In stormwater systems, a swing check valve prevents floodwater from backing into streets. This swing check valve typically has a larger body to pass debris without jamming. The disc of a swing check valve in drainage is often made of lightweight plastic.
A rubber‑lined swing check valve resists corrosion from road salts and chemicals. The hinge of a swing check valve must be oversized for continuous dirty water service. During heavy rain, a swing check valve opens fully to minimize pressure drop.
Many cities install a swing check valve at outfall points into rivers. A duckbill valve is sometimes replaced by a swing check valve for easier maintenance. The access cover on a swing check valve allows cleaning of the seating area.
A stainless steel swing check valve is used in seawater outfalls. The flapper of a swing check valve can be fitted with a wear‑resistant coating. For deep pits, a swing check valve with an extended stem is available.
When a pump turns off, the swing check valve closes before reverse flow occurs. A counterweight on a swing check valve adjusts the cracking pressure. Without a swing check valve, pump houses would flood during power outages.
The seat of a swing check valve is vulnerable to debris accumulation. Regular cleaning of a swing check valve prevents leaks. A clear PVC swing check valve is used for visual inspection of flow. For critical applications, a dual swing check valve provides redundancy. Overall, the swing check valve is a robust choice for drainage networks.
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