Soft seal ball valve

Abstract

The utility model discloses a soft sealing ball valve, which relates to the technical field of valves, and comprises a valve body and a valve seat, the valve body is provided with a medium channel, a valve rod is arranged in the valve body, the lower end of the valve rod is connected with a ball body, the upper end of the valve rod penetrates out of the valve body to be connected with an actuating mechanism, the ball body is provided with a ball body channel and a sealing surface, and the sealing surface is provided with a sealing surface. The end of the valve seat can be in sealing fit with the sealing face, the valve seat is of an elastic structure, a limiting groove is formed in the side, close to the ball body, of the valve seat, the ball body is provided with an annular protrusion corresponding to the limiting groove, and the annular protrusion is in interference fit with the limiting groove. When the valve is used under the low-temperature working condition, the limiting groove can clamp the annular protrusion, sealing leakage cannot be caused, and the sealing reliability of the valve is guaranteed.

Description

Technical Field

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

[0002] The plug body of the ball valve is a sphere with a circular through hole or channel passing through its axis. It is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. When in use, it only needs to be rotated 90 degrees and a very small torque to close tightly. Due to its small flow resistance, rapid switching, good sealing performance, and long service life, it has a wide range of applications. When the commonly used ball valve is used in low temperature conditions, there will be a certain gap between the ball and the valve seat due to the characteristics of thermal expansion and contraction, which is easy to cause sealing leakage and reduce the sealing reliability. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides a soft-sealed ball valve.

[0004] The technical solution provided by the utility model is:

[0005] A soft-sealed ball valve comprises a valve body and a valve seat. The valve body is provided with a medium channel. The valve body is provided with a valve stem. The lower end of the valve stem is connected to a ball. The upper end of the valve stem passes through the valve body and is connected to an actuator. The ball is provided with a ball channel and a sealing surface. The end of the valve seat and the sealing surface can form a sealing fit. The valve seat is an elastic structure. The valve seat is provided with a limiting groove close to the ball side. The ball is provided with an annular protrusion corresponding to the limiting groove. The annular protrusion and the limiting groove form an interference fit.

[0006] The limiting groove is in a trumpet-shaped structure with a small outside and a large inside. When the annular protrusion is limited in the limiting groove, the limiting groove will be elastically deformed to clamp the annular protrusion.

[0007] The annular protrusion is in the shape of an arc protruding outwards.

[0008] The outer side of the valve seat away from the sphere is concave to form a lip-shaped structure, and the valve body is provided with a through hole connecting the lip-shaped structure and the medium channel.

[0009] The valve body comprises a left valve body and a right valve body, and the left valve body and the right valve body are detachably connected via bolts.

[0010] An antistatic mechanism is provided between the valve stem and the sphere, and the antistatic mechanism comprises an antistatic steel ball and an antistatic spring, one end of the antistatic spring abuts against the valve stem, one end of the antistatic steel ball abuts against the sphere, and the antistatic spring is in contact with the antistatic steel ball.

[0011] A packing assembly is provided between the valve stem and the valve body. The packing assembly comprises packing, a packing gland and a packing pressure plate. The packing pressure plate presses the packing gland to thereby press the packing.

[0012] A grease injection nozzle is provided above the valve stem, a first O-ring and a second O-ring are provided between the valve stem and the valve body, a grease injection hole is provided between the first O-ring and the second O-ring, and the grease injection hole is communicated with the grease injection nozzle.

[0013] The beneficial effects of the utility model are as follows: the utility model adopts a new sealing structure to set the valve seat as an elastic structure; a limiting groove is provided on the valve seat close to the sphere side; the sphere is provided with an annular protrusion corresponding to the limiting groove; the annular protrusion and the limiting groove form an interference fit; when used under low temperature conditions, the limiting groove can clamp the annular protrusion without causing sealing leakage, thereby ensuring the reliability of the valve sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0015] Figure 2 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0016] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0017] like Figure 1-2 As shown, a soft-sealed ball valve comprises a valve body 1 and a valve seat 4. The valve body 1 comprises a left valve body 11 and a right valve body 12. The left valve body 11 and the right valve body 12 are detachably connected by bolts 13, which are convenient for assembly and subsequent disassembly and maintenance. The valve body 1 is provided with a medium channel 14. A valve stem 2 is arranged in the valve body 1. The lower end of the valve stem 2 is connected to a ball 3. The upper end of the valve stem 2 passes through the valve body 1 and is connected to an actuator 9. A ball channel and a sealing surface are arranged on the ball 3. The end of the valve seat and the sealing surface can form a sealing fit. The valve seat 4 is an elastic structure. A limiting groove 41 is arranged on the side of the valve seat 4 close to the ball 3. The limiting groove 41 is a trumpet-shaped structure with a small outer side and a large inner side. The ball 3 is provided with an annular protrusion 31 corresponding to the limiting groove 41. During assembly, when the annular protrusion 31 is limited in the limiting groove 41, the opening of the limiting groove will be enlarged and elastically deformed, thereby clamping the annular protrusion 31 to form an interference fit. This structure has a good sealing effect, no sealing leakage will occur, and the reliability of the valve sealing is guaranteed.

[0018] The annular protrusion 31 is in the shape of an arc protruding outward. The arc-shaped structure reduces the friction between the annular protrusion 31 and the limiting groove 41 of the valve seat 4 when the valve is opened and closed, thereby reducing the valve opening and closing torque.

[0019] The outer side of the valve seat 4 away from the sphere is concave to form a lip structure 42. The valve body 1 is provided with a through hole 5 connecting the lip structure 42 and the medium channel 14. When the valve is opened, the medium impacts the lip structure 42 through the through hole 5, pushing the sealing ring 5 to deform, similar to the piston effect, so that the valve seat 4 is more tightly in contact with the annular protrusion 31 to prevent leakage and improve the sealing performance.

[0020] An antistatic mechanism is provided between the valve stem 2 and the ball 3, and the antistatic mechanism includes an antistatic steel ball 51 and an antistatic spring 52. One end of the antistatic spring 52 is against the valve stem 2, and one end of the antistatic steel ball 51 is against the ball 3. The antistatic spring 52 is in contact with the antistatic steel ball 51. The static electricity on the valve seat 4 is introduced into the ball 4, and is transferred to the valve stem 2 through the antistatic spring 52 and the antistatic steel ball 51. The valve stem 2 then transfers the static electricity to the valve body 1, and the valve body 1 then transfers the static electricity to the pipeline or ground wire on site, so that grounding can be achieved, thereby improving the safety factor.

[0021] A packing assembly is provided between the valve stem 2 and the valve body 1, and the packing assembly includes a packing 6, a packing gland 7, and a packing pressure plate 8. The packing pressure plate 8 compresses the packing 6 by pressing the packing gland 7. The packing 6 prevents leakage between the valve stem 2 and the valve body 1, thereby ensuring the reliability of the valve seal. The valve is used on the pipeline for a long time, and the valve is frequently opened and closed. The packing 6 is easily damaged and leaks out. In order to provide emergency sealing measures when the valve stem 2 and the valve body 1 leak out, a grease injection nozzle 10 is provided above the valve stem, and a first O-ring 21 and a second O-ring 22 are provided between the valve stem 2 and the valve body 1. A grease injection hole 23 is provided between the first O-ring 21 and the second O-ring 22, and the grease injection hole 23 is communicated with the grease injection nozzle 10. When the valve stem leaks out, the grease injection nozzle 10 at the top of the valve stem 2 can be used to inject sealing oil into the grease injection hole 23 of the valve stem 2, which can play the role of emergency sealing and lubricating the valve stem, thereby reducing the friction of the valve stem.

[0022] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A soft-sealed ball valve, comprising a valve body and a valve seat, wherein the valve body is provided with a medium channel, the valve body is provided with a valve stem, the lower end of the valve stem is connected to a ball, the upper end of the valve stem passes through the valve body and is connected to an actuator, the ball is provided with a ball channel and a sealing surface, the end of the valve seat and the sealing surface can form a sealing fit, characterized in that: The valve seat is an elastic structure. The valve seat is provided with a limiting groove near the spherical body. The spherical body is provided with an annular protrusion corresponding to the limiting groove. The annular protrusion and the limiting groove form an interference fit.

2. A soft-sealed ball valve according to claim 1, characterized in that: The limiting groove is in a trumpet-shaped structure with a small outside and a large inside. When the annular protrusion is limited in the limiting groove, the limiting groove will be elastically deformed to clamp the annular protrusion.

3. A soft-sealed ball valve according to claim 2, characterized in that: The annular protrusion is in the shape of an arc protruding outwards.

4. A soft-sealed ball valve according to claim 1, characterized in that: The outer side of the valve seat away from the sphere is concave to form a lip-shaped structure, and the valve body is provided with a through hole connecting the lip-shaped structure and the medium channel.

5. The soft-sealed ball valve according to claim 1, characterized in that: The valve body comprises a left valve body and a right valve body, and the left valve body and the right valve body are detachably connected via bolts.

6. A soft-sealed ball valve according to claim 1, characterized in that: An antistatic mechanism is provided between the valve stem and the sphere, and the antistatic mechanism comprises an antistatic steel ball and an antistatic spring, one end of the antistatic spring abuts against the valve stem, one end of the antistatic steel ball abuts against the sphere, and the antistatic spring is in contact with the antistatic steel ball.

7. The soft-sealed ball valve according to claim 1, characterized in that: A packing assembly is provided between the valve stem and the valve body. The packing assembly comprises packing, a packing gland and a packing pressure plate. The packing pressure plate presses the packing gland to thereby press the packing.

8. The soft-sealed ball valve according to claim 1, characterized in that: A grease injection nozzle is provided above the valve stem, a first O-ring and a second O-ring are provided between the valve stem and the valve body, a grease injection hole is provided between the first O-ring and the second O-ring, and the grease injection hole is communicated with the grease injection nozzle.

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