Electric butterfly valve is a kind of regulating valve device used in automatic control system. The control principle of the valve is that it can lead and control the closing of the valve according to the signal of the power supply. Electric butterfly valve has many functions. It is a multi-functional valve that integrates check valve, control valve and shut-off valve. In addition, it is usually equipped with manual control settings, which can be used for emergency treatment in the form of manual emergency treatment when the power supply is not smooth to ensure normal operation. This kind of electric valve is currently used in many places, such as in food processing, petroleum processing and other enterprises.
The working principle of electric butterfly valve:
Electric butterfly valve is composed of electric actuator and butterfly valve, so it has the advantages of easy operation and simple structure of butterfly valve, and is also widely used in chemical, pharmaceutical and other industries. Commonly used electric butterfly valves include two types: wafer type electric butterfly valve and flange type electric butterfly valve. And because of the assistance of electric actuators, the development of butterfly valves has reached a new level.
The principle of the electric butterfly valve is actually very simple. The energy source is electricity, and the electricity drives the operation of the valve plate, so as to open and close the valve and circulate or cut off the fluid. The switch can be adjusted directly by inputting 220V power supply, and the servo module can also be built in, and the operation can be controlled by inputting the control signal (4~20mADC or 1~5VDC) and single-phase power supply.
The electric actuator of the electric butterfly valve can be divided into switch type and adjustment type. The switch type electric butterfly valve plays the role of a switch; and the adjustment type electric butterfly valve plays the role of regulating the flow, which can accurately adjust the flow to thousands of degrees. It is also a relatively expensive valve. Electric butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in the cooling water system of thermal power plants.
As a device installed in the pipeline, it seems impractical to check the on-off status of the valve, so there is a feedback signal. When the electric butterfly valve is placed, it should be ensured that the electric device is not squeezed and the wiring terminals are not damaged, and that it is prevented from contacting corrosive substances. Handling should be handled with care to avoid damage to electrical components and mechanical parts.
The adjustment type itself has a feedback signal, and the switch type can choose whether to install the feedback signal according to the specific needs of the customer. Electric plastic butterfly valve, also known as PVC electric butterfly valve, is composed of an integrated electric actuator and a plastic butterfly valve. The adjustment type is powered by AC220V power supply, and receives the preset parameter value 4~20mA (0~5 and other weak current control) signals of the industrial automation control system to complete the adjustment action.