Side-mounted double-seal floating ball valve

Abstract

The utility model relates to the technical field of ball valves, and discloses a side-mounted double-seal floating ball valve which comprises a valve cover and a valve body, the valve cover and the valve body are fixedly connected through a bolt, a ball body is arranged in the middle of the close side of the valve cover and the valve body, a valve rod is installed on the top of the ball body, springs are arranged on the close side of the valve cover and the valve body, and the valve cover and the valve body are connected through bolts. Top blocks are arranged on the close sides of the springs on the two sides, second sealing rings are fixedly connected to the middles of the top blocks on the two sides, and first sealing rings are fixedly connected to the close sides of the top blocks on the two sides. According to the ball sealing device, the ejector block can be ejected out through the spring, and then the first sealing ring can be ejected out to be pressed on the outer side of the ball body, so that the two sides of the ball body can be sealed at the same time, and after the first sealing ring is abraded and consumed, the ejector block and the second sealing ring can continue to seal the ball body under the action of the spring; and the phenomenon that the ball valve loses the sealing effect after the first sealing ring is worn out is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a side-mounted double-seal floating ball valve. Background Art

[0002] Side mounted double seal floating ball valve is a kind of valve used to start, stop or regulate the flow of fluid through the pipeline. It is suitable for oil, gas, chemical, pharmaceutical, electric power and other industries. It can be used for different types of fluids such as water, oil, steam, acidic or alkaline media. At the same time, the double sealing system greatly reduces the risk of leakage.

[0003] However, it is found in the use of the existing side-mounted double-seal floating ball valve that the sealing rings on both sides will inevitably wear out after long-term use. When the sealing rings are worn out, the sealing function will be lost, and the medium pressure in the pipeline will leak. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a side-mounted double-seal floating ball valve, which aims to improve the problem that after the sealing ring is worn out, the sealing function will be lost and the medium pressure in the pipeline will leak.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a side-mounted double-seal floating ball valve, comprising a valve cover and a valve body, the valve cover and the valve body are fixedly connected by bolts, a ball is arranged in the middle of the adjacent sides of the valve cover and the valve body, a valve stem is installed on the top of the ball, springs are arranged on the adjacent sides of the valve cover and the valve body, top blocks are arranged on the adjacent sides of the springs on both sides, the middle parts of the top blocks on both sides are fixedly connected with a second sealing ring, and the adjacent sides of the top blocks on both sides are fixedly connected with a first sealing ring.

[0006] As a further description of the above technical solution:

[0007] An antistatic spring is arranged at the inner bottom of the valve stem, an antistatic ball is arranged on one side of the antistatic spring, and one side of the antistatic ball is in contact with the top of the sphere.

[0008] As a further description of the above technical solution:

[0009] The second sealing ring is made of fluororubber, and the first sealing ring is made of polytetrafluoroethylene.

[0010] As a further description of the above technical solution:

[0011] A packing is arranged at the middle and upper part of the valve body, a gland flange is fixedly connected to the middle part of the top surface of the valve body, and the valve stem passes through the packing and the gland flange.

[0012] As a further description of the above technical solution:

[0013] A bracket is fixedly connected to the outer side of the middle part of the top surface of the valve body, a gear box is fixedly connected to the top of the bracket, a hand wheel is arranged on one side of the gear box, and the bottom of the gear box is connected to the top of the valve stem.

[0014] As a further description of the above technical solution:

[0015] A thrust washer is arranged in the middle of the valve body, and the lower end of the valve stem is located below the thrust washer.

[0016] The utility model has the following beneficial effects:

[0017] In the utility model, the top block can be pushed out by utilizing the spring, and then the first sealing ring can be pushed out to press it against the outside of the sphere, so both sides of the sphere can be sealed at the same time, and after the first sealing ring is worn and consumed, the top block and the second sealing ring can continue to seal the sphere under the action of the spring, avoiding the ball valve from losing its sealing effect due to the first sealing ring being worn out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front cross-sectional view of the side-mounted double-seal floating ball valve proposed by the utility model;

[0019] Figure 2 for Figure 1 A in the enlarged view;

[0020] Figure 3 for Figure 1 The enlarged view of point B in the figure;

[0021] Figure 4 This is a schematic diagram of the valve stem structure of the side-mounted double-seal floating ball valve proposed by the utility model;

[0022] Figure 5 The utility model is a side view of the valve stem of the side-mounted double-seal floating ball valve.

[0023] Legend:

[0024] 1. Valve cover; 2. Bolts; 3. Ball; 4. Valve body; 5. Spring; 6. Top block; 7. Second sealing ring; 8. First sealing ring; 9. Anti-static spring; 10. Anti-static ball; 11. Valve stem; 12. Packing; 13. Gland flange; 14. Bracket; 15. Gear box; 16. Handwheel; 17. Thrust washer. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the specification of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Reference Figure 1 and Figure 3 The utility model provides an embodiment: a side-mounted double-seal floating ball valve, including a valve cover 1 and a valve body 4, the valve cover 1 and the valve body 4 are fixedly connected by bolts 2, a ball 3 is arranged in the middle of the adjacent sides of the valve cover 1 and the valve body 4, a valve stem 11 is installed on the top of the ball 3, springs 5 ​​are arranged on the adjacent sides of the valve cover 1 and the valve body 4, top blocks 6 are arranged on the adjacent sides of the springs 5 ​​on both sides, second sealing rings 7 are fixedly connected in the middle of the top blocks 6 on both sides, and first sealing rings 8 are fixedly connected to the adjacent sides of the top blocks 6 on both sides. The top block 6 can be pushed out by the spring 5, and then the top block 6 can be used to push the first sealing ring 8 to move, so that the first sealing ring 8 is pressed against the outside of the ball 3, thereby achieving a sealing effect. The spring 5, the top block 6 and the first sealing ring 8 are arranged on the adjacent sides of the valve cover 1 and the valve body 4, so that the effect of sealing both sides of the ball 3 can be achieved to avoid leakage of the circulating medium. After long-term use, wear and tear will inevitably occur between the first sealing ring 8 and the ball 3. Therefore, when the first sealing ring 8 is exhausted, the elastic force of the spring 5 can make the top block 6 and the second sealing ring 7 contact with the ball 3. At this time, the second sealing ring 7 can continue to maintain the sealing state of the ball valve to avoid leakage of the medium.

[0027] Reference Figure 1 Figure and Figure 4 The inner bottom of the valve stem 11 is provided with an antistatic spring 9, and one side of the antistatic spring 9 is provided with an antistatic ball 10, and one side of the antistatic ball 10 is in contact with the top of the ball 3. Through the cooperation of the antistatic spring 9 and the antistatic ball 10, when the valve seat is burned, the ball 3 can directly contact the metal surface on the valve body 4, thereby preventing a large amount of medium from leaking from the burned valve seat.

[0028] Reference Figure 1 and Figure 3, the second sealing ring 7 is set to be made of fluororubber material, and the first sealing ring 8 is set to be made of polytetrafluoroethylene material. By utilizing the excellent chemical resistance and low friction coefficient of polytetrafluoroethylene material, the chemical stability of the first sealing ring 8 can be improved, and the friction between the first sealing ring 8 and the ball 3 can be reduced, thereby avoiding excessive wear between the first sealing ring 8 and the ball 3. By utilizing the elasticity and flexibility of the fluororubber material, the second sealing ring 7 can be attached to the outside of the ball 3 to maintain the sealing state, and the fluororubber material has excellent heat resistance, oil resistance and chemical resistance, so the stability of the second sealing ring 7 can be greatly improved.

[0029] Reference Figure 1 and Figure 2 and Figure 5 A packing 12 is provided in the middle and upper part of the valve body 4, a gland flange 13 is fixedly connected to the middle of the top surface of the valve body 4, and the valve stem 11 passes through the packing 12 and the gland flange 13. A bracket 14 is fixedly connected to the outer middle of the top surface of the valve body 4, a gear box 15 is fixedly connected to the top of the bracket 14, a hand wheel 16 is provided on one side of the gear box 15, and the bottom of the gear box 15 is connected to the top of the valve stem 11. A thrust washer 17 is provided in the middle of the valve body 4, and the bottom end of the valve stem 11 is below the thrust washer 17. By rotating the hand wheel 16, the hand wheel 16 drives the gear box 15 to operate, and then the gear box 15 can drive the valve stem 11 to rotate. At this time, the valve stem 11 can drive the ball 3 to rotate, so as to control the opening and closing of the ball valve. At the same time, when the medium passes through the valve, the pressure in the cavity of the valve body 4 may push the valve stem 11 out. At this time, the valve stem 11 is restricted by the thrust washer 17. In this way, even if the packing 12 and the thrust bearing are burned or the packing 12 is damaged due to fire or other reasons, the medium pressure in the valve body 4 will make the flange of the valve stem 11 closely contact with the sealing surface on the valve body 4, so as to prevent a large amount of medium from leaking from the damaged packing 12.

[0030] Working principle: When in use, after the ball valve is connected to the pipeline, the hand wheel 16 is rotated to drive the gear box 15 to operate, and then the gear box 15 can be used to drive the valve stem 11 to rotate, and then the valve stem 11 can be used to drive the ball 3 to rotate, so as to control the opening and closing of the ball valve. In the process of use, the top block 6 can be pushed out by the spring 5, and then the top block 6 can be used to push the first sealing ring 8 to move, so that the first sealing ring 8 is pressed against the outside of the ball 3, thereby achieving a sealing effect, and between the valve cover 1 and the valve body 4 The spring 5, the top block 6 and the first sealing ring 8 are arranged on the adjacent sides of the sphere 3, so that the effect of sealing both sides of the sphere 3 can be achieved to avoid leakage of the circulating medium. At the same time, the first sealing ring 8 is set to be a polytetrafluoroethylene material. The excellent chemical resistance and low friction coefficient of the polytetrafluoroethylene material can improve the chemical stability of the first sealing ring 8, and at the same time, the friction between the first sealing ring 8 and the sphere 3 can be reduced to avoid excessive wear between the first sealing ring 8 and the sphere 3. After long-term use, the first sealing ring 8 Wear and tear will inevitably occur between the ring 8 and the ball 3. Therefore, when the first sealing ring 8 is exhausted, the elastic force of the spring 5 can make the top block 6 and the second sealing ring 7 contact the ball 3. By setting the second sealing ring 7 to be made of fluororubber material, the elasticity and flexibility of the fluororubber material can be used to make the second sealing ring 7 fit the outside of the ball 3, thereby maintaining the sealing state. In addition, the fluororubber material has excellent heat resistance, oil resistance and chemical resistance, so the stability of the second sealing ring 7 can be greatly improved. At the same time, when the medium passes through the valve, the pressure in the cavity of the valve body 4 can be The valve stem 11 can be pushed out, and at this time, the valve stem 11 is restricted by the thrust washer 17. In this way, even if the packing 12 and the thrust bearing are burned or the packing 12 is damaged due to other reasons during a fire, the medium pressure in the valve body 4 will make the flange of the valve stem 11 in close contact with the sealing surface on the valve body 4, preventing a large amount of medium from leaking from the damaged packing 12. In addition, through the cooperation of the anti-static spring 9 and the anti-static ball 10, when the valve seat is burned, the ball 3 can directly contact the metal surface on the valve body 4, thereby preventing a large amount of medium from leaking from the burned valve seat.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A side-mounted double-seal floating ball valve, comprising a valve cover (1) and a valve body (4), characterized in that: The valve cover (1) and the valve body (4) are fixedly connected by bolts (2); a ball (3) is arranged in the middle of the adjacent sides of the valve cover (1) and the valve body (4); a valve stem (11) is installed on the top of the ball (3); springs (5) are arranged on the adjacent sides of the valve cover (1) and the valve body (4); top blocks (6) are arranged on the adjacent sides of the springs (5) on both sides; a second sealing ring (7) is fixedly connected to the middle of the top blocks (6) on both sides; and a first sealing ring (8) is fixedly connected to the adjacent sides of the top blocks (6) on both sides.

2. The side-mounted double-seal floating ball valve according to claim 1 is characterized in that: An antistatic spring (9) is arranged at the inner bottom of the valve stem (11), an antistatic ball (10) is arranged on one side of the antistatic spring (9), and one side of the antistatic ball (10) is in contact with the top of the sphere (3).

3. The side-mounted double-seal floating ball valve according to claim 1 is characterized in that: The second sealing ring (7) is made of fluororubber, and the first sealing ring (8) is made of polytetrafluoroethylene.

4. The side-mounted double-seal floating ball valve according to claim 1 is characterized in that: A packing (12) is arranged at the middle upper part of the valve body (4), a gland flange (13) is fixedly connected to the middle part of the top surface of the valve body (4), and the valve stem (11) passes through the packing (12) and the gland flange (13).

5. The side-mounted double-seal floating ball valve according to claim 1 is characterized in that: A bracket (14) is fixedly connected to the outer middle part of the top surface of the valve body (4), a gear box (15) is fixedly connected to the top of the bracket (14), a hand wheel (16) is provided on one side of the gear box (15), and the bottom of the gear box (15) is connected to the top of the valve stem (11).

6. The side-mounted double-seal floating ball valve according to claim 1, characterized in that: A thrust washer (17) is provided in the middle of the valve body (4), and the lower end of the valve stem (11) is located below the thrust washer (17).

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