A butterfly valve is a type of quarter-turn valve that controls the flow of a product in a pipeline.
Butterfly valves are usually grouped into two types: lug-style and wafer-style. These mechanical components are not interchangeable and have distinct advantages and applications. The following guide explains the differences between the two butterfly valve types and how to select the right valve for your needs.
Lug-style butterfly valves are usually composed 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.
Most wafer-style butterfly valves are engineered with 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, wafer-style butterfly valves cannot be used as pipe ends or end-of-line service. The entire line must be shut down if either side of the valve requires maintenance.
Post time: May-18-2022
