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Standard :( Fire-proof, anti-static) TypeDesign StandardStructural LengthConnecting mannerPressure temperatureTest&InspectionSwing Check ValveANSI B16.34 API6DANSI B16.10ANSI B16.5ANSI B16.34API 598 Features: 1.The design and manufacturing are fit for the standard of ANSI B16.34 and the requirement of API 6D 2. The petal is the swing type, straight-way channel. It can be installed in the level pipeline and vertical pipeline 3. The built-in rocker and stud reduces the outer leakage 4. The body and bonnet are connected with the stud, under the situation of high pressure the pressure is higher than 600Lb. For the part of the middle flange, the self-sealing structure of the inner pressure is aoopted which make the product lighter and smaller in size. And the sealing is reliable.