Butterfly valve include wafer type butterfly valve and lug style butterfly valve. The valve body and disc material is ductile iron or cast gray iron.
PN10/PN16 Pressure rate
Size: DN50 – DN600;
100% hydraulic pressure testing;
Epoxy coating or primer painting.
Lug Style Butterfly Valve
EPDM/NBR/VITON valve seat;
Cast iron handle/lever operation or gearbox.
Lug-style 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.
A lug-style butterfly valve used in dead end service generally has a reduced pressure rating. For example a lug-style 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.
Cast iron valve include gate valve, butterfly valve, check valve, strainer and ball valve. The body material is cast gray iron or ductile iron.