metal spiral wound gasket is a kind of semi-metallic flat gasket made of metal belt and non-metal belt spirally wound. Its characteristics are: good compression and resilience performance; multi-channel sealing and certain self-tightening function; not sensitive to the defects of the flange compression sealing surface, not bonding the flange sealing surface; easy to center, easy to disassemble and assemble ; It can partially eliminate the influence of pressure, temperature changes and mechanical vibration; it can maintain excellent sealing performance under various harsh conditions such as high temperature, low temperature, high vacuum, and shock vibration.