Electric butterfly valves are widely used not only in general industry such as oil, gas, chemical, water treatment, but also in cooling water system of thermal power station. It is suitable for HVAC and refrigeration industries, and can also be used in industrial areas, general service areas and water treatment systems.
Commonly used butterfly valves are the two types of Butterfly Valves and Flanged Butterfly Valves. Clamped butterfly valve is a double-headed bolt will be connected to the valve between the two pipeline flange, flange butterfly valve is a valve with a flange, with bolts on the valve on both ends. Butterfly valve, also known as flap valve, is a simple structure of the regulating valve, the main role is used to cut off the circulation of the medium in the pipeline, or to regulate the size of the medium flow in the pipeline.
Secondly, butterfly valve can also be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil, liquid metals and radioactive media.
In addition, the butterfly valve should be installed on the pipeline which is completely sealed and has zero leakage in gas test. It mainly plays the role of cutting off and throttling on the pipeline. Butterfly valve opening and closing member is a disc-shaped butterfly plate, rotating around its own axis in the valve body, the rotation angle of 0 ° - 90 ° between, rotated to 90 °, the valve is in the fully open state. So as to achieve the purpose of opening and closing or regulating. Butterfly plate thickness is the resistance of the medium flow through the valve body, so it has better flow control characteristics. Resilient sealing valve, sealing ring can be set in the valve body or attached to the butterfly plate around.
Second, the principle of control:
Electric butterfly valve energy source is electricity, electricity drives the valve plate operation, so as to achieve the opening and closing of the valve and circulation or cut off the role of the fluid. Input 220V power supply can be directly switching adjustment, can also be built-in servo module, input control signals (4 ~ 20mADC or 1 ~ 5VDC) and single-phase power supply can control the operation. The electric actuator of electric butterfly valve can be divided into switching type and regulating type, switching type electric butterfly valve is to play the role of switching; and regulating type electric butterfly valve is to play the role of regulating the flow rate, which can be adjusted to the flow rate to a thousandth of a degree, and it is also a kind of valve with a higher price. Regulating type is to AC220V power supply as a driving force, receiving industrial automation control system preset parameter value 4 ~ 20mA (0 ~ 5, etc. weak control) signals to complete the adjustment action.
Third, the working power supply:
Usually: AC220V, AC110V, AC24V, AC380V, DC12V, DC24V, DC110V, and so on. Input signal: 4~20mA, 0~10V, 1-5V and other weak electrical signals. Receive 4~20mA signal from industrial automation control system to precisely control the valve opening, so as to achieve the adjustment and control of different process parameters such as flow, temperature, pressure, etc. Widely used in food, environmental protection, light industry, petroleum, chemical industry, water treatment, municipal engineering, papermaking, electric power, water treatment and other industries in the industrial process automatic control system.
Four, features:
1,Butterfly valve open and close conveniently and quickly, labour-saving, small fluid resistance, can be frequently operated.
2,Butterfly valve structure is simple, small size, light weight.
3,Electric butterfly valve can transport slurry, in the pipeline mouth accumulates the least liquid.
4,Electric butterfly valve can achieve good sealing under low pressure.
5,Electric butterfly valve has good regulation performance.