Butterfly Valve Types: Wafer, Lug, Flanged

The butterfly valve is the most commonly used shut-off element in mechanical installations: compact, lightweight, and relatively economical. There are three main variants based on the connection type.

Wafer Type is sandwiched between two flanges. It is the most compact and economical option, but since the body is not held by bolts, it cannot be used at the end of the line — if you open the valve and disassemble one side, the compression is lost.

Lug Type features lugs on the body that allow it to be bolted from one side. This means that it is possible to drain one side of the line for servicing. It is therefore chosen for applications such as pump inlets and equipment isolation.

Flanged Type has a fully flanged body; it is used for larger sizes and higher pressure classes.

Additionally, attention must be paid to the valve (disk) and sealing material: nickel-coated and stainless steel valve options are for different environments, while the seat material (e.g., EPDM) determines the working temperature and type of fluid. In our catalog, wafer and lug vulcanized models are available up to PN16, and wafer butterfly valves are available up to PN25; actuator versions (electric or pneumatic) range from DN40 to DN600.

Butterfly Valve Types: Wafer, Lug, and Flanged

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