Priority Pressure Compensators FCPH121F04V

Compensator valves are used to provide pressure compensated control across an external fixed or adjustable orifice, providing constant flow regardless of upstream or downstream pressure changes.

Parker offers two styles of Priority Pressure Compensators, ranging in flows from 10 to 20 gallons per minute, and pressure capabilities of 3500 psi and 5500 psi. Flow through the external orifice (fixed or variable) enters the supply port and produces a pressure drop across the compensator spool. When the inlet pressure exceeds the initial setting of the valve, the force produced by the pressure differential across the spool exceeds the spring force and shifts the compensator spool to throttle, or restrict, the flow, thus maintaining constant flow through the priority port. The excess flow is bypassed out to the system to be used by another function, or back to the system reservoir. Flow out the regulated port must be maintained for bypass flow to continue. For this reason, common practice dictates a pressure control (relief) be installed in the priority line.

Parker offers the following styles of Priority Pressure Compensators:

FCP101 - Up to 10 gallons per minute priority flow rate (38 lpm), 15 gallon per minute maximum inlet flow (56 lpm), 3500 psi. Available with differential pressure settings of 40, 80, and 160 psi. Nitrile and Fluorocarbon seals available.

FCPH121 - Up to 20 gallons per minute priority flow rate (75 lpm), 25 gallons per minute maximum inlet flow (95 lpm), 5500 psi. Available with fixed (customer specified) or variable differential pressure settings. Adjustments are knob or screw adjust, with a tamper resistant cap available.

Priority Pressure Compensators are used where the design calls for constant flow to a particular segment of the circuit, regardless of upstream or downstream pressure (load) changes. A common application is for speed control on a conveying system. Should the load on the conveyor increase, the pressure increases at the compensator and the valve modulates to maintain the desired pressure differential across the valve. This modulation allows more flow to pass through the valve thus maintaining a constant desired speed. Conversely, should the load on the conveyor decrease, the opposite happens and the compensator modulates, restricting some flow to maintain the desired pressure differential, thus providing constant speed.

Parker Priority Pressure Compensators may be found in steering circuits, conveying systems, lift/lower systems in markets such as mobile/agricultural companies, steel or lumber mills, or off-highway mobile equipment.

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