The structure of the pneumatic ball valve

Pneumatic ball valve has the following three kinds of structure forms:

1. Fixed ball pneumatic ball valve. Pneumatic ball valve ball is fixed, does not produce mobile after compression. After the medium pressure, fixed ball valve with a seat on the mobile, make the seal ring compression on the ball, to ensure the seal. Ball bearings mounted on the upper and lower axis, operating torque is small, suitable for high pressure and large diameter of the valve. To reduce the number of pneumatic ball valve operating torque and increase the reliability of the sealing, appeared in recent years, oil seal ball valve, betting special lubricant between the sealing surface, more suitable for the high pressure, large diameter of ball valve.


2. The elastic ball pneumatic ball valve. Pneumatic ball valve of the sphere is elastic. Ball and seat sealing ring is made of metal material sealing pressure is very big, must be applied to force to achieve the requirement of the seal. This valve is suitable for high temperature and high pressure medium. Elastic ball is on the lower end of the sphere wall open one elastic slot, and elasticity. When close the channel, sphere rolling out with stem wedge-shaped head pressure to seal with the valve seat. Wedge head before you turn the sphere are released, the sphere then restore the prototype, appear very small gap between the sphere and valve seat, can reduce the sealing surface friction and operating torque. Pneumatic ball valve position according to the channel can be divided into straight-through, three general formula and the right Angle, used for distribution of medium and change the flow of medium.


3. Floating pneumatic ball valves. Pneumatic ball valve ball is floating. In the medium pressure, pneumatic ball valve ball fitness produce certain displacement and compression at the outlet seal surface, guarantee the outlet seal. Floating pneumatic ball valve has simple structure, good sealing, but all spheres of work under medium load to export sealing ring, so want to consider to seal material can withstand the working load of sphere medium. In this structure, it is widely used in low pressure ball valve.








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