Ball valve is a common type of valve, which is widely used in industrial pipeline control. The following is a detailed description of the ball valve:
Definition and how it works
Definition: Ball valve is a ball with a circular channel as the opening and closing parts, the ball rotates with the valve stem to achieve the opening and closing action of the valve. GB/T21465-2008 “Valve terminology” defines it as a valve whose opening and closing parts (spheres) are driven by the valve stem and rotate around the axis of the valve stem.
Working principle: The opening and closing part of the ball valve is a sphere with holes, rotating around the axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. When the handle is rotated, the stem drives the ball to rotate, thus changing the shape of the channel in the valve body to realize the on-off control of the fluid.
Characteristics and advantages
1. Small fluid resistance, good sealing performance: ball valve is fully opened or fully closed, the sealing surface of the ball and the seat is isolated from the medium, and the medium will not cause the erosion of the sealing surface of the valve, and the sealing surface material is widely used in various plastics, and the sealing performance is good.
2. Simple structure, small size, light weight: the structure of the ball valve is relatively simple, easy to install and maintain.
3. Easy operation, fast opening and closing: The ball valve only needs to rotate 90° from full opening to full closing, and the opening and closing are fast and lightweight.
4. Wide range of application: ball valve diameter range is wide, from a few millimeters to a few meters, suitable for a variety of media and working conditions.
5. Dust and anti-static: On the process pipeline, the ball valve can release materials and prevent metal particles from entering the pump chamber, while eliminating the risk of fire caused by static electricity.
6. Adjustable flow: Some ball valves (such as V-shaped ball valves) can achieve proportional adjustment of flow.
sort
Ball valve according to different classification standards have a variety of types, including:
According to the structure, it is divided into floating ball valve, fixed ball valve, elastic ball valve and oil seal ball valve.
According to the channel: straight energy type, Angle type and three way type (T shape and L shape).
According to the connection method: threaded connection, flange connection and welded connection.
According to the driving method: manual ball valve, electric ball valve, pneumatic ball valve, etc.
Application situation
Because of its unique advantages, ball valves are widely used in a variety of occasions, including but not limited to:
Oil and gas: Used to control flow and pressure in oil and gas pipelines.
Chemical: Dealing with acids, alkalis, salts and other corrosive chemicals.
Food and pharmaceutical: Control the flow of liquids and gases to ensure the hygiene and safety of production lines.
Sewage treatment: Control the flow and pressure in the sewage treatment system to prevent sewage leakage.
Water supply system: control water flow and pressure to ensure a stable supply of water.
In summary, ball valves, as an important fluid control equipment, play an irreplaceable role in industrial production.
Post time: Jul-30-2024