1, installation location, height, import and export direction must conform to the design requirements, the connection should be firmly close.
2. All kinds of manual valves installed on the insulated pipe, the handle shall not be downward.
3), the valve must be installed before the appearance inspection, the valve nameplate should conform to the current national standard "universal valve sign" GB 12220 of the provisions. For the work pressure is greater than 1.0 MPa and in the main pipe to cut off the role of the valve, should be installed before the strength and tightness can be tested, qualified after the use. Strength test, the test pressure is 1.5 times times the nominal pressure, the duration is not less than 5min, valve shell, filler should be no leakage for qualified. In the tightness test, the test pressure is 1.1 times times the nominal pressure, and the test pressure should meet the GB 50243 standard in the duration of the test, and the valve seal surface without leakage is qualified.