Seawater butterfly valves 
Butterfly Valves are operated by turning a handwheel, this handwheel connects to a shaft and disc which is rotated to 90 degrees to fully open the valve. A fully opened butterfly valves disc is edge on obtaining a low resistance to the liquid (seawatwer)
Butterfly valves alow a bigger pipelines to be regulated and are usually more cost effective when compared to gate and globe valves.
Aluminium bronze Butterfly valves have the following benefits, 90 degree operation, light weight, low head loss and are easily maintained
Butterfly valves are ideal for regulating (throttling) the flow of liquids and when frequent operation will be required.
Butterfly valves can have flanged ends which are drilled according to
The ideal material for seawater is Nickel Aluminium Bronze because of its excellent corrosion fatigue and galvanic corrosion in comparason to austenitic and duplex stainless steel