastic part, the valve seat is tightly pressed against the surface of the valve ball, improving the sealing between the valve ball and the valve seat. The upper wear-resistant positioning part and the lower wear-resistant positioning part can prevent the friction between the valve ball and the valve body from causing a gap, thereby preventing the valve ball from shaking in the valve body due to the impact of the medium, and improving the stability of the valve ball;

[0022] 2. The retaining ring blocks the direct contact between the elastic part and the valve seat to avoid mutual wear between the elastic part and the valve seat. The resilience of the elastic part can be evenly distributed on the valve seat through the retaining ring. The existence of the retaining ring can effectively support and maintain the shape of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0024] Figure 2 The utility model Figure 1 A schematic diagram of the structure at A;

[0025] Figure 3 It is a structural schematic diagram of the upper wear-resistant positioning member of the utility model.

[0026] The symbols in the figure are:

[0027] 1. Valve body; 2. Valve seat; 3. Valve ball; 4. Valve stem; 5. Valve cover; 6. Annular cavity; 7. Elastic member; 8. Upper wear-resistant positioning member; 9. Lower wear-resistant positioning member; 10. Positioning convex portion; 11. First positioning portion; 12. Second positioning portion; 13. Inner cavity wall; 14. Retaining ring; 15. Limiting groove; 16. Protrusion. DETAILED DESCRIPTION

[0028] 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, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0029] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment 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, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. 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 subsequent drawings.

[0030] Embodiment 1:

[0031] This embodiment provides a top mounted ball valve, comprising: a valve body 1, a valve seat 2, a valve ball 3, a valve stem 4 and a valve cover 5. The top of the valve body 1 is provided with a through hole for placing the valve ball 3, the valve cover 5 is installed on the top of the through hole, the valve seat 2 and the valve ball 3 are both installed in the valve body 1, there are two valve seats 2 and they are respectively against the two ends of the valve ball 3, the valve stem 4 passes through the valve cover 5 and is connected to the valve ball 3, and also includes:

[0032] annular cavity 6, the number of the annular cavity 6 is two, the annular cavity 6 is arranged in the valve body 1, and the annular cavity 6 is located on the side of the valve seat 2 away from the valve ball 3;

[0033] The elastic member 7 is arranged in the annular cavity 6 and axially abuts against the valve seat 2;

[0034] The upper wear-resistant positioning member 8 is arranged between the valve ball 3 and the valve cover 5;

[0035] The lower wear-resistant positioning member 9 is arranged between the valve ball 3 and the valve body 1 .

[0036] In the present technical solution, the valve cover 5 is installed on the top of the valve body 1, which facilitates installation, disassembly and maintenance.

[0037] The valve seat 2 is used to seal between the valve ball 3 and the valve body 1 to prevent leakage of the medium. The valve seat 2 can be made of polytetrafluoroethylene. Polytetrafluoroethylene has excellent heat resistance and cold resistance, and has non-stickiness, good self-lubrication and low friction coefficient. It can also withstand concentrated acids, concentrated alkalis, strong oxidants and any concentration of boiling hydrofluoric acid and other media.

[0038] The annular cavity 6 includes a first cavity for installing the elastic member 7 and a second cavity for installing the valve seat 2. At the same time, a step surface is formed between the first cavity and the second cavity, and the valve seat 2 abuts against the step surface to prevent the elastic member 7 from being over-compressed and damaged.

[0039] The elastic member 7 is elastic and can be compressed when subjected to external force, so that its length changes and it has a resilience. The elastic member 7 can be made of metal, such as stainless steel, which is more durable.

[0040] After the elastic member 7, the valve seat 2 and the valve ball 3 are installed in sequence, the elastic member 7 is squeezed by the valve ball 3 and thus compressed and deformed. The rebound force generated by the elastic member 7 causes the valve seat 2 to tightly contact the valve ball 3, thereby improving the sealing between the valve ball 3 and the valve seat 2 and avoiding leakage of the medium.

[0041] When the surface of the valve seat 2 is worn, the valve seat 2 can still be in close contact with the valve ball 3 due to the rebound force of the elastic member 7, thereby ensuring the sealing effect and increasing the service life of the valve seat 2.

[0042] The upper wear-resistant positioning member 8 and the lower wear-resistant positioning member 9 are both annular in structure and are made of wear-resistant material, such as ceramic and alloy.

[0043] There is a gap between the valve ball 3 and the valve cover 5, and the valve ball 3 and the valve cover 5 are not in direct contact. The upper wear-resistant positioning piece 8 is arranged between the valve ball 3 and the valve cover 5, and rotates relative to the valve ball 3. The upper wear-resistant positioning piece 8 is made of wear-resistant material to avoid mutual friction between the valve ball 3 and the upper wear-resistant positioning piece 8 to produce wear and form a gap, which causes the valve ball 3 to shake and deviate in the valve body 1 due to the impact of the medium, affecting the stability of the valve ball 3 and thus affecting the sealing of the valve.

[0044] The upper wear-resistant positioning member 8 reduces the contact area with the valve ball 3 , thereby reducing the friction force when the valve ball 3 rotates, thereby saving more effort when rotating the valve stem 4 .

[0045] There is a gap between the valve ball 3 and the valve body 1, and the valve ball 3 and the valve body 1 are not in direct contact. The lower wear-resistant positioning member 9 is arranged between the valve ball 3 and the valve body 1, and the lower wear-resistant positioning member 9 and the valve ball 3 rotate relative to each other. The lower wear-resistant positioning member 9 can reduce the friction force when the valve ball 3 rotates, thereby making it easier to rotate the valve stem 4.

[0046] The lower wear-resistant positioning piece 9 is made of wear-resistant material to prevent the valve ball 3 and the lower wear-resistant positioning piece 9 from rubbing against each other to produce wear and form a gap, which would cause the valve ball 3 to shake and deviate in the valve body 1 due to the impact of the medium, affecting the stability of the valve ball 3 and thus affecting the sealing of the valve.

[0047] Furthermore, a positioning protrusion 10 is provided at the upper and lower ends of the valve ball 3;

[0048] The upper positioning protrusion 10 is adapted to abut against the upper wear-resistant positioning piece 8 , and the lower positioning protrusion 10 is adapted to abut against the lower wear-resistant positioning piece 9 .

[0049] In the present technical solution, the positioning protrusion 10 can be disc-shaped or annular, and the upper wear-resistant positioning member 8 and the lower wear-resistant positioning member 9 are both provided with positioning grooves adapted to the positioning protrusion 10 . The positioning protrusion 10 is used to position the valve ball 3 to further improve the stability of the valve ball 3 .

[0050] Furthermore, the upper wear-resistant positioning member 8 and the lower wear-resistant positioning member 9 are both annular structures with L-shaped cross-sections. The upper wear-resistant positioning member 8 and the lower wear-resistant positioning member 9 both include a first positioning portion 11 abutting against the end face of the positioning protrusion 10 and a second positioning portion 12 abutting against the outer peripheral surface of the positioning protrusion 10.

[0051] In the present technical solution, an annular groove matching the positioning protrusion 10 is formed on the upper wear-resistant positioning member 8 and the lower wear-resistant positioning member 9. The L-shaped cross-section design makes the upper wear-resistant positioning member 8 and the lower wear-resistant positioning member 9 more resistant to deformation when subjected to pressure, and will not be offset due to pressure, while ensuring that the upper wear-resistant positioning member 8 and the lower wear-resistant positioning member 9 can fit the positioning protrusion tightly, thereby improving the sealing performance of the valve ball 3.

[0052] Furthermore, the elastic member 7 is a spring.

[0053] In this technical solution, the spring has a simple structure, durable materials, long service life, easy installation and low maintenance cost, thereby reducing the cost of the top-mounted ball valve and is suitable for the use of the top-mounted ball valve.

[0054] Furthermore, the upper wear-resistant positioning member 8 and the lower positioning wear-resistant member are both made of ceramic.

[0055] In the present technical solution, ceramic is a wear-resistant material with high hardness and wear resistance, which can effectively resist friction and wear and extend the service life of the valve.

[0056] Embodiment 2:

[0057] This embodiment provides a top-mounted ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0058] The annular cavity 6 includes an inner cavity wall 13 , and the inner cavity wall 13 is in radial contact with the valve seat 2 .

[0059] In this technical solution, the annular cavity 6 includes a first cavity for installing the elastic member 7 and a second cavity for installing the valve seat 2. The inner cavity wall 13 is located on the second cavity. The inner cavity wall 13 ensures close contact between the annular cavity 6 and the valve seat 2, reducing the possibility of medium leakage.

[0060] Embodiment 3:

[0061] This embodiment provides a top-mounted ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0062] Also includes:

[0063] The retaining ring 14 is disposed between the elastic member 7 and the valve seat 2 , and two sides of the retaining ring 14 are respectively in contact with the elastic member 7 and the valve seat 2 .

[0064] In the present technical solution, the retaining ring 14 can be made of a hard material, such as stainless steel, and blocks the elastic member 7 from directly contacting the valve seat 2 to prevent the elastic member 7 and the valve seat 2 from wearing each other.

[0065] The resilience of the elastic member 7 can be evenly distributed on the valve seat 2 through the retaining ring 14. The existence of the hard retaining ring 14 can effectively support and maintain the shape of the sealing ring.

[0066] Embodiment 4:

[0067] This embodiment provides a top-mounted ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0068] The valve cover 5 is connected to the valve body 1 by bolts.

[0069] In the present technical solution, the valve cover 5 and the valve body 1 are connected by bolts, which not only enhances the overall structural stability of the top-mounted ball valve, reduces loosening or damage caused by vibration or impact of the medium, but also facilitates installation, disassembly and maintenance.

[0070] Embodiment 5:

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

[0072] The bottom of the valve cover 5 is provided with a limiting groove 15, and the valve stem 4 is provided with a protrusion 16 matching the limiting groove 15. The limiting groove 15 and the protrusion 16 are in conflict with each other, and the lower end surface of the protrusion 16 is in conflict with the upper end surface of the positioning protrusion 10 at the top of the valve ball 3.

[0073] In the present technical solution, the limiting groove 15 and the protrusion 16 cooperate with each other to limit the valve stem 4, ensuring that the valve stem 4 will not slide out of the valve cover 5, thereby enhancing the overall structural stability of the top-mounted ball valve.

[0074] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in 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 top mounted ball valve, comprising: A valve body (1), a valve seat (2), a valve ball (3), a valve stem (4) and a valve cover (5), wherein a through hole for inserting the valve ball (3) is provided at the top of the valve body (1), the valve cover (5) is mounted on the top of the through hole, the valve seat (2) and the valve ball (3) are both mounted in the valve body (1), there are two valve seats (2) and they respectively abut against the two ends of the valve ball (3), the valve stem (4) passes through the valve cover (5) and is connected to the valve ball (3), and is characterized in that it also includes: annular cavities (6), the number of the annular cavities (6) being two, the annular cavities (6) being arranged in the valve body (1), and the annular cavities (6) being located on a side of the valve seat (2) away from the valve ball (3); An elastic member (7) is disposed in the annular cavity (6) and is axially abutted against the valve seat (2); An upper wear-resistant positioning member (8) is arranged between the valve ball (3) and the valve cover (5); The lower wear-resistant positioning member (9) is arranged between the valve ball (3) and the valve body (1).

2. The top-entry ball valve according to claim 1, characterized in that: The valve ball (3) is provided with a positioning protrusion (10) at the upper and lower ends respectively; The positioning protrusion (10) at the upper end is adapted to abut against the upper wear-resistant positioning piece (8), and the positioning protrusion (10) at the lower end is adapted to abut against the lower wear-resistant positioning piece (9).

3. The top-entry ball valve according to claim 2, characterized in that: The upper wear-resistant positioning member (8) and the lower wear-resistant positioning member (9) are both annular structures with L-shaped cross-sections. The upper wear-resistant positioning member (8) and the lower wear-resistant positioning member (9) both include a first positioning portion (11) abutting against the end surface of the positioning protrusion (10) and a second positioning portion (12) abutting against the outer peripheral surface of the positioning protrusion (10).

4. The top-entry ball valve according to claim 1, characterized in that: The annular cavity (6) comprises an inner cavity wall (13), and the inner cavity wall (13) is radially in contact with the valve seat (2).

5. The top-entry ball valve according to claim 1, characterized in that: Also includes: The retaining ring (14) is arranged between the elastic member (7) and the valve seat (2), and two sides of the retaining ring (14) respectively abut against the elastic member (7) and the valve seat (2).

6. The top-entry ball valve according to claim 1, characterized in that: The elastic member (7) is a spring.

7. The top-entry ball valve according to claim 1, characterized in that: The valve cover (5) and the valve body (1) are connected by bolts.

8. The top-entry ball valve according to claim 1, characterized in that: The bottom of the valve cover (5) is provided with a limiting groove (15), and the valve stem (4) is provided with a protrusion (16) matching the limiting groove (15). The limiting groove (15) and the protrusion (16) are in contact with each other, and the lower end surface of the protrusion (16) is in contact with the upper end surface of the positioning protrusion (10) at the top end of the valve ball (3).

9. The top-entry ball valve according to claim 1, characterized in that: The upper wear-resistant positioning piece (8) and the lower wear-resistant positioning piece (9) are both made of ceramic.

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