A swing check holds a hinged disc on a pin above the flow path. Forward flow lifts the disc; reverse flow seats it against the body. The design tolerates dirty water better than a wafer check and can be serviced through a bolted cap.
Swing checks sit on pump discharges and header isolation in water, wastewater, fire protection and terminal piping. Large sizes are common, and large sizes are where the value is: a twenty-inch swing check is an expensive casting that is worth recovering.
We buy swing check valves in any quantity — single items, mixed pallets or whole cribs, including valves that need repair and assemblies that are missing parts. We do not require a clean inventory before reviewing a list.
| Common patterns | Bolted cap, screwed cap and full body, Cast iron, ductile iron and carbon steel, Stainless and alloy trim, Lever and weight assisted |
|---|---|
| Typical service | Pump stations, Water and wastewater, Fire protection |
| What we look at | Size and class first, then body material and trim. We look at whether the disc seats cleanly, whether the hinge pin is worn, and whether the flange faces are undamaged. Flange damage is the most common reason a large check valve is rejected. |
| What to keep | Keep the cap, the disc and the hinge pin. A swing check with the cap removed and the disc lost is still a body, but a complete one is a valve. Photograph the seat through the cap opening if you can. |
Patterns and variants
What turns up most often
Variants matter because they change the buyer pool. A standard pattern sells to a rebuilder or a plant with the same service; a specialised trim sells to a much smaller group but often at a higher price. If you are unsure which variant you have, the nameplate or the trim marking will usually say.
Before it leaves site
How to protect the value
Keep the cap, the disc and the hinge pin. A swing check with the cap removed and the disc lost is still a body, but a complete one is a valve. Photograph the seat through the cap opening if you can.
Where they come from
Industries and services
- Pump stations
- Water and wastewater
- Fire protection
Most of the surplus we see comes from plants that have replaced equipment for a reason that has nothing to do with the valve: a unit was re-rated, a line was re-piped, a control loop was upgraded or a project was re-scoped. The valve is simply the part that has to move.
Related patterns
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Read →Questions sellers ask
Do you buy very large swing checks?
Yes. Anything from fourteen inch upward is worth a conversation, particularly in cast iron or ductile iron for water service. Logistics are the main question, not interest.
The disc is missing. Is that a problem?
It reduces the value but the body still sells to a rebuilder. Tell us what is missing rather than describing it as complete.
Can you collect from a pump station?
Yes. We arrange collection from sites across the three states, and we can work around plant access requirements.