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Pressure control valves are common in both pneumatic and hydraulic circuits. In pneumatic circuits, pressure control valves are used primarily to regulate the source of air supply pressure to a control circuit but can also be used in branch circuits as an isolated source of energy for specific applications. Pressure control valves are also used to relieve access pressure as required.
Hydraulic pressure control valves are used to relieve pressure, reduce pressure, counterbalance a load, sequence the movements of actuators, unload a pump to low pressure, and act as a brake in decelerating and stopping motion.
Quality Hydraulics provides pneumatic pressure control valves from Ross Controls and Monnier, and hydraulic pressure control valves from ARGO-HYTOS, ALA/Yuken, HydraForce, Hydrolux, Moog, and Nachi Hydraulics.