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A butterfly valve, another type of quarter-turn valve, is named for the wing-like action of the flow-controlling disc inside the valve. The flat, circular disc is mounted on a rod which is connected to a handle or actuator which is used to turn the disc either parallel or perpendicular to the flow of fluid. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to regulate flow. It operates similar to a ball valve, however, the disc is always present within the flow of fluid, causing a slight pressure drop regardless of it's position. Butterfly valves have relatively easy maintenance due to the small number of moving parts.
Standard Sizes
1 1/2" - 40" diameter
Sizes and materials are brand specific. Click on a manufacturer below for available products. Please contact Aetna Plastics for pricing information.
Corrosion Guide for Common Piping Materials and Seal Elastomers (PDF)
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Manufacturers
Asahi/America
- Size Range: 1 1/2" - 40"
- Materials: PVC, PP, PVDF, PDCPD and PTFE Lined
- Products: Type 55, Type 57, Type 57L Lug Guard®, Type 75, Pool-Pro®, PDCPD Giant Butterfly Valves
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Cepex
- Size Range: 2" - 12"
- Materials: PVC and PP
- Products: Industrial Series, Standard Series, Classic Series
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+GF+
- Size Range: 2" - 16"
- Materials: PVC, CPVC, PP, PVDF, PFA and PTFE Lined
- Products: Butterfly Valve Type 567-568 , Butterfly Valve Type 365, Electrically Actuated Butterfly Valve Type 140, Pneumatically Actuated Butterfly Valve Type 240, Pneumatically Actuated Butterfly Valve Type 242,
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Hayward
- Size Range: 1 1/2" - 24"
- Materials: PVC, CPVC, PP and PVDF
- Products: BY Series Butterfly Valves, BYB Series Industrial Butterfly Valves
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Spears
- Size Range: 1 1/2" - 24"
- Materials: PVC, CPVC and PP
- Products: Standard Butterfly Valves, True Lug Butterfly Valves, PP Butterfly Valves
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