Butterfly valves are suitable for flow regulation. Since the pressure loss of the butterfly valve in the pipeline is relatively large, it is about three times that of the gate valve. Therefore, when selecting the butterfly valve, the influence of the pressure loss of the pipeline system should be fully considered, and the strength of the butterfly plate to withstand the pressure of the pipeline medium should also be considered when it is closed. In addition, it is necessary to consider the limitation of the working temperature of the elastic seat material at high temperature.

The valve can be installed on the flange only after the flange is welded to the pipe and cooled to ambient temperature. Otherwise, the high temperature generated by welding will affect the performance of the elastic valve seat.