Check Valve Types Explained: Swing, Lift, Dual Plate & Wafer
A check valve does one job — let flow through in one direction and block it in the other — but there are several distinct mechanisms for doing that, each suited to different pipe orientations, pressure conditions, and space constraints. Jaideo Automation supplies an extensive check valve range including bronze swing check valves, cast iron horizontal lift check valves, dual plate check valves, and wafer disc check valves.
Swing Check Valves
A swing check valve uses a hinged disc that swings open with forward flow and swings shut under reverse flow or gravity. It’s the traditional, widely used design for horizontal pipe runs, available in bronze, cast iron, and cast steel depending on the pressure rating and media.
Lift Check Valves
A lift check valve uses a disc that lifts straight up off its seat with forward flow and drops back down to seal against reverse flow, guided in a vertical channel. Available in horizontal and vertical/right-angle configurations, lift check valves generally seal more tightly than swing types and are common in steam and higher-pressure applications.
Dual Plate (Wafer) Check Valves
A dual plate check valve uses two spring-loaded half-discs hinged on a central pin, both swinging open with flow and snapping shut together when flow reverses. Because the whole assembly is compact and lightweight, dual plate valves fit in a wafer body sandwiched between pipe flanges — a much smaller footprint than a swing check valve of the same line size, which matters where space is tight.
Comparison
| Swing Check | Lift Check | Dual Plate (Wafer) | |
|---|---|---|---|
| Orientation | Horizontal (typically) | Horizontal or vertical | Horizontal or vertical |
| Footprint | Larger | Moderate | Compact (wafer body) |
| Sealing | Good | Very good | Good, fast-closing |
| Common use | General water/plumbing lines | Steam, higher-pressure lines | Space-constrained installations, pump discharge |
Material Selection
Beyond mechanism type, check valves are available in bronze, cast iron, cast steel, and forged steel — material choice depends on the media, pressure rating, and whether the application requires a boiler/pressure-vessel code approval. Higher-pressure steam and industrial applications typically call for cast or forged steel rather than bronze or cast iron.
Where Check Valves Fit
Check valves prevent backflow at pump discharge, protect equipment from reverse flow, and are a standard requirement wherever flow direction must be guaranteed one-way — boiler feed lines, pump systems, and water distribution networks. For the full valve selection picture, see our Industrial Valve Selection Guide.
Frequently Asked Questions
What is the difference between a swing check valve and a lift check valve?
A swing check valve uses a hinged disc that swings open and shut, while a lift check valve uses a disc that lifts vertically off its seat, generally providing tighter sealing and suiting higher-pressure applications like steam lines.
Why choose a dual plate check valve over a swing check valve?
Dual plate check valves are more compact, fitting in a wafer body between pipe flanges, which makes them suited to space-constrained installations where a swing check valve’s larger footprint doesn’t fit.
What material should a check valve be made of?
Material choice depends on the media and pressure rating: bronze and cast iron suit general water and plumbing lines, while cast or forged steel is typically required for higher-pressure steam and industrial applications.