Pressure Reducing Proportional Valves

Parker’s proportional pressure reducing valves provide electronically variable reduced pressure to protect system components and assist in force and torque control. Pressure reducing relieving valves are of spool-type design and consist of an inlet port, a reduced pressure port, and a tank port. Varying coil current will create a proportionally lower output pressure in the reduced pressure port when supplied a higher pressure at the inlet port. When no current is applied the reduced pressure port is vented to tank and the inlet port is blocked by the spool. Once current is applied the spool shifts and meters flow from the inlet port to the reduced pressure port and maintains a constant pressure at the reduced pressure port. Higher current results in a higher reduced pressure. The reduced port pressure is relieved to tank if it exceeds the valves input command pressure. AC and DC coil options are available, along with a wide range of connection types. Current Controlled Pulse Width Modulation (PWM) valve drivers are preferred as they adjust for variations in coil temperature and also provide the ability to apply a dither frequency.

Combined with Parker’s wide range of Coil options, proportional pressure reducing / relieving valves allow for application specific solutions in the most demanding applications and markets including: Power Units, Oil and Gas, Material Handling, Construction, Drills, Presses, Mixers, Agriculture, Balers, Combines, Double Acting Cylinder Control, Bi-Direction Motor Control, Circuit Selectors, Skid-Steers, etc.