Electric regulating butterfly valve belongs to electric valve and electric regulating valve in a variety. The main connection modes are: flange type and clamp type. It is an important execution unit in the field of industrial automation control. Electric adjustment butterfly valve installation points two analysis: installation position, 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 arrow marked by the valve body, the connection should be firm and close.
Appearance inspection must be carried out before installation. The nameplate of the valve should conform to the provisions of the current national standard “Universal Valve Mark” GB12220. For the working pressure is greater than 1.0MPa and in the main pipe to cut off the role of the valve, before installation should be carried out strength and tight performance test. Qualified only after permitted use. Strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5min, the valve shell, packing should be qualified without leakage.
Electric adjustment butterfly valve according to the structure can be divided into bias plate, vertical plate, inclined plate and lever type. According to the seal form can be divided into soft seal type and hard seal type two. Soft seal type is usually sealed by rubber ring, hard seal type is usually sealed by metal ring.
Electric adjustment butterfly valve is usually composed of angular travel electric actuator (0~90° partial rotation) and the butterfly valve as a whole through mechanical connection, after installation and debugging. According to the action mode, there are: switch type and regulator type.
Switch type is directly connected to the power supply (AC220V or other power supply grade) through the switch positive, anti-conduction to complete the switching action.
Regulating type is based on AC220V power supply as the power, receive industrial automatic control system preset parameter value 4~20mA (0~5 and other weak current control) signals to complete the adjustment action.
Electric adjustment butterfly valve application:
Suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, the robustness of the butterfly plate under the pressure of the pipeline medium should also be considered when closed. In addition, the limitations of the operating temperature that the elastic seat material can withstand at high temperatures must be considered. The structure length and overall height of the butterfly valve is small, the opening and closing speed is fast, and has good fluid control characteristics, the structure principle of the butterfly valve is most suitable for the production of large diameter valves. When the butterfly valve is required to be used for flow control, the most important thing is to correctly select the size and type of butterfly valve, so that it can work properly and effectively.
It is suitable for fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, oil and all kinds of acid and alkali and other pipelines requiring complete sealing, zero gas test leakage, high life requirements, working temperature in -10 degrees ~ 150 degrees.
Soft seal eccentric butterfly valve is suitable for ventilation and dust removal pipeline two-way opening and closing and adjustment, widely used in metallurgy, light industry, electric power, petrochemical system of gas pipelines and waterways.
Metal-to-metal wire sealed 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.
Construction and installation points:
1), the installation position, height, import and export direction must meet the design requirements, pay attention to the direction of the medium flow should be consistent with the direction of the arrow marked by the valve body, the connection should be firm and close.
2) The appearance of the valve must be inspected before installation. The nameplate of the valve should conform to the provisions of the current national standard “Universal Valve Mark” GB12220. For valves whose working pressure is greater than 1.0MPa and which play a cutting role on the main pipe, the strength and tight performance test should be carried out before installation, and the qualified back can be used. Strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5min, the valve shell, packing should be qualified without leakage.