Pneumatic valve body is fixed
Pneumatic valve body is fixed, does not produce mobile after compression. Fixed valve with floating seat, after the medium pressure, mobile seat, make the seal compression on the body, to ensure the seal. Usually with the body of the upper and lower shaft with bearings, operating torque is small, suitable for high pressure and large diameter of the valve. To reduce the number of pneumatic valve operating torque and increase the reliability of the sealing, appeared in recent years, oil seal valve, both betting special lubricant between the sealing surface, in order to form a layer of oil film, which increases the sealing, and reduce operating torque, suitable for high pressure, large diameter of the valve. Flexible pneumatic valve pneumatic valve body is elastic. Body and seat sealing adopts metal materials, sealing pressure is very big, relying on the pressure of the medium itself already could not reach the requirements of sealing, must exert external forces. This valve is suitable for high temperature and high pressure medium. Elastomer is on the lower end of the body wall open one elastic slot, and elasticity. When close the channel, body up with stem wedge-shaped head pressure to seal with the valve seat. Before you turn the body loosen wedge head and body then restore the original prototype, make a small space between the body and valve seat, can reduce the sealing surface friction and operating torque. Pneumatic valve position according to the channel can be divided into straight-through, three general formula and right Angle type. Two kinds of valves for distribution after the medium and change the flow of medium.