Construction installation points of electric pneumatic control valve

Valve installation position, height, import and export direction must conform to the requirements of the design conforms to the mouth direction, connection should be firmly connected. Valves available various forms of end connected to the pipe. One of the main connection mode with screw thread, flange and welding connection. Flange connection, if the temperature exceeds 350 ℃, due to the creep relaxation bolts, flange and gasket, should choose high temperature bolt material. A visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards GB12220 'universal signal valve' regulation. For the working pressure is greater than 1. 0 mpa and the valve with the function of cutting off on ZhuGanGuan, should carry on the strength and leak test, qualified rear must use. Other valves not tested alone, stay in the system pressure test. Strength test, the test pressure for the nominal pressure of 1. 5 times, duration of not less than 5 min, shell and packing shall be no leakage of the valve. Leak test, the test pressure for the nominal pressure of 1. 1 times; Test pressure constant, must be maintained in the duration of the test time shall comply with the provisions of the eligible for valve sealing surface with no leakage. Nominal diameter: DN15-500.