Electric adjustment butterfly valve is a kind of electr […]
Electric adjustment butterfly valve is a kind of electric valve and electric control valve. The main connection methods are: flange type and wafer type. It is an important execution unit in the field of industrial automation control. Electric adjustment butterfly valve installation points two major analysis: installation location, height, import and export direction must meet the design requirements, pay attention to the direction of media flow should be consistent with the direction of the body arrow, the connection should be firmly close. Electric adjustment butterfly valve must be checked before installation. The nameplate of the valve shall comply with the current national standard "General Valve Marking" GB12220. For valves with a work pressure greater than 1.0 MPa and a cut-off on the main pipe, strength and tightness tests shall be performed before installation. Qualified to use. In the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve housing and the packing should have no leakage as qualified. Electric adjustment butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structural form. According to the sealed form, it can be divided into soft seal type and hard seal type. Soft seals are generally rubber ring seals, and hard seals are usually metal ring seals.
Electric regulation butterfly valve structure principle:
The electric butterfly valve is usually composed of a quarter-turn electric actuator (0~90° partial rotation) and the butterfly valve as a whole through a mechanical connection, after the installation and debugging. Classification according to the operating mode: switch type and adjustment type.
Switch type is directly connected to the power supply (AC220V or other power supply level power supply) through the switch forward and reverse guide to complete the switching action.
The regulating type uses the AC220V power supply as the power and receives the preset parameter value of 4~20mA (0~5 weak current control) signal from the industrial automation control system to complete the adjustment action.
Electric butterfly valve applications:
Electric adjustment butterfly valve is suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, the robustness of the butterfly plate to withstand the medium pressure of the pipeline should also be considered. In addition, it is also necessary to consider the limitation of the operating temperature of the elastic seat material at high temperatures. The butterfly valve has a small structural length and overall height, fast opening and closing speeds, and good fluid control characteristics. The structural principle of the butterfly valve is most suitable for making large-diameter valves. When a butterfly valve is required to control the flow, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and effectively.
Electric adjusting butterfly valve is suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, medicine, oil products and so on that require complete sealing, zero gas test leakage, high life expectancy, working temperature -10 degrees to 150 degrees. Various acid and other pipelines.
Soft seal eccentric butterfly valve is suitable for bidirectional opening, closing and adjustment of ventilation and dust removal pipelines. It is widely used in gas pipelines and waterways of metallurgy, light industry, electric power, and petrochemical systems.
Metal to metal wire seal double eccentric butterfly valve is suitable for urban heating, gas supply, water supply and other gas, oil, acid and alkali pipelines, as a regulating and throttling device.