How to choose check valve GSD-8 1, check valve (aetv One-way valve): generally suitable for cleaning media, should not be used for containing solid particles and a larger viscosity medium. 2, for the low-pressure check valve DN50mm (aetv One-way valve) :, should choose butterfly check valves, vertical lifting check valve and diaphragm check valve; DN for more than 200mm, less than 1200mm in the low pressure Non-return valve should be selected without wear ball valve; for DN greater than 50mm, less than 2000mm low-pressure check valve, should choose butterfly check valve and diaphragm check valve. 3, the diaphragm check valve is suitable for easy to produce water hammer on the pipeline, the diaphragm can be very good to eliminate the water hammer caused by the media counter-current, but by the temperature and pressure limits, generally used in low-pressure room temperature pipe. 4, for the request to close the water hammer impact is smaller or no water hit the pipe, should use the slow closing Swing Check Valve and slow closing butterfly check valve. 5, construction, installation points 1), installation location, height, direction of import and export must meet the design requirements, pay attention to the direction of the flow of media should be consistent with the direction of the arrow marked body, the connection should be firmly. 2), the appearance of the valve must be installed before the inspection, the valve nameplate should be consistent with the current national standard "General Valve Flags" GB 12220 requirements. For the working pressure is greater than 1.0 MPa and the main pipe to play the role of cut-off valve, the installation should be carried out before the intensity and tightness test, qualified after 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 should be no leakage as qualified. Tightness test, the test pressure of 1.1 times the nominal pressure; test duration in line with the requirements of GB 50243. 3) Do not subject the check valve to heavy loads in the pipeline. Large aetv One-way valve: Independently supported so that it is not affected by the pressure generated by the piping system.
Water Analysis Measurement
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