A butterfly check valve (also known as a dual-disc check valve or wafer check valve) is a type of non-return valve designed to prevent backflow in piping systems. It operates automatically, allowing fluid to flow in one direction while blocking reverse flow.
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Key Features:
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Compact Design – Uses a wafer-style body, making it lightweight and space-efficient compared to swing check valves.
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Dual-Disc Mechanism – Features two spring-loaded, hinged discs that open with forward flow and snap shut when flow stops or reverses.
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Fast Response – The discs close quickly under spring tension, minimizing water hammer and pressure surges.
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Low Pressure Drop – The streamlined disc design reduces flow resistance, improving efficiency.
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Versatile Installation – Can be installed horizontally or vertically (depending on design) and fits between standard flanges.
Advantages:
- No external controls needed – operates automatically.
- Durable with minimal maintenance.
- Suitable for high-flow, low-pressure systems.
Limitations:
- Not ideal for highly viscous fluids or slurries.
- May require sufficient flow velocity to fully open discs.
Butterfly check valves are widely used where space, weight, and efficiency are critical, offering reliable backflow prevention with minimal pressure loss.
