The retractable butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, rapid switching, 90 degree reciprocal rotation, small drive torque, etc. It is used to cut off, connect and regulate the medium in pipelines, Good fluid control characteristics and close sealing performance. When the retractable butterfly valve is in the fully open position, the thickness of the retractable butterfly valve is the 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 retractable butterfly valve has two seal types: elastic seal and metal seal. Elastic sealing valve, sealing ring can be mounted on the valve body or attached around the butterfly plate.
Metal-sealed valves for telescopic butterfly valves generally have longer life than elastomer-sealed valves, but they are difficult to completely seal. Metal seals can accommodate higher operating temperatures, while elastomeric seals have temperature-restricted defects. If a retractable butterfly valve is required for flow control, the correct choice of valve size and type is essential. The structural principle of the retractable butterfly valve is particularly suitable for making large-diameter valves. The retractable butterfly valve is not only applied in the general industry such as petroleum, gas, chemical industry and water treatment, but also applied to the cooling water system of the thermal power station.
The commonly used retractable butterfly valves include three kinds of wafer-type butterfly valves, flange-type butterfly valves and butt-welded butterfly valves. The clip-on butterfly valve uses a stud bolt to connect the valve between the two pipe flanges; the flanged butterfly valve has a flange on the valve; the upper flanges of the valve are connected to the pipe flange by bolts; butt welding Both ends of the butterfly valve are welded to the pipe. The streamlined design of the butterfly plate, so that the fluid resistance loss is small, can be described as an energy-saving products. 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 performs rotary motion without lifting operation. The packing of the valve stem is not easy to damage, and the seal is reliable. The utility model is fixed with a butterfly taper pin, and the outstretched end is of an anti-bump type design, so as to prevent the valve stem from collapsing when the stem and the butterfly plate are accidentally broken.
1, small and lightweight, easy to disassemble and repair, and can be installed in any position.
2, the structure is simple and compact, the operating torque is small, and the 90-degree rotation turns on quickly.
3, the flow characteristics of the linear trend, good regulation performance.
4. The connection between the butterfly plate and the valve stem adopts a non-pin structure to overcome possible internal leakage points.
5, seals can be replaced, and sealed reliably to achieve two-way seal.
6, the butterfly board can spray coating according to user requirements, such as nylon or polytetrafluoroethylene.
7, the valve can be designed for flange connection and clip connection.
8, the drive mode can choose manual, electric or pneumatic.