Valve gasket material requirements

On the valve, the gasket is the primary seal against media leakage and is used to fill all irregularities between the two mating faces, such as the sealing face between the valve body and bonnet, to prevent media from escaping from between the mating faces leakage. Gaskets can also be divided into two kinds of soft and hard. Soft is generally non-metallic, such as cardboard, rubber, asbestos rubber sheet, PTFE; hard generally metal or metal asbestos, metal and asbestos wound gasket. Metal gasket materials generally 10 high-quality carbon steel and 1Cr18Ni9 stainless steel, high precision and finish requirements, the strength of solid bolts are larger, are used for high temperature and high pressure valves. Valve gasket material requirements are corrosion-resistant, while at the working temperature has a certain degree of flexibility and plasticity, and sufficient strength to ensure that the seal. A reasonable selection of gasket material and type should be based on the working conditions of the media, such as temperature, pressure and corrosiveness.