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Working Principles of Electric Butterfly Valves


1. Overview of electric butterfly valves


With the rapid development of the country's industrial manufacturing industry, the industry's demand for valves is also increasing, especially for electric butterfly valves and electric ball valves, which are particularly prominent among many valves, and belong to the more common types in pipelines! As a component used to realize the on-off and flow control of the pipeline system, the electric actuated butterfly valve is more and more widely used in practical applications due to its excellent quality and performance.


Electric butterfly valves can be generally divided into common electric wafer butterfly valves and electric flanged butterfly valves according to different connection methods. Its sealing material is divided into soft sealing and hard sealing. The working power usually has: AC220V, AC380V and DC24V. The input signal includes 4~20mA 0~10V and other weak current signals, which are divided into switch type and adjustment type according to the control form. The switch type plays the role of a switch, and the regulating type is used to adjust the flow, which can accurately adjust the flow to a thousand degrees, and is a relatively expensive valve.


2. Working principles of electric butterfly valves


The electrically operated butterfly valve uses electric energy as the driving force, and drives the valve stem through the electric device, so that the butterfly plate produces a 90° rotary motion to achieve the opening and closing of the valve. The industrial automation control system or other signals can also be used to precisely control the valve opening, so as to achieve the control of flow rate, temperature, pressure and other adjustment and other different process parameters. The principle of the electric butterfly valve is actually very simple. Just like the daily razor, 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. Input 220V power supply can directly adjust the switching value, alternatively, the built-in servo module can be used, and the operation can be controlled by inputting a control signal and a single-phase power supply.


The electric actuator of electric butterfly valve can be divided into switch type and adjustment type. The switch-type electric butterfly valve acts as a switch. The regulating type electric butterfly valve plays the role of regulating the flow, which can accurately adjust the flow to a thousand degrees, and it is also a kind of valve with a relatively high price. 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 placing the electric butterfly valve, ensure that the electric device is not squeezed and the wiring terminals are not damaged, and prevent contact with corrosive substances. Handling should be handled with care to avoid damage to electrical components and mechanical parts. The regulating 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.


The electric actuated butterfly valve uses studs to connect the valve between two pipeline flanges. The flanged electric butterfly valve is equipped with flanges on the valve, and then bolts are used to connect the flanges at both ends of the valve to the pipe flanges. If the electric butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of the valve. The structural principle of the electric butterfly valve is especially suitable for the production of large-diameter valves.


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