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Knife Gate Valve Cast Steel - Z73 - Farpro Valve Knife gate valve cast steel Z73 is widely used in all kinds of water supply and drainage, construction, petroleum, chemical, gas (natural gas), food, medicine, power station, nuclear point, urban sewage and other pipelines. It’s mainly used to adjust the valve or cut off the flow of various types of media containing coarse particles, sticky liquid, floating dirt, etc.