Anti-collision pigging valve

Abstract

The utility model relates to an anti-collision pigging valve, which belongs to the field of valves, and comprises a valve body, a valve seat, a ball body, a valve rod, a transmission mechanism and a pigging device assembly, the valve body is provided with an inlet channel, an outlet channel and a pigging device receiving and transmitting channel, the anti-collision ball is characterized in that an anti-collision sleeve made of a hard material is arranged in the through hole of the ball body, the anti-collision sleeve is fixedly installed in the through hole of the ball body through at least two radial screws, the diameter of an inner hole of the anti-collision sleeve is equal to that of an inner hole of the inlet-outlet channel, and spherical curved surfaces with the diameter equal to that of the ball body are arranged at the two ends. The anti-collision sleeve can be replaced on line after being damaged due to long-term collision. The device has the advantages of low manufacturing cost, good use performance, convenience in maintenance and replacement, low maintenance cost and the like.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and particularly relates to a pigging valve. Background Art

[0002] The pigging valve is used for cleaning the internal flow path of the medium conveying pipeline in various industries. The existing pigging devices generally adopt a ball valve structure, and the structure includes a valve body, a valve seat, a ball, a valve stem and a pigging device assembly. The valve body has concentric inlet and outlet channels and a pigging device receiving and sending channel perpendicular to the center line of the inlet and outlet channels. The ball has a flow channel hole with the same inner diameter as the inlet and outlet channels. When the pipeline needs to be cleaned, the ball flow channel hole is aligned with the pigging device receiving and sending channel by rotating the valve stem, the pigging device is placed into the ball flow channel hole, and then the ball is rotated to align its flow channel hole with the inlet and outlet channels, and the pigging device enters the inlet or outlet channel to clean the pipeline. Its main disadvantages are as follows: when receiving and sending the pigging device, collisions will occur between the pigging device and the inner wall of the ball flow channel hole, which easily damages the ball flow channel. After repeated use, the service performance of the ball will be affected. In severe cases, the ball needs to be replaced, resulting in an increase in equipment maintenance costs. Content of the Utility Model

[0003] Aiming at the disadvantages existing in the prior art, the utility model provides an anti-collision pigging valve in which the ball flow channel hole is composed of an impact-resistant sleeve, improving the impact resistance of the ball flow channel hole. When the ball flow channel hole is damaged, only the sleeve needs to be replaced online, and it has reliable service performance and low maintenance cost.

[0004] The technical solution for realizing the utility model is as follows:

[0005] An anti-collision pigging valve includes a valve body, a valve seat, a ball, a valve stem, a transmission mechanism and a pigging device assembly. The valve body has concentric inlet and outlet channels and a pigging device receiving and sending channel perpendicular to the center line of the inlet and outlet channels. The ball is provided with a through hole. The valve seat is installed at the connection between the inlet and outlet channels and the valve cavity through a valve seat support ring. The sealing surface of the valve seat and the spherical surface of the ball cooperate with each other to form a sealing pair. The transmission mechanism is fixedly installed at the upper end of the valve body through a bracket, a connecting disc and an upper cover. The lower end of the valve stem is connected to the ball, and the upper end passes through the shaft hole of the upper cover and is connected to the transmission mechanism. Its characteristics are: an impact-resistant sleeve made of hard material is arranged in the through hole of the ball. The impact-resistant sleeve is fixedly installed in the through hole of the ball by at least two radial screws. The inner diameter of its inner hole is equal to the inner diameter of the inlet and outlet channels, and both ends have spherical surfaces with the same diameter as the ball. The spherical surface cooperates with the sealing surface of the valve seat to form a sealing pair in the valve opening state.

[0006] The preferred solution is that annular welding grooves are respectively arranged on the spherical surfaces of the outer cylindrical surfaces at both ends of the impact-resistant sleeve, and hard materials are surfacing welded in the annular welding grooves to form sealing welding rings. The two ends of the impact-resistant sleeve and the sealing welding rings are ground to form a spherical surface integrated with the spherical surface of the ball.

[0007] Preferably, a grease injection cavity is arranged in the valve seat support ring. The grease injection cavity and the sphere surface form a sealed cavity when the valve is in the closed state, and a grease injection valve communicating with the grease injection cavity is arranged on the valve body.

[0008] Preferably, a composite sealing structure composed of a grease injection sealing device and a packing sealing device is formed between the valve stem and the upper cover. The grease injection sealing device is composed of arranging a grease injection sealing cavity between two sealing rings on the inner wall of the shaft hole of the upper cover and installing a second grease injection valve on the upper cover and communicating with the grease injection sealing cavity.

[0009] The beneficial effects of the present utility model compared with the prior art are as follows: an anti-collision sleeve made of hard material is arranged in the through hole of the sphere, reducing the material cost of the sphere, improving the anti-collision performance during the process of receiving and sending the pig and the service reliability of the sphere; moreover, when the anti-collision sleeve is damaged due to long-term use, only the anti-collision sleeve needs to be replaced online, which is convenient for maintenance and has low maintenance cost. Brief Description of the Drawings

[0010] Figure 1 is a structural schematic diagram of the present utility model.

[0011] In the figure: 1 valve body, 2 sphere, 3 bottom cover, 4 valve seat, 5 valve seat support ring, 6 spring, 7 grease injection cavity, 8 grease injection valve, 9 valve stem, 10 upper cover, 11 second grease injection valve, 12 sealing ring, 13 packing sealing device, 14 connection disc, 15 bracket, 16 anti-collision sleeve, 17 sealing welding ring, 18 radial screw. Detailed Embodiment

[0012] Such as Figure 1The anti-collision pigging valve shown in the figure includes a valve body 1, a valve seat 4, a sphere 2, a valve stem 9, a transmission mechanism and a pigging component. The valve body 1 has concentric inlet and outlet channels and a pigging receiver and transmitter channel perpendicular to the center line of the inlet and outlet channels. The valve body 1 is composed of a left valve body, a right valve body and a middle valve body. The inlet and outlet channels are arranged in the left and right valve bodies, and the pigging receiver and transmitter channel is arranged in the middle valve body. The sphere 2 has a through hole. The valve seat 4 is installed at the connection between the inlet and outlet channels and the valve cavity through a valve seat support ring 5. The sealing surface of the valve seat 4 and the spherical surface of the sphere 2 cooperate with each other to form a sealing pair. A spring 6 is arranged in the spring cavity between the valve seat support ring 5 and the radial inner step of the valve body 1. The transmission mechanism is fixedly installed at the upper end of the valve body 1 through a bracket 15, a connecting plate 14 and an upper cover 10. The lower end of the valve stem 9 is connected to the upper end of the sphere 2, and the upper end passes through the shaft hole of the upper cover 10 and is connected to the transmission mechanism. The positioning hole at the lower end of the sphere 2 is movably and cooperatively connected with the positioning shaft at the upper part of the bottom cover 3 installed at the bottom of the valve body 1. When cleaning the pipeline, the through hole of the sphere 2 is rotated to align with the pigging receiver and transmitter channel, the cover plate of the pigging component is opened, and the pigging tool is placed into the through hole of the sphere 2 to realize the cleaning of the inner hole of the pipeline. Its characteristics are: an anti-collision sleeve 16 made of hard material is arranged in the through hole of the sphere 2. The anti-collision sleeve 16 is fixedly installed in the through hole of the sphere 2 by at least two radial screws 18. The inner diameter of its inner hole is equal to the inner diameter of the inlet and outlet channels, and both ends have spherical surfaces with the same diameter as the sphere 2. This spherical surface forms a sealing pair with the sealing surface of the valve seat 4 in the valve opening state. Utilizing the anti-collision performance of the anti-collision sleeve 16, the sphere 2 can be made of ordinary materials, which can reduce the manufacturing cost. Moreover, after the anti-collision sleeve 16 is damaged by the long-term collision of the pigging tool, the anti-collision sleeve 16 can be replaced online, and there is no need to disassemble the valve to repair and replace the sphere 2. The maintenance and replacement are convenient, and the maintenance cost is low.

[0013] Annular welding grooves are respectively arranged on the spheres at the outer cylindrical surfaces at both ends of the anti-collision sleeve 16. Hard materials are built-up welded in the annular welding grooves to form sealing welding rings 17. The two ends of the anti-collision sleeve 16 and the sealing welding rings 17 are ground to form a spherical surface integrated with the surface of the sphere 2, that is, the two end surfaces of the anti-collision sleeve 16, the surfaces of the sealing welding rings 17 and the surface of the sphere 2 form an integral spherical surface.

[0014] A grease injection cavity 7 is arranged in the valve seat support ring 5. The grease injection cavity 7 forms a sealed cavity with the surface of the sphere 2 in the valve closed state. A grease injection valve 8 communicated with the grease injection cavity 7 is arranged on the valve body 1. In the valve closed state, sealing grease is injected into the grease injection cavity 7 through the grease injection valve 8 to form a double-sealing structure with the valve seat 4.

[0015] A composite sealing structure is formed by a grease injection sealing device and a packing sealing device 13 between the valve stem 9 and the upper cover 10. The grease injection sealing device consists of a grease injection sealing cavity arranged between two sealing rings 12 on the inner wall of the shaft hole of the upper cover 10 and a second grease injection valve 11 installed on the upper cover 10 and communicating with the grease injection sealing cavity. Sealing grease is injected into the grease injection sealing cavity through the second grease injection valve 11 to form a multi-layer composite sealing structure with the packing sealing device 13, improving the sealing performance of the middle cavity.

Claims

1. An anti-collision pigging valve, comprising a valve body (1), a valve seat (4), a sphere (2), a valve stem (9), a transmission mechanism and a pigging device assembly. The valve body (1) has concentric inlet and outlet channels and a pigging device receiving and sending channel perpendicular to the center lines of the inlet and outlet channels. The sphere (2) has a through hole. The valve seat (4) is installed at the connection of the inlet and outlet channels and the valve cavity through a valve seat support ring (5). The transmission mechanism is fixedly installed at the upper end of the valve body (1) through a bracket (15), a connection disc (14) and an upper cover (10). The lower end of the valve stem (9) is connected to the upper end of the sphere (2), and the upper end passes through the shaft hole of the upper cover (10) and is connected to the transmission mechanism. It is characterized in that: An anti-collision sleeve (16) made of a hard material is arranged in the through hole of the sphere (2). The anti-collision sleeve (16) is fixedly installed in the through hole of the sphere (2) by at least two radial screws (18). The inner hole diameter thereof is equal to the inner hole diameter of the inlet and outlet channels, and both ends have spherical surfaces with the same diameter as the sphere (2). The spherical surfaces cooperate with the sealing surface of the valve seat (4) to form a sealing pair in the valve opening state.

2. The anti-collision pigging valve according to claim 1, characterized in that: Annular welding grooves are respectively arranged on the sphere (2) of the outer cylindrical surfaces at both ends of the anti-collision sleeve (16). A hard material is built-up welded in the annular welding grooves to form a sealing welding ring (17). The two ends of the anti-collision sleeve (16) and the sealing welding ring (17) are ground to form a spherical surface integral with the surface of the sphere (2).

3. The anti-collision pigging valve according to claim 1 or 2, characterized in that: at A grease injection cavity (7) is arranged in the valve seat support ring (5). The grease injection cavity (7) forms a sealed cavity with the surface of the sphere (2) in the valve closed state. A grease injection valve (8) communicating with the grease injection cavity (7) is arranged on the valve body (1).

4. The anti-collision pig valve according to claim 1 or 2, characterized in that: A composite sealing structure is formed between the valve stem (9) and the upper cover (10) by a grease injection sealing device and a packing sealing device (13). The grease injection sealing device is composed of a grease injection sealing cavity arranged between two sealing rings (12) on the inner wall of the shaft hole of the upper cover (10) and a second grease injection valve (11) installed on the upper cover (10) and communicating with the grease injection sealing cavity.

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