A butterfly disc used in wafer valves is lightweight and easy to install. This butterfly disc has a reduced thickness to fit between standard flanges. The alignment pins on a butterfly disc prevent misplacement during assembly.
A cast iron butterfly disc with nickel coating suits HVAC water loops. The disc stem of a butterfly disc is often square‑shaped for positive engagement. Butterfly discs for HVAC use have a rubber lining for quiet operation.
The disc of a butterfly disc can be made from aluminum bronze for seawater service. A coated butterfly disc resists galvanic corrosion in mixed metal systems. The disc face of a butterfly disc can be drilled for balancing holes.
A segmented butterfly disc uses a metal seat for high temperature applications. The eccentric movement of a butterfly disc reduces wear on the elastomer seat. Butterfly discs for food processing have a polished surface to prevent bacterial growth.
The disc thickness of a butterfly disc affects the valve’s face‑to‑face dimension. A spring‑loaded butterfly disc provides fail‑safe closure in vertical pipes. The disc stop of a butterfly disc prevents over‑travel beyond 90 degrees.
Butterfly discs with a Rilsan coating are used in potable water systems. A plastic butterfly disc (PVC, CPVC) is chemical resistant and low cost. The disc shape of a butterfly disc is often a truncated cone for better flow characteristics. Regular inspection of the butterfly disc ensures long valve life.
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