Pneumatic valve seat diameter on average

the DMp pneumatic seat average diameter, when in fact it is along the diameter D: role, after allowing pressure pneumatic valve seat. When the open new sphere below the channel in a pneumatic valve seat sealing surface, make the pneumatic seat - Some lose bearing, so in medium pressure under the action of bending deformation. When continue rotating sphere, it will be a sphere channel edge crush by losing its sealing performance ( See figure - ） 。 Prevent pneumatic seat crushed before, can take to reduce the pressure differential between the B and A cavity or A method based on fixed pneumatic seat in A reliable way. In order to reduce the differential pressure pneumatic seat, pneumatic valve seat can be several unloading trough cylindrical surface, so that working medium into the B cavity. To make the medium from A chamber into B cavity, pneumatic valve seat can be pushed out clearance before C. With teflon or drugs do this kind of pneumatic valve seat can reference - 。 Figure - Under the effect of differential pressure pneumatic bending figure - seat Pneumatic valve pneumatic ball valve seat reference graph this opening unloading trough pneumatic valve seat is suitable for Dg & lt; 毫米。 When Dg & gt; Mm, can choose figure - The method of fixed pneumatic valve seat. Figure - , as shown in a pneumatic seat by means of embedding groove spring coil bearing in the groove. Because the spring coil is not completely reliable mechanical components. This method is recommended for Dg - Mm, nominal pressure no greater than KGF/cm of pneumatic valve. Pneumatic valves for high pressure, large diameter, appropriate USES figure - The structure of b. Pneumatic valve seat by two and a half circle bearing in the slot.