Before the installation of the valve, the appearance inspection must be carried out to see if the nameplate of the lower valve meets the requirements of the current national standard "General Valve Marking" GB 12220. For the working pressure is greater than 1.0 MPa and the main pipe to play the role of cut-off sanitary valve, the installation before the intensity and tightness of the performance test, after passing the standard use. Strength test, the test pressure of 1.5 times the nominal pressure, the duration of not less than 5min, valve housing, packing no leakage was qualified. Cast steel ball valve tightness test, the test pressure of 1.1 times the nominal pressure; test pressure in the test duration should be consistent with GB 50243 standard requirements, no leakage valve flap sealing as qualified.
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