Butterfly valve installation requirements

Butterfly valve installation position, height, import and export direction must comply with the design requirements, the connection should be firmly connected. All kinds of manual valves installed on the thermal insulation pipe, handle shall not down. A visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards 'universal signal valve' GB 12220. For the working pressure is greater than 1. 0 MPa and the valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. 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 valve shall be qualified. Leak test, the test pressure for the nominal pressure of 1. 1 times; The duration of the test pressure in the test should comply with the standard of GB 50243 requirements, with no leakage for qualified for valve sealing surface.