Knife Gate Valve
(16)
Gate Valve
(19)
Ball Valve
(15)
Check Valve
(15)
Globe Valve
(14)
Butterfly Valve
(15)
Cryogenic Valve
(3)
Plug Valve
(2)
Lug type 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 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.
A lug type butterfly valve used in dead end service generally has a reduced pressure rating. For example a lug type butterfly valve mounted between two flanges has a 150 psi pressure rating. The same valve mounted with one flange, in dead end service, has a 75 psi rating.