Valve sealing requirements for gasket materials1

Valve sealing requirements for gasket materials

On the valve, the gasket is the main seal to prevent the leakage of the medium. It is used to fill the unevenness of the mechanical seal between the two joint surfaces of the seal factory (such as the sealing surface between the valve body and the valve cover). , in order to prevent the leakage of the medium from the bonding surface. Gaskets can also be divided into two types: soft and hard. Soft is generally non-metallic, such as cardboard, rubber, asbestos rubber sheet, polyvinyl fluoride; hard is generally metal or metal-coated asbestos, metal and asbestos intertwined gaskets. The materials of metal gaskets are generally 10 high-quality carbon steel and 1Cr18Ni9 stainless steel, which require high machining accuracy and smoothness, and the strength of strong bolts is also large. They are all used for high temperature and high pressure valves. The requirements of the valve for the gasket material are corrosion resistance, and at the same time, it has a certain elasticity and plasticity at the working temperature and sufficient strength to ensure sealing. Reasonable selection of gasket material and type should be determined according to the working conditions of the medium, such as temperature, pressure and corrosiveness.