Self-reliance type pneumatic - valve structure of the material

Self-reliance type pneumatic - valve structure of the material 1) To product conforms to the inspection certificate or the type testing system, under pressure of the valve shell material can be other materials for the following general categories: - ferritic class; - austenitic class; - duplex stainless steel. 2) If a class of self-reliance type pneumatic control valve is covered by the existing body of the test valve, its coverage can be extended to austenite and dual phase steel, not as long as a moderate size of the same design of valve testing this materials. 3) Other pressure valve shell materials need to press 2. 5. 2. 7 ( 3) And 2. 5. 2. 8 ( 4) requires all on behalf of the nominal size of the test. 4) Ferroalloy bolts ( Such as B7 / about) As the connection of the pressure valve shell, can prove that the austenitic adjustment bolt, but not the dragon in turn. 5) About the seat and closed seal, valve seat and the seal between the valve body, valve stem seal and the valve body sealing of non-metallic materials, need to do verification, filled ptfe, however, RPTFE） Can prove that the filled ptfe ( RPTFE） And vice versa.