The gasket is a type of pump valve fitting, mainly used to fill all the uneven parts between the two joint surfaces, such as the sealing surface between the valve body and the valve cover, to prevent the medium from the joint surface. leakage. The gasket material has a certain elasticity and plasticity at the working temperature and sufficient strength to ensure the seal. At the same time, it must have good corrosion resistance.
In order to meet the above requirements, it is necessary for the type and selection of gasket materials. For the time being, pump and valve fitting gaskets can be divided into soft and hard materials. Soft materials are generally non-metallic materials, such as cardboard, rubber, asbestos rubber sheets, and polytetrafluoroethylene. Hard materials are generally metal materials or metal asbestos, metal and asbestos entangled. At the same time, the shape of the gasket is many, and it is flat, round, elliptical, toothed, lenticular and other special shapes.
Among them, the metal pump valve fitting gasket is usually made of 08, 10, 20 high-quality carbon steel and 1Cr13, 1Cr18Ni9 stainless steel. At the same time, it has high requirements for processing precision and surface finish, and is suitable for high temperature and high pressure valves. The second non-metal gasket material generally has good plasticity, and can be sealed with a small pressure, which is more common in low temperature and low pressure valves.www.pump-casting.com