Butterfly valves are suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, the rigidity of the butterfly plate to withstand the pressure of the pipeline medium should also be considered when the butterfly valve is closed. In addition, the working temperature limitation of elastic seat material at high temperature must also be considered. The structure length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structure principle of the butterfly valve is most suitable for making large caliber valves. When the butterfly valve is required to control the flow rate, the most important thing is to select the correct size and type of butterfly valve so that it can work properly and effectively.
Usually, in the medium of throttling, regulating control and mud, the structure length is short and the opening and closing speed is fast (1/4 turn). Low pressure cut-off (low pressure difference), butterfly valve is recommended.
Butterfly valves can be used when there are two-position adjustments, shrinkage channels, low noise, cavitation and gasification, a small amount of leakage to the atmosphere and abrasive media.
When using butterfly valves under special working conditions such as throttling regulation, strict sealing, severe wear and low temperature (deep cold), special designed metal seal belt regulating device with special triple or double eccentric special butterfly valves should be used.