A relief valve is defined by its set pressure, its orifice and its capacity, not by its size alone. Farris valves carry those details on the nameplate and in the test record, which is why a photographed nameplate is worth more than a description.
Pilot-operated designs carry additional value because the pilot assembly is a substantial part of the cost. If the pilot is missing, say so, because the valve is then a body and a bonnet.
Brand disclosure. Farris 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 Farris or its owner. We do not provide manufacturer service, repair authorisation, calibration, pressure certification or product compatibility statements.
Inspection points
What decides the price
Nameplate
Set pressure, capacity, orifice designation, size and material. All of it is on the plate.
Pilot assembly
On pilot-operated valves, the pilot is the value. Keep it with the valve.
Records
Test and repair records, and any authorised repair shop documentation.
What to send
Making the review quick
A wide photograph of the whole unit, a close photograph of the valve nameplate, and the model number if you have it. If there are several identical units, one set of photographs and a quantity is enough.
If the equipment is already separated, keep the parts together and label them as a set. A matched pair is worth more than two orphans.
Questions sellers ask
Do you buy relief valves that are out of test?
Yes. Out-of-test valves are normal surplus, and we make no claim that any valve is fit for service.
What if the set pressure has been changed?
Tell us the current stamped setting. It is a fact, not a defect.