the valve is widely used in the construction of the national economy of a kind of mechanical products. The valve in the oil, natural gas, coal, metallurgy, mining and ore, refining processing and pipeline system; in petrochemical, chemical products, medicine, and food production systems; The valve in the water and electricity, thermal power and nuclear power in electric power production system; The valve in the urban construction of water supply and drainage, heating and gas supply system; The valve in metallurgical production system; in vessels, vehicles, aircraft and aerospace and mechanical fluid system, the use of various kinds of sports; The valve in the field of defense production and new technology; The Industrial Valves in the agricultural irrigation and drainage system has a lot of demand. The valve automatic valve and drive the valve. Automatic valve ( Such as safety valve, relief valve, steam trap, check valve) Is by the changes of device or the medium pressure pipe itself to achieve the purpose of opening and closing. Drives the valve ( Gate valve, globe valve, ball valve, butterfly valve, etc. ) By driving gear ( Manual, electric, hydraulic, pneumatic, etc. ) Drive control device or the medium inside the pipeline pressure, flow and direction. As a result of the medium pressure, temperature, flow rate and different physical and chemical properties, control of the equipment and piping system demands and use is also different, so the valve type specification very much. Incomplete statistics show, my fruit product varieties has reached more than four thousand types of valve, nearly forty thousand specifications, valve plays a great role in economic life.

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