According to the working pressure points: (1) vacuum valve. Working pressure is lower than standard atmospheric pressure valve stack. (2) low-pressure valve. Nominal pressure PN <1.6MPa butterfly. (3) the pressure valve. For 2.5--6.4MPa butterfly, PN. (4) high-pressure valve. For 10.0--80.0MPa butterfly, PN. (5) high pressure valve. Nominal pressure PN> 100MPa butterfly. Butterfly is reciprocating rotary disc hoist about 90 ° to open, close or adjust a valve medium flow. Butterfly not only simple in structure, small size, light weight, material consumption province, small installation size, small drive torque, easy operation, fast first valve plant in Tianjin, and also can have both good flow regulation and closure sealing characteristics Tianjin Tanggu Valve Group, is one of the fastest growing valve varieties last decade of development. Butterfly valve is widely used. Variety and quantity of its use continues to expand, and to high temperature, high pressure, large-diameter, high tightness, long life, excellent regulation characteristics, as well as the development of a multifunctional valve. Its reliability and other performance indicators have reached a high level. The first valve plant in Tianjin, valves, valve provided by the Hong Kong Ming Ming Port Valve Co., Ltd., Dongguan. Port Valve Co., Ltd., Dongguan Ming (www.gdmgfm.com) strong, credible, butterfly and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the next port of the valve and you hand into the brilliant, for a better future!