Masoneilan built its reputation on rotary control valves, above all the Camflex eccentric rotary plug, alongside a broad globe valve range and a family of pneumatic and digital positioners. The brand's equipment is common in refineries, chemical plants and power stations where a compact rotary valve was preferred to a globe body.
Masoneilan surplus tends to be complete and identifiable, because the equipment was usually specified with full documentation. Camflex bodies with their actuators and SVI positioners are the most requested items; older pneumatic positioners are bought for spares.
Brand disclosure. Masoneilan is a trademark of its respective owner. Louisiana Valve Buyer is an independent purchaser of surplus equipment and is not affiliated with, authorised by, sponsored by or endorsed by Masoneilan or its owner. These pages describe equipment we are willing to buy; they do not represent manufacturer service, repair authorisation, calibration, pressure certification, product compatibility, or a statement that any used item is ready for future process service.
Seller guides
Masoneilan equipment, in detail
What we look at
Reviewing Masoneilan equipment
Body and plug
Check the plug for erosion at the seat line and the body bore for wash. A worn plug is normal; a washed body is not.
Seat ring
The clamped seat ring is replaceable but must be present, because a missing ring means a missing part that is hard to source.
Actuator interface
Standard yoke and stem dimensions make these easy to re-actuate. Note the actuator model and the air failure direction.
A detailed, accurate list is more useful than a generic brand mention. If you can tell us the model, the size, the class and what is attached, the review is straightforward. If you cannot, photographs of the nameplates will get us most of the way.
What to preserve
Before anything is disconnected
Keep the assembly together, keep the tag on the valve, and photograph the nameplates before anything is separated. Most of the value lost on branded equipment is lost in the ten minutes after removal, not in the years before it.
Questions sellers ask
Do you buy used Masoneilan equipment?
Yes. We buy Masoneilan equipment as surplus, in single lots or as part of a whole crib. We buy it as equipment, not as scrap, and we make no claim about its fitness for future service.
Is Masoneilan surplus worth more than unbranded equipment?
Often yes, because the brand tells a buyer what the specification is and where parts come from. The premium depends on the model, the condition and the documentation.
What if the nameplate is missing?
Send photographs of the body and any cast markings. Brand and model can often be established from the shape and the marking, though the price reflects the uncertainty.