Steven Levy Enterprises buys and sells new, unused, and used industrial surplus pilot relief valves. Browse our inventory of pilot relief valves available for purchase. Pilot relief valves are used for emergency relief during overpressure events. Pilot operated relief valves are held shut by piping a small amount of the fluid to the rear of the sealing disk, with the pressure balanced on either side. Tell us what surplus pilot relief valves you have for sale or call us at 713-910-4337.