What kinds of pneumatic valve can be divided into the form of the structure?

The working principle of pneumatic valve is to rely on rotary valve core to keep the valve open or occlusion. Pneumatic valve switch lightweight, small size, can make it big caliber, reliable sealing, simple structure, convenient maintenance, and facial sealing surface often in the closed state, not easily be medium erosion, has been widely used in various industries. Pneumatic valve and plug valve is belong to one type of valve, only its closure is the individual, body around the center line of the valve body rotation to achieve a kind of open and close the valve. Pneumatic valve in the pipeline is mainly used for cutting speed is quick, distribution, and change the flow direction of medium. Pneumatic valve can be divided into the form of the structure of a pneumatic valve pneumatic valve, floating body is floating, under the effect of medium pressure, the physical ability produce certain displacement and compression at the outlet seal surface, guarantee the outlet seal. Floating pneumatic valve has simple structure, good sealing, but body work under medium load all passed export seal, so want to consider the medium of the seal material can withstand the working load. In this structure, it is widely used in low pressure valve. Second, fixed pneumatic valve 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. Three, the elastic 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.