The role of pneumatic valve sealing device (2)

when the pneumatic valve fully open, in order to prevent in the media of a packing seal leakage.
when brake pneumatic valve, pneumatic valve, pneumatic valve throttle pneumatic valve closed, because by the pneumatic valve, pneumatic valve throttle medium flow direction is from the bottom of the disc of upward mobility, so there is no body cavity pressure pneumatic valve closed, the body cavity pressure is lower than the working pressure, so for packing small pressure medium.
when open, need to fill to work under pressure, if the sealing structure, can prevent the work of the pressure seal packing, sealing packing, prolong the service life of pneumatic valves there will be no leakage. It has the seal leakage of filling effect, you can open the pneumatic valve, make the seal in the seal, can relax the packing gland or packing pressure, increase the set of packaging, and then fill in the compression glands, they can ensure the packing density of the pneumatic valve, no leakage phenomenon, therefore, brake pneumatic valves, pneumatic valve, pneumatic valve throttle provide seal.