Spring-loaded relief valves come in conventional and balanced bellows designs, the latter used where back pressure varies or where the discharge must be isolated from the bonnet. Consolidated builds both, and both appear in plant stores after a turnaround.
The practical review points are the set pressure, the orifice, the inlet and outlet sizes, the body material and whether the bellows is intact on a balanced design. A damaged bellows is a repair, not a rejection.
Brand disclosure. Consolidated 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 Consolidated or its owner. We do not provide manufacturer service, repair authorisation, calibration, pressure certification or product compatibility statements.
Inspection points
What decides the price
Bellows condition
On balanced designs, the bellows is the first thing to check and the first thing to photograph.
Orifice designation
The letter designation defines capacity and is stamped on the valve.
Inlet and outlet
Flanged or threaded, and the size of each. Mismatched ends are common on surplus.
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 valves with damaged bellows?
Yes, at a reduced price, because the bellows is replaceable.
Are relief valves from a turnaround purchased as a lot?
Yes, and that is the usual form. Send the list with set pressures if you have them.