The Working Principle of Electric Butterfly Valve and The Characteristics of Butterfly Valve
The electric butterfly valve has simple structure, small size, light weight, low material consumption, small installation size, rapid switching, 90° reciprocating rotation, and driving torque
small and other characteristics, used to cut off, connect and adjust the medium in the pipeline, with good fluid control characteristics and closing and sealing performance. Butterfly valve is in the end
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 better
flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded on the valve body or
is attached to the periphery of the butterfly board.
Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seal can adapt to higher work
temperature, elastic seal has the defect of being limited by temperature.
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 the valve. The structure principle of butterfly valve is especially suitable for production
Large diameter valve. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, water treatment, etc., but also used in cooling of thermal power stations.
Water system.
The commonly used butterfly valves include wafer type butterfly valve, flange type butterfly valve and butt welding butterfly valve. Wafer butterfly valve is connected to two pipes with stud bolts
between the flanges; flanged butterfly valve has a flange on the valve, the two ends of the valve flange are connected to the pipe flange with bolts; the two butt-welded butterfly valves
The end face is welded to the pipe.
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, which has been quenched and tempered, and has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the stem only works
Rotating movement without lifting operation, the valve stem packing is not easy to damage, and the sealing is reliable. It is fixed with the butterfly plate cone pin, and the extension end is designed to prevent rush-out.
Prevent the valve stem from collapsing when the connection between the valve stem and the butterfly plate is accidentally broken.
