Parker D31FHE Series Directional Valve | D31FHE01A4NB00 | D31 D41 D91 Pilot Operated Valve

LIC Hydraulic’s Parker D31FHE Series represents the pinnacle of pilot-operated directional control valve technology. As an integral part of Parker’s industrial valve platform (including D1, D3, D31, D41, D81, and D91 series), the D31FHE01A4NB00 and D31FHE01C4NB00 are engineered for precision, high dynamic response, and extreme durability. These valves are designed to manage large flow rates with minimal pressure drop and precise spool control. We offer 100% drop-in interchangeability with original Parker units. Every valve undergoes 100% dynamic performance testing to guarantee zero-drift operation and high switching frequency in the most demanding industrial applications.

Technical Specifications

• Model Code: D31FHE01A4NB00 / D31FHE01C4NB00

• Size: NG10 (CETOP 05)

• Type: Pilot Operated Directional Control Valve

• Pilot Stage: Solenoid-controlled (E-series)

• Spool Type: 01 (Type E/C Spool functions)

• Max Operating Pressure: P, A, B Ports: 350 bar (5075 psi) / Tank Port: 210 bar

• Max Flow Rate: Up to 150 L/min (39.6 gpm)

• Seals: NBR standard (Viton available for high-temp applications)

• Mounting Interface: ISO 4401-05-04-0-05

• Voltage: Standard DC/AC coil options available

Key Technical Advantages

• Dual-Stage Performance: The high-sensitivity pilot stage drives the main spool effortlessly, ensuring smooth transitions and precise positioning even at maximum system pressures.

• Precision Ground Spool: Spools are machined with flow-compensation notches to provide linear metering and excellent feathering capabilities, reducing hydraulic shock.

• Heavy-Duty Solenoid Design: Industrial-grade coils are built for continuous duty, featuring excellent heat dissipation and consistent magnetic force under high cycling rates.

• Universal Compatibility: The D31-D91 series shares a modular platform, allowing for easy integration and simplified spare parts management across diverse machine fleets.

Application Areas

• Metal Forming: Hydraulic presses, bending machines, and heavy-duty stamping equipment.

• Steel & Mining: Rolling mill adjustment systems, continuous casting machines, and conveyor tensioning.

• Plastic & Rubber: Large-scale injection molding machine clamping and injection units.

• General Industrial: Automated assembly lines, hydraulic power units, and complex actuator control systems.

Expert Maintenance Tips

• Filtration Standard: The pilot stage is highly sensitive to particulate matter. Maintain fluid cleanliness at ISO 17/15/12 or better. High-quality 5-micron filtration is strongly recommended.

• Pilot Oil Stability: Ensure the pilot pressure supply is stable and free from spikes. Fluctuations in pilot pressure can cause inconsistent spool response times.

• Drain Line Integrity: If using an external drain, ensure the line returns directly to the reservoir with zero back-pressure. Excessive back-pressure on the drain port will degrade the valve’s dynamic response and seal life.