Ball valve and gate valve are the same type of valve, the difference is that its closing part is a ball, the ball rotates around the body center line to achieve open, close a valve. Ball valves are mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. Flanged ball valve standard GB/T21465-2008 "Valve terminology" is defined as: the opening and closing parts (ball) driven by the stem, and around the axis of the stem for rotating movement of the valve.
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