Electrically adjustable butterfly valves are electric and electric control valve of a species. Connections are: flanged and wafer type. Industrial automation and control is an important execution units. Electric control valve installation points two analyzes: the installation location, altitude, direction and export must meet the design requirements, pay attention to the direction of flow of the medium should be consistent with the direction of the arrow on the valve body, the connection should be firmly tight. Electric control valve must be visually checked before installation, the valve plate should comply with existing national standards, "Universal Valve logo" GB12220's. For working pressure greater than 1.0MPa and the role played off valves on the main pipe before installing the strength and rigorous performance tests should be carried out. Passing behind the prospective use. Strength test electric flange soft sealing valve, test pressure is 1.5 times the nominal high pressure flange valve Z41H-40C, the duration of not less than 5min slagging valve, the valve housing, packing should be no leakage as qualified. Electric control valve according to the structure can be divided into bias plate, vertical plate, inclined plate and leveraged. Press the seal can be divided into soft and hard seal sealed two. Soft sealing type commonly used rubber ring seal, seal type commonly used hard metal ring seal. Form by sealing points: (1) mandatory sealing butterfly valve. 1) elastic sealing butterfly valve. Sealing pressure when the valve is closed by the valve plate squeeze resilient seat, seat or valve plate production. 2) applied torque sealing butterfly valve. Sealing pressure generated by the applied torque to the valve shaft. (2) pressurized sealing butterfly valve. Sealing pressure seal or valve seat by playing board member pressurized components produced. (3) self-sealing valve. Sealing pressure is automatically generated by the media pressure. Slagging gate valve _ _ 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!