Butterfly valve working principle animation demonstration

Butterfly valve is a kind of valve that uses the round butterfly plate as the opening and closing part 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 pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, the rotation Angle is between 0° and 90°, and the valve is fully open when it is rotated to 90°.

Butterfly valve has the characteristics of simple structure, small size, light weight, material consumption, small installation size, quick switching, 90° reciprocating rotation, small driving torque, etc., for cutting, connecting, adjusting the medium in the pipeline, with good fluid control characteristics and closing sealing performance. 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 small, so it has better flow control characteristics. Butterfly valves have two types of seal: bullet seal and metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.

The valve with metal seal generally has a longer life than the valve with elastic seal, but it is difficult to achieve complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have temperature-limited defects.

If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of valve. The structure principle of butterfly valve is especially suitable for the production of large diameter valves. Butterfly valve is not only widely used in petroleum, gas, chemical industry, water treatment and other general industry, but also used in the cooling water system of thermal power station.

The linear 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 tempering treatment, has good comprehensive mechanical properties and corrosion resistance, abrasion resistance. When the butterfly valve is opened and closed, the valve stem only rotates without lifting and lifting operation, and 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 overhang end is designed to prevent the valve stem from breaking out when the connection between the valve stem and the butterfly plate is accidentally broken.