Metal gasket there are three main types: 1) Octagonal and oval pad & ndash; — Applicable to the trapezoidal groove flange sealing surface; 2) Tooth form is in metallic flat gasket seal surface processing the conical tooth corrugated & ndash; — Applicable to the concave and convex flange sealing surface; 3) Lens gasket & ndash; — Suitable for lens type flange sealing surface. Metal gasket pure iron, mild steel, stainless steel, aluminum and other materials. Metal gasket sealing surface of high machining accuracy and surface roughness requirements, bolt clamping force is very big, used in high temperature and high pressure valves. 2 graphite gaskets made of flexible graphite gaskets, suitable for high temperature and strong corrosive medium. 3 spiral wound gasket consists of corrugated metal belt and sealing material with twine. With steel belt - Asbestos, steel belt - Ptfe, steel belt - Flexible graphite, etc. Commonly used in concave and convex flange sealing surface. Suitable for high temperature medium pressure Industrial Valves. 4 ptfe gaskets are used for mortise type sealing surface, there are mainly glass fiber ptfe teflon and two kinds of materials. Suitable for all kinds of low temperature stress of strong corrosive medium. 5 asbestos rubber gasket is suitable for the smooth type flange sealing surface, concave and convex flange sealing surface and mortise flange sealing surface. Advantage is better corrosion resistance and thermal stability, good plasticity, with smaller pressure force guarantee seal. Defect is low intensity, easy to stick to the flange sealing surface. Asbestos rubber gasket has universal asbestos board, anticorrosive asbestos board, asbestos board, acid is commonly used in asbestos board, oil resistant asbestos board, asbestos board clip wire and other materials. Used in the high temperature medium pressure Industrial Valves. 6 metal package graphite gaskets made of thin metal cladding annular asbestos gasket. Commonly used in concave and convex flange sealing surface. Suitable for high temperature and pressure of the Industrial Valves.
Clouds of resilient gate valve failures surround the world of y gate valve in particular, simply because people don’t pay as much attention to the resilient wedge gate valve as they should do.
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As the manufacturing procedure of ductile iron gate valve becomes more regulated, the costs to businesses will increase and the workforce will suffer as a result.