HOERBIGER PRL PIL Series Proportional Valve | PRL400PC06P18C1U24V | PRL500 PIL500

The HOERBIGER PRL / PIL Series from LIC Hydraulic is a high-performance proportional directional valve line designed for systems requiring precise speed and pressure control. Models like the PRL400PC06P18C1U24V feature sophisticated solenoid drive technology to ensure a linear relationship between input signal and hydraulic output. We guarantee 100% mechanical interchangeability and subject every unit to 100% hysteresis, frequency response, and $315\text{ bar}$ load testing, ensuring reliable operation in the most demanding industrial environments.

Technical Configuration Details

• Series Hierarchy: PRL400, PRL500 (Proportional), PIL400, PIL500 (Pilot Operated).

• Mounting Standard: NG6 (CETOP 03) / NG10 (CETOP 05) compliant.

• Voltage: $24\text{V DC}$ Proportional Solenoid (U24V).

• Max Pressure: Up to $315\text{ bar}$ ($4500\text{ psi}$).

• Hysteresis: Ultra-low, typically $\le 3\%$ for precise open and closed-loop control.

Key Technical Advantages

• Superior Dynamic Response: Engineered with low-friction internal components, the PRL series offers fast switching times, making it perfect for applications with high-frequency oscillation or rapid cycle times.

• High Linearity: Precision-ground spools ensure smooth flow curves and repeatable accuracy, which is essential for synchronous cylinder movements and delicate material handling.

• Rugged Proportional Design: Combines the precision of proportional control with the durability of standard directional valves, providing a reliable solution that is less sensitive to fluid contamination than traditional servo valves.

• High Power Density: The heavy-duty ductile iron housing allows for continuous operation at high pressures without body deformation, maintaining consistent control characteristics throughout the valve’s life.

Application Areas

• Forging & Stamping: Synchronized slide movement and pressure ramping in hydraulic presses.

• Plastics Industry: Precision control for mold closing and injection speed in blow molding machines.

• Wood & Paper Processing: Proportional tensioning and positioning of rollers and presses.

• Test Benches: High-accuracy speed regulation and load simulation circuits.

Expert Maintenance Tips

• Driver Calibration: Always use a compatible proportional amplifier. Fine-tuning the Dither settings on the electronic driver is critical for minimizing static friction and achieving the lowest possible hysteresis.

• Filtration Management: To preserve the precision-lapped surfaces of the spool and sleeve, maintain fluid cleanliness at ISO 4406 19/17/14 or better.

• Manifold Integrity: When mounting to a subplate, verify that the mounting surface is perfectly flat. Uneven bolting can warp the valve body, leading to spool sticking or degraded dynamic performance.