A plug valve rotates a cylindrical or tapered plug with a rectangular port through the body. The design handles slurries, viscous products and services where solids would damage a ball or seat, and it can be lubricated or sleeved for difficult chemistry.
Plug valves are standard in chlor-alkali, sulphur, polymer, pulp and heavy chemical service. Eccentric plug valves are used for throttling dirty water and wastewater. Because they are usually specified for the hardest service in a plant, they are often alloy or lined, which makes surplus plug valves disproportionately valuable.
We buy plug 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 | Lubricated tapered plug, Sleeved non-lubricated plug, Eccentric plug for throttling, PTFE and PFA lined |
|---|---|
| Typical service | Chlor-alkali, Sulphur and acid service, Polymer and slurry |
| What we look at | Body material, lining, plug material, port configuration and operator are the core facts. We also ask whether the plug turns and whether the sleeve is intact, because a sleeved plug valve with a damaged sleeve is a re-sleeve job rather than a spare. |
| What to keep | Keep the plug, the sleeve and the cover. A plug valve without its plug is a shell. Keep the lubricant fitting caps and the gear operator if fitted, and do not force a seized plug out with a hammer: it usually cracks the sleeve. |
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 plug, the sleeve and the cover. A plug valve without its plug is a shell. Keep the lubricant fitting caps and the gear operator if fitted, and do not force a seized plug out with a hammer: it usually cracks the sleeve.
Where they come from
Industries and services
- Chlor-alkali
- Sulphur and acid service
- Polymer and slurry
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
Other valve types
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Read →Questions sellers ask
Do you buy lined plug valves from acid service?
Yes, and they are one of the better categories in the region. Lined bodies in PTFE, PFA and rubber hold value even with worn plugs, because the body is the expensive part.
The plug is seized. Is it scrap?
Usually not. A seized plug is a maintenance problem, not necessarily a metallurgical one. Tell us how it was stored and whether it was flushed before removal.
Can you take a mixed lot of plug and ball valves?
Yes. Mixed lots are what we expect from a crib. Send the list as it stands rather than separating by type.