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Valves used in waterworks, the water plant, water supply capacity of 05000 cubic meters of water from the river, there are many kinds of materials can satisfy the using demand of the water supply and drainage in the valve shell, but the correct and reasonable choice, can obtain the economic life of the valve and the best performance.
According to a 2004 ministry of no. 218 document, gray cast iron pipes, pipe fittings "shall not be used for urban water supply, gas and other municipal pipeline system. Diameter > 400 mm pipes and pipe fittings are not allowed in the sewage treatment plant drainage pumping station and municipal drainage pipe network in the pressure pipeline in the use of" requirements, urban water supply valve shell material ruled out the gray cast iron.