Butterfly valves are lightweight and resemble a butterfly wing. It comes in one- or two-piece designs. Valves with a one-piece design will have a disk placed on a shaft that rotates a pipe. A two-piece valve allows full flow with the sections held inward and lies flat as it gets closed. Butterfly valve manufacturers in India design two different types of butterfly valves, namely:
Lug valves: Lug valves are used for applications that require temporary fixtures. It uses threaded metals as inserts to hold the bolt of the valves. Hence, nuts are not required. A set of bolts secures both sides of the flange. Such a design offers more flexibility as you can leave one side of the piping system untouched and still disconnect the other side.
Wafer valves: Wafer valves are standard valves installed with nuts, studs or bolts between two flanges. It is less expensive than lug valves and is an excellent option if you do not want to disconnect a side of the piping system.