Check Valve Types: Comparing Disc, Swing, and Wafer Designs

25.08.2026

Mechanical safety devices that allow fluid to flow in only one direction and automatically block reverse flow in industrial processes are called check valves (non-return valves). Check valves protect pump systems, compressors, and sensitive measurement instruments from backpressure shocks. The most commonly used check valve types in industry are disc, swing, and wafer designs.

1. Swing Check Valve

Swing check valves operate on the principle that a disc, hinged on a pin inside the body, lifts upward under flow-direction pressure:

• Low Flow Resistance: When the disc fully opens, it swings out of the flow section, producing minimal pressure loss along the line.
• Suitable for Particle-Laden Fluids: Thanks to its generous internal volume, it operates without clogging on fibrous or lightly particle-laden fluids.
• Installation Orientation: Primarily used on horizontal pipelines. On vertical lines it can only work where flow travels upward.

2. Disc (Spring-Loaded) Check Valve

In disc check valves, the disc is supported by a guide stem parallel to the flow axis and a stainless steel spring mechanism:

• Positive, Fast Closing: The instant flow stops, the spring mechanism presses the disc firmly onto the seat, ensuring fast closure without backflow.
• Installation Flexibility: Thanks to the spring force, it works safely on horizontal, vertical, or angled pipelines regardless of orientation.
• Water Hammer Prevention: The fast spring response closes the disc before reverse flow gains speed, preventing hydraulic shocks.

3. Wafer-Type (Dual-Plate) Check Valve

Wafer check valves, sandwiched between two flanges with a thin disc or a hinged dual-plate design, stand out in modern facilities:

• Compact, Lightweight Design: Offers up to roughly 80% space and weight savings compared to traditional flanged swing check valves.
• Low Installation Cost: Fits easily between two standard flanges with bolts, without requiring extra flange welding.
• Efficiency at Large Diameters: Its light weight reduces static load on pipe supports in large pipelines.

Choosing the Right Check Valve Type

In power plants, iron and steel, chemical plants, and paper mills, disc check valves or wafer-type dual-plate models are often preferred on pump discharge lines to minimize water hammer risk. On clean-water and high-flow main transmission lines, flanged swing check valves that offer minimum pressure drop stand out.