General requirements gb pneumatic valves are commonly used materials

pneumatic valve, pneumatic valve cap, flange material, should be selected according to conditions of use and manufacturing requirements, and shall comply with GB, GB, GB and GB.
materials to be used A bolt, stud,,,, CrMoA and MnVB etc. , should be selected according to working pressure and temperature, and should comply with the regulations of GB, GB and GB.
materials to be used A nut,,,,,, CrMoA and MnVB etc. , should be selected according to working pressure and temperature, and should comply with the regulations of GB, GB and GB.
shall not be used for precision casting nominal pressure PN> 。 The pneumatic valve MPa.
the graphite material should be paid attention to the following situations might occur:
a. Higher than ℃ carbon steel;
　b. Higher than ℃ carbon molybdenum steel;
　c. Chrome molybdenum steel ( Chromium. About above ℃ under the %.
the following situations should be paid attention to the possibility of peroxide reaction ( Scale:
a. About above Cr - ℃ or more 。 Mo, steel. Cr- 。 Mo, Cr - steel Mo and Cr - steel Mo steel;
　b. About above Cr - ℃ or more 。 Mo steel.