Electric butterfly valve is suitable for situations requiring flow regulation. The pressure loss of butterfly valve in the pipeline is relatively large, about three times that of gate valve. Therefore, when choosing butterfly valve, the influence of pressure loss on the pipeline system should be fully considered, and the firmness of the butterfly plate under the pipeline medium pressure when it is closed should also be considered. In addition, it is necessary to consider the working temperature limit of elastic seat material under high temperature. The structure length and overall height of butterfly valve are small, opening and shutting speed is fast, and it has good fluid control characteristics. The structure principle of butterfly valve is most suitable for making large-diameter valve.
When the electric butterfly valve is required to control the flow, the most important thing is to select the size and type of the butterfly valve correctly so that it can work properly and effectively. The middle line butterfly valve usually requires a short structure length, fast opening and closing speed (1/4 revolution) in throttling, regulating control and mud medium. If low pressure cut-off is required (small differential pressure), we recommend butterfly valve. The butterfly valve can also be used when there are two position adjustments, contraction of ground channels, low noise, cavitation and gasification, a small amount of leakage to the atmosphere, and abrasive medium. When the butterfly valve is used under special working conditions, such as throttling regulation, strict sealing, severe wear, low temperature (deep cold) and other working conditions, it is necessary to use the special butterfly valve with three eccentric or double eccentric designed metal sealing belt adjustment devices.
Structural features of electric butterfly valve
- 1. It still has stable sealing performance under high temperature and high pressure. Its special sealing system can guarantee high sealing performance in all temperature ranges from ultra-low temperature to ultra-high temperature.
- 2. The three-dimensional eccentric sealing system and the optimized design make the valve opening resistance small. The sealing surface of the butterfly plate is a cone-shaped convex one. When the valve is opened, all points on the circumference of the butterfly plate are separated from the sealing ring at the same time, so it is not easy for solids to accumulate on the sealing surface. The valve closing process is completed by the elastic compression of the sealing ring.
- 3. There is no phase jamming between butterfly plate and sealing ring.
- 4. The sealing performance of the valve is not affected by the temperature change.
- 5. The shaft diameter of the valve rod is sealed with graphite pressed seal ring. In conclusion, zero leakage is ensured. Metal seal plus zero leakage before, during and after fire proves that it is intrinsically safe.
Advantages of electric butterfly valve
- 1. The opening and closing is convenient, quick, labor-saving, low fluid resistance, and can be operated frequently.
- 2. Simple structure, small volume and light weight.
- 3. It can transport mud and store the least liquid in the pipe mouth.
- 4. Under low pressure, it can achieve good sealing.
- 5. Good regulation performance.