Double shafts Lug butterfly valves have threaded inserts at both sides of the valve body. This allows them to be installed into a system using two sets of bolts and no nuts.
The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side.
Lug butterfly valves with double shafts used in dead end service generally has a reduced pressure rating. Lugged valves are extremely resistant to chemicals and solvents and can handle temperatures up to 150?C, which makes it a versatile solution.