Butterfly valve owns simple and compact structure with light weight. It can be easily and quickly operated by a 90° rotation. In addition, it has good performance on fluid control. The thickness of disc is the only resistance when the valve is in fully open condition, thus the flow resistance of butterfly valve is very small and can cause a minimum pressure loss to application. Due to its characteristic structure, butterfly valves are more suitable for large diameter valves. They are widely used in oil & gas, water treatment, petrochemical, as wells as thermal power station’s cooling water system.

There are metal to metal sealing and soft sealing for butterfly valves. Although it does not has sealing performance as good as soft seal, metal to metal sealing butterfly valve can work in wider temperature range and application with particulates. Also, in terms of connection type, butterfly valves can be divided into wafer type butterfly valve and flanged butterfly valve.

In conclusion, butterfly valves have advantages of good sealing performance, light weight, convenient operation, wide and flexible applicability, relatively lower cost and so on.