Valve wider application in various industries, mainly oil, petrochemical, chemical, metallurgy, electricity, water, construction, fire protection, machinery, coal, food, and other (where users machinery and chemical industry valve market is most concerned about, right requirements of the valve is higher). In the current market, the valve user industries most used, the most common varieties of ball valves, globe valves, gate valves, safety valves; followed butterfly and control valves; three, for check valves; four for pressure relief valve, drain valve and steam traps; five for the shut-off valve and diaphragm; six for plug valves, piston valves and other valves. Valve applications in the field containing the greatest variety of mechanical, metallurgical, petrochemical, chemical, construction and other industrial applications of the valve. Especially in the machinery industry, the basic kinds of valves are used. In addition to the machinery industry: Valve mainly used in chemical; butterfly is mainly used in petrochemical and metallurgy; diaphragm valves are mainly used in metallurgy, electric power and chemical industry; Check valves are mainly used in metallurgy, chemical and petrochemical; shut-off valves are mainly used in the oil and chemical; shutoff valve is mainly used in metallurgy, petrochemical, chemical and power; blowdown valve is mainly used in the petrochemical and chemical industry; ball valves are mainly used in petroleum, chemical and metallurgy; Gate valve mainly used in chemical, power and urban construction; regulating valve is mainly used in chemical, metallurgy, electricity and food; plunger valve mainly used in petrochemical and metallurgy; plug valves are mainly used in chemical and metallurgy; valve mainly used in petrochemical, chemical and metallurgy; steam traps are mainly used in chemical and petrochemical;