Flanged joints sealing mechanism

After tightening the bolt, the spacer between the two flange sealing surface a certain sealing force per unit area at this time gasket sealing force called preload than pressure preload than a certain pressure of the spacer deformation, thus ensuring the contact surface of the seal. Gasket different materials, sealing pressure ratio requirements are also different. When the medium pressure rises, due to the internal pressure  Hydraulic adapters force of the spacer than the preload state has decreased. In order to ensure the sealing performance of work under the required time is not less than the pressure washer m × p (p is pressure, m is required to achieve the spacer material and the sealing of the valueFlange leaks with leak rate to represent. Gas leakage rate is typically much larger than the rate of leakage of the liquid, generally with the gasket sealing performance under pressure of nitrogen gas to evaluate the leak rate. A gasket for the purpose, the leakage rate and the internal pressure P L and preload pressure ratio is the relationship y1 y1 = a + b ln (P / L). Where a, b ​​are characteristic constants of gasket material.