Butterfly Valve In Piping
In term of flanged connection, manual butterfly valve have lug type and wafer type. We commonly use Wafer type.
Material of Lug-style butterfly valves are usually of metal such as ductile iron or steel. They feature threaded tapped lugs positioned on the valve flanges for bolt connections.
Lug-style butterfly valves are suitable for end-of-line service but a blind flange is always recommended. Lug-style butterfly valves are manufactured to be compatible with either pneumatic or electric actuation. Hence, Disc and seat material should be determined based on application and flow media.
Most wafer-style butterfly valves have four holes that align with the connected pipeline. The valve is designed to clamp between two flanges in your pipe work. Most wafer butterfly valves fit the majority of flange standards. The rubber or EPDM valve seat creates an exceptionally strong seal between the valve and flange connection.
Unlike lug-style butterfly valves, we cannot use wafer-style butterfly valves as pipe ends or end-of-line service. We must shut down the entire line if either side of the valve requires maintenance. Wafer style butterfly valves are manufactured to be compatible with either pneumatic or electric actuation. We determine disc and seat material based on application and flow media.
Both type can be lever operated and gear operated butterfly valve.
Based on most project specification and user experience, we use lever operated valve type for DN 125 and below. And we use gear operated type for DN150 and above.