The electric adjustment butterfly valve is a type of electric valve and electric control valve. The main connection methods are: flange type and wafer type, which are important execution units in the field of industrial automation control. Two major points for installation of electric adjustment butterfly valve: installation position, height, and inlet and outlet direction must meet the design requirements. Note that the direction of media flow should be consistent with the direction of the arrow marked on the valve body, and the connection should be firm and tight. The electric adjustment butterfly valve must be inspected before installation. The nameplate of the valve should comply with the current national standard "General Valve Mark" GB12220. For valves with a working pressure greater than 1.0 MPa and a shut-off effect on the main pipe, strength and tight performance tests shall be carried out prior to installation. Qualified and used. In the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5 min, and the valve casing and the packing should be free of leakage. According to the structure, the electric adjustment butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type; according to the sealing form, it can be divided into soft seal type and hard seal type; soft seal type generally adopts rubber ring seal and hard seal type. Metal ring seals are usually used.