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​In 10 BC, the ancient Roman architect Vitruvius described a lifting machine in his architectural manual. This machine has a mast with a pulley on the top of the mast. The position of the mast is fixed by a guy cable, and the cable passing through the pulley is pulled by a winch to lift the heavy ob......

Generally divided into: gate valve, globe valve, throttle valve, ball valve, butterfly valve, diaphragm valve, plug valve, check valve, safety valve, self-operated pressure regulating valve, trap, etc.