Scouring-resistant ball valve

Abstract

The utility model relates to the technical field of ball valves, and discloses a scouring-resistant ball valve which comprises a valve seat, a ball body and a hard sealing layer, and the ball body is installed in the valve seat; and the hard sealing layer is annularly overlaid between the valve seat and the ball body. The hard sealing layer is used for protecting the matched part of the ball body and the valve seat, and the situation that when the valve works, a medium in a flowing channel washes the ball body, and a ball opening is damaged is prevented. And when the valve is opened and closed, the sealing surface of the valve seat is prevented from being damaged and strained by the ball body, sealing is prevented from being influenced, and valve opening and closing torque abnormity and abnormal sound are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball valve technical field, concretely relates to a scouring resistant ball valve. BACKGROUND

[0002] Hard sealing ball valve is mainly suitable for pipeline system under harsh working conditions such as high temperature, high pressure, corrosive medium etc. When the valve works, the pipeline medium will scour the ball and damage the ball mouth, when the valve opens and closes, the ball mouth damage will pull the valve seat sealing surface, which will affect the sealing, cause the abnormal torque and abnormal sound of the valve opening and closing. SUMMARY

[0003] Therefore, the utility model provides a scouring resistant ball valve to solve the problem that when the valve works, the pipeline medium will scour the ball and damage the ball mouth, when the valve opens and closes, the ball mouth damage will pull the valve seat sealing surface, which will affect the sealing, cause the abnormal torque and abnormal sound of the valve opening and closing.

[0004] In the first aspect, the utility model provides a scouring resistant ball valve, which comprises:

[0005] A valve seat, wherein the valve seat is internally installed with a ball;

[0006] A hard sealing layer, wherein the hard sealing layer is annularly built up welding between the valve seat and the ball.

[0007] Beneficial effects: the hard sealing layer is used to protect the matching part of the ball and the valve seat, prevent the medium in the flow channel from scouring the ball and damaging the ball mouth when the valve works. And when the valve opens and closes, prevent the ball from damaging the sealing surface of the valve seat, which will affect the sealing, cause the abnormal torque and abnormal sound of the valve opening and closing.

[0008] In an optional embodiment, the hard sealing layer comprises:

[0009] A first hard sealing layer, wherein the first hard sealing layer is built up welding on the valve seat;

[0010] A second hard sealing layer, wherein the second hard sealing layer is built up welding on the ball;

[0011] Wherein, the first hard sealing layer and the second hard sealing layer are attached to form a sealing surface intersecting with the material transportation direction.

[0012] Beneficial effects: The hard sealing layer includes a first hard sealing layer and a second hard sealing layer. The first hard sealing layer is annular and consists of two layers, which are symmetrically welded onto the inner walls of the upper and lower sides of the valve seat. The second hard sealing layer is also annular and consists of two layers, which are symmetrically welded onto the outer surfaces of the upper and lower sides of the ball, corresponding to the two first hard sealing layers. In this embodiment, when welding the first and second hard sealing layers, it is necessary to ensure that they are as far away as possible from the flow channel in the middle of the ball to avoid affecting the normal operation of the erosion-resistant ball valve. The first and second hard sealing layers are bonded together to form a sealing surface, which is set to intersect with the material transport direction to prevent material in the flow channel from leaking between the first and second hard sealing layers.

[0013] In one alternative embodiment, the angle between the sealing surface and the axis of the central through hole of the sphere is an acute angle.

[0014] Beneficial effect: It makes the lower end of the sealing surface away from the flow direction of the medium in the flow channel, increasing the overall sealing performance of the ball valve.

[0015] In one alternative embodiment, the distance from one end of the second hard sealing layer away from the axis of the central through hole of the sphere to the axis of the central through hole of the sphere is greater than the distance from one end of the sealing surface away from the axis of the central through hole of the sphere to the axis of the central through hole of the sphere.

[0016] Beneficial effects: The second hard sealing layer is higher than the sealing surface, ensuring that the first hard sealing layer is always in contact with the second hard sealing layer. This prevents the ball from being damaged by contact between the first hard sealing layer and the ball due to slight misalignment caused by vibrations during operation.

[0017] In one alternative implementation, the thickness of the first hard sealing layer is set to be greater than or equal to 3 mm.

[0018] In one alternative embodiment, the distance between the end of the second hard sealing layer away from the axis of the central through hole of the sphere and the end near the axis of the central through hole of the sphere is greater than or equal to 10 mm.

[0019] Beneficial effects: Compared with the thinner sealing layers in existing technologies, which are easily scratched, this embodiment can avoid damage to the sealing surface caused by pipeline scouring and the entry of pipeline medium.

[0020] In one alternative embodiment, a first guide surface is provided on the side of the first hard sealing layer near the axis of the central through hole of the sphere;

[0021] The second hard sealing layer has a second guide surface on the side near the axis of the central through hole of the sphere;

[0022] The first guide surface and the second guide surface form a guide angle.

[0023] Beneficial effects: The lower part of the first hard sealing layer has a first guide surface that gradually slopes downward from left to right, and the lower right part of the second hard sealing layer has a second guide surface that gradually slopes upward from left to right. The first guide surface and the second guide surface form a guide angle, which can guide the medium in the flow channel and avoid the accumulation of medium at the mating point of the ball and the valve seat.

[0024] In one optional embodiment, a third guide surface is provided on the side of the valve seat near the axis of the central through hole of the ball, corresponding to the first guide surface, and the first guide surface and the third guide surface are coplanar.

[0025] Beneficial effects: The second guide surface and the third guide surface form a plane, which extends the latter part of the above-mentioned guide angle and increases the flow guiding length, thereby further avoiding the phenomenon of medium accumulation at the mating point of the ball and the valve seat.

[0026] In one alternative implementation, the hard sealing layer is made of hard alloy.

[0027] Beneficial effect: Increases the service life of the hard sealant layer. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a erosion-resistant ball valve according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Valve seat; 11. Third guide surface;

[0032] 2. Sphere;

[0033] 3. First hard sealing layer; 31. First guide surface;

[0034] 4. Second hard sealing layer; 41. Second guide surface;

[0035] 5. Guide angle. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] Hard-seal ball valves are mainly suitable for pipeline systems under harsh conditions such as high temperature, high pressure, and corrosive media. When the valve is working, the pipeline medium will scour the ball 2, causing damage to the ball orifice. When the valve is opened and closed, the damage to the ball orifice will pull on the sealing surface of the valve seat 1, affecting the seal, causing abnormal valve opening and closing torque and abnormal noise.

[0038] The following is combined Figure 1 The following describes embodiments of the present invention.

[0039] According to an embodiment of the present invention, an erosion-resistant ball valve is provided, comprising: a valve seat 1, a ball 2, and a hard sealing layer.

[0040] like Figure 1 As shown, the ball 2 is installed inside the valve seat 1. A hard sealing layer is installed between the upper and lower sides of the inner wall of the valve seat 1 and the upper and lower sides of the corresponding outer surface of the ball 2. The hard sealing layer is made of hard alloy. The hard sealing layer protects the mating part of the ball 2 and the valve seat 1, preventing the medium in the flow channel from eroding the ball 2 and damaging the ball opening during valve operation. Furthermore, it prevents the ball 2 from damaging or scratching the sealing surface of the valve seat 1 when the valve is opened and closed, thus preventing any impact on the seal, abnormal valve opening / closing torque, and abnormal noise.

[0041] In this embodiment, as Figure 1 As shown, the hard sealing layer includes a first hard sealing layer 3 and a second hard sealing layer 4. The first hard sealing layer 3 is annular and consists of two layers, which are symmetrically welded onto the inner walls of the upper and lower sides of the valve seat 1. The second hard sealing layer 4 is also annular and consists of two layers, which are symmetrically welded onto the outer surfaces of the upper and lower sides of the ball 2, corresponding to the two first hard sealing layers 3. In this embodiment, when welding the first hard sealing layer 3 and the second hard sealing layer 4, it is necessary to ensure that they are as far away as possible from the flow channel in the middle of the ball 2 to avoid affecting the normal operation of the erosion-resistant ball valve. The first hard sealing layer 3 and the second hard sealing layer 4 are bonded together to form a sealing surface, which is designed to intersect with the material transport direction to prevent material in the flow channel from leaking between the first hard sealing layer 3 and the second hard sealing layer 4.

[0042] By setting the first hard sealing layer 3 and the second hard sealing layer 4 to be annular, the first hard sealing layer 3 and the second hard sealing layer 4 are always in contact during the rotation of the ball 2 relative to the valve seat 1.

[0043] Specifically, such as Figure 1 As shown, the sealing surface is a plane, and the angle between the plane containing the sealing surface and the horizontal axis of the central through-hole of ball 2 is an acute angle, meaning the sealing surface in the diagram gradually slopes downwards from left to right. This causes the lower end of the sealing surface to be away from the flow direction of the medium in the flow channel, increasing the overall sealing performance of the ball valve. Of course, in other feasible implementations, the angle between the plane containing the sealing surface and the horizontal axis of the central through-hole of ball 2 can also be an obtuse angle; that is, the sealing surface in the diagram gradually slopes upwards from left to right.

[0044] In one embodiment, such as Figure 1 As shown, the sealing surface can be not only flat, but also curved, etc., as long as the first hard sealing layer 3 and the second hard sealing layer 4 are always in contact during the rotation of the ball 2 relative to the valve seat 1.

[0045] In one embodiment, such as Figure 1 As shown, the thickness of the second hard sealing layer 4 gradually decreases in the vertical direction perpendicular to the horizontal axis of the central through-hole of the ball 2, from near the center of the ball 2 to away from the center of the ball 2. On the left side of the second hard sealing layer 4 near the center of the ball 2, the distance from the end of the second hard sealing layer 4 away from the axis of the central through-hole of the ball 2 to the axis of the central through-hole of the ball 2 is greater than the distance from the end of the sealing surface away from the axis of the central through-hole of the ball 2 to the axis of the central through-hole of the ball 2. This ensures that the second hard sealing layer 4 is higher than the sealing surface, ensuring that the first hard sealing layer 3 is always in contact with the second hard sealing layer 4, preventing damage to the ball 2 caused by slight misalignment between the ball 2 and the valve seat 1 due to vibrations during operation.

[0046] In one embodiment, such as Figure 1 As shown, the thickness of the first hard sealing layer 3 is 'a', which is greater than or equal to 3 mm. The distance between the end of the second hard sealing layer 4 furthest from the axis of the central through hole of the sphere 2 and the end closest to the axis of the central through hole of the sphere 2 is 'b', which is greater than or equal to 10 mm. Compared with the thinner sealing layers in the prior art, which are easily scratched, this embodiment can avoid damage to the sealing surface due to pipeline erosion and the ingress of pipeline medium.

[0047] In one embodiment, such as Figure 1As shown, the first hard sealing layer 3 has a first guide surface 31 on the side near the axis of the central through hole of the sphere 2; the second hard sealing layer 4 has a second guide surface 41 on the side near the axis of the central through hole of the sphere 2. Specifically, as... Figure 1 As shown, the lower part of the first hard sealing layer 3 has a first guide surface 31 that gradually slopes downward from left to right, and the lower right part of the second hard sealing layer 4 has a second guide surface 41 that gradually slopes upward from left to right. The first guide surface 31 and the second guide surface 41 form a guide angle 5, which can guide the medium in the flow channel and avoid the accumulation of medium at the mating point of the ball 2 and the valve seat 1.

[0048] In one embodiment, such as Figure 1 As shown, a third guide surface 11 is provided on the side of the valve seat 1 near the axis of the central through hole of the ball 2, corresponding to the first guide surface 31. The first guide surface 31 and the third guide surface 11 are coplanar. The second guide surface 41 and the third guide surface 11 form a plane, extending the latter part of the aforementioned guide angle 5 and lengthening the flow guiding length, thereby further preventing the accumulation of medium at the mating point of the ball 2 and the valve seat 1.

[0049] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A ball valve resistant to erosion, characterized in that, include: Valve seat (1), wherein a ball (2) is installed inside the valve seat (1); A hard sealing layer is annularly welded between the valve seat (1) and the ball (2); The rigid sealing layer includes: The first hard sealing layer (3) is welded onto the valve seat (1); The second hard sealing layer (4) is welded onto the sphere (2); The first hard sealing layer (3) is bonded to the second hard sealing layer (4) to form a sealing surface that intersects with the material transport direction; The distance from the end of the second hard sealing layer (4) away from the axis of the central through hole of the sphere (2) to the axis of the central through hole of the sphere (2) is greater than the distance from the end of the sealing surface away from the axis of the central through hole of the sphere (2) to the axis of the central through hole of the sphere (2).

2. The erosion-resistant ball valve according to claim 1, characterized in that, The angle between the sealing surface and the axis of the central through hole of the sphere (2) is an acute angle.

3. The erosion-resistant ball valve according to claim 1, characterized in that, The thickness of the first hard sealing layer (3) is set to be greater than or equal to 3 mm.

4. The erosion-resistant ball valve according to claim 1, characterized in that, The distance between the end of the second hard sealing layer (4) away from the axis of the central through hole of the sphere (2) and the end near the axis of the central through hole of the sphere (2) is greater than or equal to 10 mm.

5. The erosion-resistant ball valve according to claim 1, characterized in that, The first hard sealing layer (3) has a first guide surface (31) on one side near the axis of the central through hole of the sphere (2); The second hard sealing layer (4) has a second guide surface (41) on one side near the axis of the central through hole of the sphere (2); The first guide surface (31) and the second guide surface (41) form a guide angle (5).

6. The erosion-resistant ball valve according to claim 5, characterized in that, The valve seat (1) has a third guide surface (11) on the side of the ball (2) near the axis of the central through hole, corresponding to the first guide surface (31), and the first guide surface (31) and the third guide surface (11) are coplanar.

7. The erosion-resistant ball valve according to claim 5, characterized in that, The hard sealing layer is made of hard alloy.

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