Video animation tutorial on the working principle of butterfly valve
A butterfly valve is a valve that uses a circular butterfly plate as an opening and closing member and rotates with the valve stem to open, close, and adjust the fluid channel. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the valve body of the butterfly valve, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0 ° and 90 °. When it is rotated to 90 °, the valve is fully open.
Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastic seals have the disadvantage of being limited by temperature.
If the butterfly valve is required for flow control, the main thing is to choose the size and type of the valve correctly. The structural principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as oil, gas, chemical, and water treatment, but also in cooling water systems of thermal power stations.
Commonly used butterfly valves are wafer-type butterfly valves, flange-type butterfly valves, butt-welded butterfly valves. Wafer type butterfly valve is to connect the valve between the two pipeline flanges with double-headed bolts; flange type butterfly valve is to have a flange on the valve, and use bolts to connect the two ends of the valve to the pipeline flange; Both ends of the butterfly valve are welded to the pipeline.
The streamlined design of the butterfly plate makes the fluid resistance loss small, which can be described as an energy-saving product.
The valve stem is a through-rod structure, after quenching and tempering, it has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the valve stem only rotates and does not move up and down. The packing of the valve stem is not easy to damage and the seal is reliable. It is fixed with the taper pin of the butterfly plate, and the outgoing end is designed to prevent the outgoing type, so as to prevent the valve rod from collapsing when the connection between the valve rod and the butterfly plate is accidentally broken.
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