A ball valve is a type of valve that achieves opening and closing and flow regulation by rotating the ball 90 degrees. Due to its simple structure, good sealing performance, low fluid resistance, and convenient operation, ball valves are widely used in various fields. The following is a detailed introduction to ball valves and their application areas.
Classification of Ball Valves
Classified by structural form:
Floating ball valve: The ball can float within a certain range under the pressure of the medium to achieve sealing.
Fixed ball valve: The ball is fixed by the upper and lower shafts, and the sealing surface does not move. It is used for high-pressure large-diameter valves.
Elastic ball valve: The ball has elasticity and is used to reduce sealing pressure.
Classified by channel form:
Straight through ball valve: The inlet and outlet are in a straight line, and the medium flow resistance is small.
Three way ball valve: There are two types: T-shaped and L-shaped, which can simultaneously connect three pipelines for diversion, mixing, or switching.
Four way ball valve: used for complex flow control.
Classified by sealing form:
Soft sealed ball valve: The sealing pair material is non-metallic, with good sealing performance, but it is not resistant to high temperature and high pressure.
Hard sealed ball valve: The sealing pair material is metal material, which is resistant to high temperature and pressure, but the sealing performance is relatively poor.
Classified by driving method:
Manual ball valve: operated by a handle or handwheel, suitable for small diameter and low-pressure applications.
Electric ball valve: Operated by an electric actuator, it can be remotely controlled and is suitable for automation control systems.
Pneumatic ball valve: operated by a pneumatic actuator, suitable for quick opening and frequent operation.
The main characteristics of ball valves
Low fluid resistance:
The full bore design of ball valves ensures that the medium has almost no flow resistance.
Good sealing performance:
The sealing surface material of the ball valve is made of polytetrafluoroethylene, which has good self-lubricating and elastic properties, ensuring a tight seal.
Easy to operate:
Simply rotate 90 degrees to quickly open and close, facilitating remote control and automated operations.
High pressure and high temperature resistance:
Hard sealed ball valves can withstand high pressure and high temperature working conditions.
Long service life:
The wear between the sphere and the sealing seat is small, and the service life is long.