Butterfly Type Slow-Closing Check Valve

Product Advantages

● Excellent Water Hammer Control: Slow-closing mechanism prevents pressure surges and pipeline vibration.
● Large Flow Capacity: Suitable for DN40–1400 long-distance or high-flow pipelines.
● Stable & Quiet Operation: Eliminates slamming noise during valve closing.
● Long Service Life: Durable disc, shaft, and seat design reduce wear.
● Pump Protection: Prevents reverse flow that can damage pumps or cause water hammer issues.

Size Range

● DN40 – DN1400

Pressure Rating

● PN10 / PN16

Standards

● Design Standard: EN 1074 / EN 12032
● Test Standard: EN 12266
● Flange Standard: EN 1092-2

Industry Applications

● Municipal water supply and distribution pipelines
● Booster pump stations and water plants
● Long-distance water transmission lines
● Irrigation and agricultural pipeline systems
● Industrial circulation and cooling loops
● Sewage & wastewater pipelines

FAQs

1. How does the damping mechanism actually prevent water hammer?
Instead of letting the disc slam shut the instant flow reverses, the built-in damper controls the closing speed so the disc reaches its seat gradually — this gives the fluid column time to decelerate smoothly rather than stopping abruptly, which is what generates the pressure spike known as water hammer.

2. What’s the difference between this valve and the Non-Slam Slow-Closing Check Valve in your catalog?
Both target the same water hammer problem, but the disc geometry differs — a butterfly-disc design like this one suits larger, high-flow lines efficiently, while a non-slam design may use a different disc or damping arrangement better suited to a different size or pressure range. Confirming which platform fits your specific line size and flow rate is worth a direct comparison before ordering.

3. Why is this valve rated up to DN1400 when many check valves top out much smaller?
The butterfly disc structure keeps pressure loss low even at large diameters, which is why it’s specified for long-distance water transmission and large pump station discharge lines where a swing or lift check valve of the same size would create more resistance and take up more installation length.

4. Can this valve be installed vertically, or only horizontally?
Both orientations are supported — horizontal or vertical installation — which gives more flexibility in pump station layouts where pipe routing doesn’t always allow a horizontal run at the check valve location.

5. Does the damping mechanism require separate maintenance from the valve body?
The damping system is built into the valve rather than being a separate add-on component, so routine maintenance generally follows the same schedule as the valve itself — but it’s worth confirming with the specific model’s manual whether the damper uses any wear parts (like hydraulic fluid or a spring) that need periodic inspection.