However, if the water hammer is eliminated, a water hammer absorber or a slow closing check valve must be installed. Only the butterfly check valve with slow closing function has the function of waterproof hammer. However, the sealing of ball valves generally uses flexible materials, which is also very difficult to use in high-temperature and high-pressure pipelines. In contrast, the sealing of the electric butterfly valve is better than that of the ball valve. The characteristic of this check valve is to limit the flow direction of the medium, so that the medium will flow in one direction. Generally, swing type and lift type are used. Therefore, before use, we need to understand in detail, so that we can better select the electric butterfly valve. Of course, this is also a secret function, of course, we also need to understand. 　　　　

The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc shaped butterfly plate rotates around the axis with the rotation angle between 0 ° and 90 °. When the rotation angle reaches 90 °, the valve is fully open. The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. The valve can be quickly opened and closed only by rotating 90 °, which is simple to operate. At the same time, the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. Butterfly valve has two sealing types: elastic seal and metal seal. For elastic sealing valve, the sealing ring can be embedded on the valve body or attached to the periphery of the butterfly plate. Metal sealed valves generally have longer service life than elastic sealed valves, but it is difficult to achieve complete sealing. The metal seal can adapt to higher working temperature, while the elastic seal has the defect of temperature limitation. If the 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 structure principle of butterfly valve is particularly suitable for making large diameter valves. Butterfly valves are not only widely used in petroleum, gas, chemical, water treatment and other general industries, but also used in the cooling water system of thermal power stations.