Specification for pre-installation inspection of copper valves
Before installing the Brass angle valve, I am willing not only to consider the installation height, location, import and export direction, etc., but also to conduct a comprehensive safety inspection of the copper valve. The appearance inspection must be carried out before the copper valve is installed, and the nameplate of the valve should conform to the current national standard, the general valve mark GB 12220. For valves with a working pressure greater than 1.0 MPa and the function of cutting off the main pipe, the strength and tightness performance test should be carried out before installation, and the valve can be used only after passing the test.
During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve shell and packing should be qualified without leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure; the test pressure should meet the requirements of the GB 50243 standard for the duration of the test, and the sealing surface of the valve disc is qualified if there is no leakage.
The inspection methods of different copper valves are not nearly the same. Before installation, we must strictly follow the inspection standards to ensure the quality and safety of copper valves.