Ball valve, is a valve by the sphere as the closing member, usually use the round sphere as the intercepting element, the sphere has a circular aperture around the sphere, when the aperture and the pipeline's access to keep all the time, the valve is open, when the aperture and the pipeline's access to each other perpendicular to the valve in the closed state. Ball valve is currently more commonly used type of valve, it has a simple structure, reliable sealing, small size, light weight, lightweight operation and other characteristics.
The principle and structure of ball valve:
Ball valve in the ball is the main interceptor element, the ball is surrounded by rubber or plastic seals, the main role is to make the valve can have a good seal, so as to regulate the flow of media in the pipeline. When the valve is opened, the sphere with the valve stem rotation and rotation, until the flow of the mouth in the open state, when the valve is closed, the sphere turned back to the position of the sealing ring, so as to achieve the role of preventing the flow of media.
Ball valve in the structure mainly consists of valve body, bonnet, stem, ball, seals and other parts. The ball is generally caused by the front and rear symmetrical spherical, it is connected with the valve cover and valve seat through the valve stem and transmission mechanism. When the valve is closed, the valve stem is rotated to the round hole in the sphere and the valve seat isolation, the valve is closed.
The characteristics of the ball valve:
1. Good sealing
The sphere is mainly sealed with rubber or plastic seals during the closing and opening process, which can ensure that there is no leakage of the medium. Compared with other types of valves such as plug valves and globe valves, the sealing performance of ball valves is quite excellent.
2. Lightweight operation
Ball valves open and close at a 90-degree angle, responding quickly and requiring only a slight torque to move the valve linearly. Therefore, in the risk assessment environment, if the need for sudden disposal operation, the ball valve is a very suitable choice.
3. Wide range of applications
Ball valves can be widely used in petroleum, chemical, pharmaceutical and other fields, so in which need to flow regulation and media cut off and other aspects have great advantages.
4. Small size, light weight
Ball valves are manufactured using casting or forging process, with the renewal of materials, the weight is less than other valve options, so that the design of the pipeline will not cause too much load, for the occasion of the space is more narrow, ball valves have become the preferred choice.
5. Long life
As the ball valve interceptor is basically a sphere, the sphere is generally made of metal or thermoplastic materials, which makes the ball valve has a long service life, and maintenance costs are relatively small.
Translated with DeepL.com (free version)
