Parker D49V Series Proportional Valve | D49V004C4E91 D49V003C4N | NG25

LIC Hydraulic specializes in the Parker D49V Series, the premium choice for large-scale, pilot-operated proportional control. Engineered to NG25 / CETOP 08 specifications, the D49V series—including models such as D49V004C4E91 and D49V003C4N—delivers high-performance flow regulation up to $700\text{ L/min}$. With integrated onboard electronics (OBE) and high-resolution LVDT position feedback, these valves offer exceptional linearity and dynamic response. Designed to withstand working pressures up to $350\text{ bar}$, the Parker D49V series is the definitive solution for heavy-duty presses, metallurgical automation, and any large hydraulic power unit (HPU) requiring surgical precision.

Technical Highlights

• Massive Flow Capacity: Optimized internal geometries provide up to $700\text{ L/min}$, significantly reducing flow losses and heat generation in high-power circuits.

• Integrated Digital Electronics (OBE): Factory-calibrated controllers simplify installation and ensure consistent, interference-resistant control of the valve spool.

• LVDT Spool Feedback: Continuous monitoring of the main spool position ensures high repeatability and minimal hysteresis even under fluctuating load conditions.

• Robust Pilot Design: Features high-dynamic pilot stages to ensure fast response times for critical machine movements and shorter cycle times.

Application Areas

• Primary Manufacturing: Essential for large-scale injection molding, die-casting, and forging presses.

• Steel Industry: High-precision control for rolling mill actuators and furnace tilting mechanisms.

• Heavy Infrastructure: Proportional control for large mobile cranes and marine winch systems.

Expert Maintenance Tips

• Mandatory Filtration: Proportional valves are “silt-sensitive.” Maintain a fluid cleanliness level of ISO 18/16/13 to ensure the reliability of the precision pilot group.

• EMI Protection: Use shielded, twisted-pair cabling for all command and feedback signals to prevent electromagnetic interference from surrounding high-voltage equipment.

• Monitor Pilot Supply: Maintain a stable pilot pressure source. Fluctuations in the pilot line are the most common cause of “spool drift” or inconsistent response in the D49V series.