High pressure pipe thread and pneumatic valve test

　 ） High pressure pneumatic valve strength and leak test shall be carried out individually. Strength test pressure is equal to the nominal pressure pneumatic valves. Times, leak test pressure is equal to the nominal pressure.
　　） High pressure pneumatic valves shall take % per batch and not less than a disintegration of checks, if there is any unqualified need to check one by one.
high pressure pipeline besides the flange interface, also can use union, used for pipe need to open it.