What is the main functions of the high pressure pneumatic - valve?

High pressure pneumatic control valve of the main function is to what? High pressure pneumatic regulator is the most important function in positive pressure seal is good, in a reverse pressure or reverse pressure is greater than positive pressure can also be properly sealed. When positive pressure, medium pressure push valve plate moving forward, deformation of the valve stem, valve plate seal face close to the valve seat sealing surface pressure, steps into the body seat, and good sealing. When reverse pressure, medium pressure push valve plate backward, deformation of the valve stem, medium pressure at the same time, push the seat sealing surface to the valve plate seal face pressure, will seat position to stem the limit deformation, good seal.