The lug butterfly valve is somewhat similar to a 3-piece ball valve where one end of the wire can be removed without affecting the opposite side. Lug butterfly valve can be done by using threaded inserts, flanges and two sets of lugs that do not use nuts, as each flange has its own bolt. Lug butterfly valve is thus convenient to clean, inspect, repair or replace the lug butterfly valve because you do not need to shut down the entire system.