A Butterfly Slow Closing Check Valve is a specialized type of check valve designed to prevent reverse flow in pipeline systems while eliminating water hammer through controlled, gradual closure. It combines the compact design of a butterfly valve with an integrated hydraulic damping mechanism to ensure smooth, shock-free operation under varying flow conditions.
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Key Features:
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Butterfly Disc Design: Features a single, lightweight disc rotating on a central shaft. The disc opens fully with forward flow, minimizing pressure drop.
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Hydraulic Damping System: Integrated dashpot (oil/gas chamber) regulates disc closure speed during flow reversal. Closure time is adjustable (typically 3-60 seconds), decoupling it from flow velocity.
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Spring Assistance: A torsion spring ensures positive initial disc movement towards closure upon flow reduction or reversal.
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Silent & Shock-Free Closure: The controlled slow-closing action prevents sudden pressure surges (water hammer), protecting pumps, pipes, and fittings.
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Compact & Lightweight: Offers significant space and weight savings compared to traditional swing check or lift check valves.
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Low Pressure Drop: Full-port design and unobstructed flow path minimize energy loss when fully open.
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Multiple Mounting Options: Suitable for horizontal or vertical installation (flow direction must be upward in vertical pipes).
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Position Indication: Often includes visual open/closed position indicators (optional).
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.
