The distribution of the valve market mainly depends on the construction of engineering projects. The petrochemical industry, electric department, metallurgic industry, chemical industry and urban construction organization are the main and biggest customers of the valve manufacturers. Petrochemical industry mainly uses gate valve, globe valve and check valve of API standard. Electric department mainly uses high temperature pressure gate valve, globe valve, check valve and some low pressure butterfly valve, gate valve of the drain valve. Stainless steel gate valve, globe valve and check valve are applied to chemical industry. Metallurgic industry mainly adopts low pressure large-size butterfly valve, oxygen globe valve and oxygen ball valve. Low pressure valve is mainly used in urban construction organizations, for example, urban water supply pipeline mainly uses large-size gate valve, building construction mainly adopts center line-type butterfly valve and metal sealing butterfly valve is used in city heating. Pipe laying employs flat gate valve and ball valve. Stainless steel ball valve is applied in pharmaceutical industry and food industry.