Large-diameter high-pressure low-torque ball valve

Abstract

The utility model provides a large-diameter high-pressure low-torque ball valve which comprises a ball valve body, and a ball head low-torque electric actuator rotationally installed in the ball valve body is fixed. A communicating pipe body A and a communicating pipe body B are installed at the two ends of the ball valve body respectively, compensation cavities are formed in the communicating pipe body A and the communicating pipe body B respectively, valve seats are installed in the compensation cavities, the communicating pipe body A and the communicating pipe body B are communicated with a compensation cover through communicating holes formed in the communicating pipe body A and the communicating pipe body B, compensation cylinders are evenly distributed on the compensation cover, and compensation pistons are installed in the compensation cylinders. The compensation piston is connected with a cylinder cover through a spring, and the cylinder cover is arranged on the corresponding compensation cylinder; compensation force is indirectly provided through cooperation of multiple components, external force impact of the spring is reduced, the service life of the spring is prolonged, and fault risks are reduced. The spring is arranged externally and can be replaced only by overhauling the compensation cylinder during maintenance, cost is saved, and efficiency is improved. Compensation liquid is combined with the piston to be elastically matched with the spring, dynamic compensation is accurate and flexible, sealing is enhanced, and leakage is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ball valve, especially a large -diameter high pressure low torque ball valve. BACKGROUND

[0002] In the large flow high pressure pipeline system, the large diameter high pressure ball valve plays a vital role, and its core function is to accurately control the flow and block of medium. In order to ensure that the ball head and the valve seat have reliable sealing performance, resist the leakage risk of medium under high pressure environment, the current commonly used way is to set spring compensation mechanism at the valve seat. This mechanism can ensure that the ball head and the valve seat are closely combined to a certain extent, and maintain good sealing state. However, the prior art has obvious defects. Since the spring and the valve seat sealing assembly are directly connected, in the working process of the ball valve, the spring will directly bear the impact force from the medium and the acting force generated by the relative motion of the ball head and the valve seat. Over a long period of time, frequent impact and stress make the spring extremely easy to fatigue and damage, greatly shorten the service life of the spring. More troublesome is that the spring is usually installed inside the valve body, once the compensation effect of the spring is poor due to fatigue and other reasons, the maintenance personnel need to disassemble the entire valve body. This not only involves complex operation process, consumes a lot of time and labor cost, but in many cases, due to the inability to replace the spring alone, the entire valve seat has to be replaced, further increasing the maintenance cost and equipment downtime, seriously affecting the stability and economy of the high pressure pipeline system.

[0003] Therefore, it is necessary to invent a large diameter high pressure low torque ball valve. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the utility model provides a kind of large diameter high pressure low torque ball valve, including ball valve body, ball head, low torque electric actuator, communication pipe body A, communication pipe body B, compensation cavity, valve seat, communication hole, compensation cover, compensation cylinder, compensation piston, spring and cylinder cover, the ball head is rotatably installed in the ball valve body, and is fixed with the output end of low torque electric actuator fixedly installed outside the ball valve body;The two ends of the ball valve body are respectively provided with the communication pipe body A and the communication pipe body B by flange, the compensation cavity is formed in the communication pipe body A and the communication pipe body B, the valve seat is slidably installed in each compensation cavity, the communication pipe body A and the communication pipe body B are communicated with the compensation cover fixedly installed outside by the communication hole formed in itself, a plurality of compensation cylinders are arranged on each compensation cover, the compensation piston is slidably installed in each compensation cylinder, and the cylinder cover is fixedly installed on the corresponding compensation cylinder.

[0005] Preferably, the outer surface of the ball head rotatingly installed in the ball valve body can realize face contact sealing with the end face of the valve seat, and the two valve seats are mirror-imaged arranged at the two sides of the ball head.

[0006] Preferably, the valve seat is slidingly installed in the compensation cavity arranged in the communication pipe body A or the communication pipe body B through a sliding sealing assembly, and the valve seat allows sliding movement in the direction of the compensation cavity.

[0007] Preferably, the compensation cavity has compensation liquid, and the internal compensation liquid can flow into or out of the compensation cover through the communication hole.

[0008] Preferably, a plurality of compensation barrels communicated with each other are arranged in an array on each compensation cover, each compensation barrel is sealingly installed with the barrel cover through a flange, and the barrel cover is elastically connected with the compensation piston slidingly installed in the compensation barrel through a spring.

[0009] Preferably, a one-way injection pipe required for injecting compensation liquid is installed on each compensation cover, the one-way injection pipe is composed of a pipe opening and a one-way valve, and is located between the two compensation barrels.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] The utility model discloses a unique structure design, and the spring and the valve seat sealing assembly are effectively isolated. The spring no longer directly bears the impact force of the medium and the acting force generated by the relative motion of the ball head and the valve seat, but indirectly provides the compensation force for the valve seat through the cooperation of a series of components such as the compensation cavity, the compensation cover, the compensation barrel and the compensation piston. This design greatly reduces the external force impact borne by the spring, greatly improves the working environment of the spring, significantly prolongs the service life of the spring, and reduces the equipment failure risk caused by the damage of the spring.

[0012] When the compensation effect of the spring is not good, the spring is installed in the compensation barrel outside the valve body, so that maintenance personnel do not need to disassemble the whole valve body. Only the compensation barrel part needs to be overhauled, and the spring can be conveniently replaced, so that the operation is simple and convenient. This not only saves a lot of maintenance time and labor cost, but also avoids the high cost caused by replacing the whole valve seat, effectively improves the equipment maintenance efficiency, and guarantees the stable operation of the large-flow high-pressure pipeline system.

[0013] The compensation liquid in the compensation cavity can flow into or flow out of the compensation cover through the communication hole, and in combination with the elastic cooperation of the compensation piston and the spring, dynamic compensation can be provided for the ball seat in real time and accurately according to the pressure change in the pipeline. Compared with the traditional direct compensation mode relying on the spring alone, the compensation mechanism of the utility model is more flexible and efficient, can better adapt to the sealing requirements of the large-diameter high-pressure ball valve under complex working conditions, further improves the sealing performance between the ball head and the valve seat, and effectively reduces the occurrence of medium leakage. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the overall structure schematic diagram of the utility model.

[0015] Figure 2 is the structure schematic diagram of the utility model communication pipe body A not installed.

[0016] Figure 3 is the half cutaway structure schematic diagram of the utility model communication pipe body.

[0017] Figure 4 is the A place local amplification structure schematic diagram of the utility model. Figure 3

[0018] In the drawing:

[0019] Ball valve body 1, ball head 2, low torque electric actuator 3, communication pipe body A 4, communication pipe body B 5, compensation cavity 6, valve seat 7, communication hole 8, compensation cover 9, compensation cylinder 10, compensation piston 11, spring 12, cylinder cover 13, one-way injection pipe fitting 14. DETAILED DESCRIPTION

[0020] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the utility model embodiment will be described clearly and completely below, obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the utility model.

[0021] ​In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0022] As shown in the accompanying Figure 1 to the accompanying Figure 4 drawings:

[0023] The utility model provides a kind of large-diameter high-pressure low-torque ball valve, including ball valve body 1, ball head 2, low-torque electric actuator 3, communicating pipe body A 4, communicating pipe body B 5, compensation cavity 6, valve seat 7, communicating hole 8, compensation cover 9, compensation cylinder 10, compensation piston 11, spring 12 and cylinder cover 13, the ball head 2 of ball valve body 1 inside rotation installation, with its ball valve body 1 outside fixed installation low-torque electric actuator 3 output end is fixed;The two ends of ball valve body 1 are respectively equipped with the communicating pipe body A 4 and communicating pipe body B 5 by flange, the communicating pipe body A 4 and communicating pipe body B 5 are all equipped with compensation cavity 6, each compensation cavity 6 is slidably installed with valve seat 7, the communicating pipe body A 4 and communicating pipe body B 5 are communicated with the compensation cover 9 of its own outside fixed installation by the communicating hole 8 of its own, each compensation cover 9 is evenly provided with a plurality of compensation cylinder 10, each compensation cylinder 10 is slidably installed with compensation piston 11, each compensation piston 11 is connected with corresponding cylinder cover 13 by spring 12, and the cylinder cover 13 is fixedly installed on corresponding compensation cylinder 10.

[0024] Further, the ball head 2 is rotatably installed in the ball valve body 1, and is usually made of high-strength and corrosion-resistant metal materials, such as stainless steel, to ensure its strength and corrosion resistance in a high-pressure environment. The outer surface of the ball head 2 is precisely machined and has high smoothness and dimensional accuracy. The valve seat 7 is also made of wear-resistant and corrosion-resistant materials, such as polytetrafluoroethylene (PTFE) or metal ceramic, to improve sealing performance and service life. The outer surface of the ball head 2 and the end surface of the valve seat 7 can achieve face contact sealing, which can effectively prevent medium leakage. The two valve seats 7 are mirror image arranged on both sides of the ball head 2, and through this symmetrical arrangement, uniform pressure can be applied to the ball head 2 to ensure the stability of the sealing effect.

[0025] Further, the valve seat 7 is sealed and slidably installed in the compensation chamber 6 provided in the communication pipe body A4 or the communication pipe body B5 by a sliding sealing assembly. The sliding sealing assembly is usually composed of a sealing ring and a guide ring. The sealing ring is made of rubber or polytetrafluoroethylene, which can effectively prevent leakage of the compensation liquid in the compensation chamber. The guide ring is made of polyoxymethylene (POM) or other wear-resistant materials to ensure smooth axial sliding movement of the valve seat 7 in the compensation chamber 6. The communication pipe body A4 and the communication pipe body B5 are generally made of the same or similar metal materials as the ball valve body 1 to ensure the overall strength and sealing performance. The valve seat 7 and the compensation chamber 6 are gap-fitted, and the size of the gap is determined according to the specific working conditions and design requirements to ensure the flexibility of the valve seat 7 and prevent leakage of the compensation liquid.

[0026] Further, the compensation chamber 6 is filled with compensation liquid, and the compensation liquid is usually a liquid with good chemical stability and flowability, such as hydraulic oil. The compensation chamber 6 is connected to the compensation cover 9 through the communication hole 8, and the diameter and number of the communication hole 8 are designed according to the flow rate and pressure requirements of the compensation liquid. When the sealing surface between the ball head 2 and the valve seat 7 has a gap due to wear or pressure change, the compensation liquid can flow into or out of the compensation cover 9 through the communication hole 8, thereby achieving the compensation effect of the valve seat 7. The inner walls of the compensation chamber 6 and the communication hole 8 are treated to reduce the flow resistance of the compensation liquid.

[0027] Further, each compensation cover 9 is arrayed with several compensation cylinders 10 in communication, which are generally made of metal material and have high strength and corrosion resistance. The compensation cylinders 10 and the compensation cover 9 are sealed and connected by welding or threaded connection, so as to prevent the compensation liquid from leaking. Each compensation cylinder 10 is sealed and installed with a cylinder cover 13 through a flange, and the flange connection is convenient for disassembly and maintenance. The cylinder cover 13 is elastically connected with a compensation piston 11 which is slidingly and sealingly installed in the compensation cylinder 10 through a spring 12. The spring 12 is made of high-strength alloy steel material and has good elasticity and fatigue performance. The compensation piston 11 has a shape matched with the inner wall of the compensation cylinder 10 and is sealingly and slidingly matched with the compensation cylinder 10 through a sealing ring. When the compensation liquid flows into or out of the compensation cover 9, the compensation piston 11 is pushed to slide in the compensation cylinder 10, so as to compress or stretch the spring 12, thereby realizing the elastic compensation of the valve seat 7.

[0028] Further, each compensation cover 9 is arrayed with several compensation cylinders 10 in communication, which are generally made of metal material and have high strength and corrosion resistance. The compensation cylinders 10 and the compensation cover 9 are sealed and connected by welding or threaded connection, so as to prevent the compensation liquid from leaking. Each compensation cylinder 10 is sealed and installed with a cylinder cover 13 through a flange, and the flange connection is convenient for disassembly and maintenance. The cylinder cover 13 is elastically connected with a compensation piston 11 which is slidingly and sealingly installed in the compensation cylinder 10 through a spring 12. The spring 12 is made of high-strength alloy steel material and has good elasticity and fatigue performance. The compensation piston 11 has a shape matched with the inner wall of the compensation cylinder 10 and is sealingly and slidingly matched with the compensation cylinder 10 through a sealing ring. When the compensation liquid flows into or out of the compensation cover 9, the compensation piston 11 is pushed to slide in the compensation cylinder 10, so as to compress or stretch the spring 12, thereby realizing the elastic compensation of the valve seat 7.

[0029] The working principle is as follows: first, the low-torque electric actuator 3 receives an external control signal to start operation, and the output end drives the ball head 2 installed inside the ball valve body 1 to rotate. When the valve needs to be opened, the ball head 2 is rotated to align the channel thereof with the channels of the communication pipe body A 4 and the communication pipe body B 5, at this time the medium can flow smoothly from the communication pipe body A 4, pass through the channel of the ball head 2, and then flow out from the communication pipe body B 5; when the valve needs to be closed, the ball head 2 is rotated by 90°, so that the channel thereof is perpendicular to the channels of the communication pipe body A 4 and the communication pipe body B 5, thereby blocking the flow of the medium. Since the low-torque electric actuator 3 is adopted, the ball head 2 can be driven to rotate with small torque, thereby reducing energy consumption and operation cost of the equipment.

[0030] When the valve is in normal working state, the outer surface of the ball head 2 and the end surface of the valve seat 7 realize face contact sealing. The ball head 2 is usually made of high-strength, corrosion-resistant metal materials such as stainless steel, and the outer surface is precisely machined. The valve seat 7 is made of polytetrafluoroethylene (PTFE) or metal ceramic, which is wear-resistant and corrosion-resistant. This face contact mode can effectively prevent leakage of the medium. The two valve seats 7 are symmetrically arranged on both sides of the ball head 2 and uniformly apply pressure to the ball head 2, thereby ensuring the stability of the sealing effect.

[0031] With frequent use of the valve, the sealing surface between the ball head 2 and the valve seat 7 can have a gap due to wear, or the sealing performance can be reduced due to the change of the medium pressure. At this time, the compensation liquid in the compensation cavity 6 plays a role. The compensation cavity 6 is filled with compensation liquid such as hydraulic oil which has good chemical stability and fluidity, and the compensation cavity 6 is connected with the compensation cover 9 through the communication hole 8. When the sealing surface has a gap, the pressure in the compensation cavity changes, and the compensation liquid flows into or out of the compensation cover 9 through the communication hole 8.

[0032] The compensation cover 9 is arranged with a plurality of compensation cylinders 10 in array, each compensation cylinder 10 is sealingly and slidingly installed with a compensation piston 11, and the compensation piston 11 is connected with a cylinder cover 13 through a spring 12. When the compensation liquid flows into the compensation cover 9, the compensation piston 11 is pushed to slide in the compensation cylinder 10, so as to compress the spring 12; when the compensation liquid flows out of the compensation cover 9, the elastic force of the spring 12 pushes the compensation piston 11 to slide reversely. The compression and stretching actions of the spring 12 are transmitted to the valve seat 7 through the compensation liquid, so that the valve seat 7 slides axially in the compensation cavity 6, thereby compensating the gap between the ball head 2 and the valve seat 7 due to wear or pressure change, and always maintaining good sealing performance.

[0033] During initial installation or operation of the equipment, if it is necessary to supplement the compensation liquid, the compensation liquid can be injected through the one-way injection pipe fitting 14 installed on the compensation cover 9. The one-way injection pipe fitting 14 is composed of a pipe opening and a one-way valve, the pipe opening is connected with an external compensation liquid injection device, and the one-way valve adopts a one-way conduction structure such as a ball valve or a disc valve, so as to ensure that the compensation liquid can only flow into the compensation cover 9 in one direction, and prevent the compensation liquid from flowing back. The one-way injection pipe fitting 14 and the compensation cover 9 are connected in a sealing connection mode such as threaded connection or welding, so as to ensure the sealing property during injection.

[0034] The technical scheme disclosed by the utility model, or the technical scheme designed by the person skilled in the art under the inspiration of the technical scheme of the utility model, and the similar technical scheme achieving the above technical effects, all fall within the protection scope of the utility model.

Claims

1. A large-bore high-pressure low-torque ball valve, characterized by, The utility model provides a low torque electric actuator compensation ball valve, including ball valve body (1), ball head (2), low torque electric actuator (3), communicating pipe body A (4), communicating pipe body B (5), compensation cavity (6), valve seat (7), communicating hole (8), compensation cover (9), compensation cylinder (10), compensation piston (11), spring (12) and cylinder cover (13), ball head (2) is rotatably installed in ball valve body (1), and with the output end of low torque electric actuator (3) fixedly installed outside ball valve body (1) fixed, the both ends of ball valve body (1) are installed with communicating pipe body A (4) and communicating pipe body B (5) through flange, compensation cavity (6) is set up on communicating pipe body A (4) and communicating pipe body B (5), and valve seat (7) is slidably installed in each compensation cavity (6), and communicating pipe body A (4) and communicating pipe body B (5) are communicated with compensation cover (9) fixedly installed outside through the communicating hole (8) of itself, and a plurality of compensation cylinder (10) are arranged on each compensation cover (9), and compensation piston (11) is slidably installed in each compensation cylinder (10), and each compensation piston (11) is connected with corresponding cylinder cover (13) through spring (12), and the cylinder cover (13) is fixedly installed on corresponding compensation cylinder (10).

2. A large-bore high-pressure low-torque ball valve as claimed in claim 1, characterized in that: The outer surface of ball head (2) rotatably installed in ball valve body (1) can realize the face contact of sealing with the end face of valve seat (7), and two valve seats (7) are arranged in mirror image and are located on the two sides of ball head (2).

3. A large-bore high-pressure low-torque ball valve as claimed in claim 2, characterized in that: Valve seat (7) is slidably installed in compensation cavity (6) arranged on communicating pipe body A (4) or communicating pipe body B (5) through a sliding sealing assembly, and valve seat (7) allows the sliding movement in the direction of compensation cavity (6).

4. A large-bore, high-pressure, low-torque ball valve as defined in claim 3, characterized in that: Compensation cavity (6) has compensation liquid, and the internal compensation liquid can flow into or flow out compensation cover (9) through communicating hole (8).

5. A large-bore, high-pressure, low-torque ball valve as defined in claim 4, characterized in that: A plurality of compensation cylinders (10) are arranged in array on each compensation cover (9) and are communicated, and cylinder cover (13) is sealingly installed on each compensation cylinder (10) through flange, and cylinder cover (13) is elastically connected with compensation piston (11) slidably installed in the compensation cylinder (10) through spring (12).

6. A large-bore, high-pressure, low-torque ball valve as defined in claim 5, characterized in that: Single-way injection pipe fitting (14) required for injecting single compensation liquid is installed on each compensation cover (9), and single-way injection pipe fitting (14) is composed of a pipe opening and a single-way valve and is located between two compensation cylinders (10).

Images