Butterfly Valve Body Construction:

Butterfly valve body construction varies. The mainly economical is the wafer categories that fit among two pipeline flanges. Another category, the lug wafer design, is held in place among two pipe flanges through bolts that join the two flanges and pass by holes in the valve's outer casing. Butterfly valves are available along with conventional flanged ends for bolting to pipe flanges and within a threaded end construction.