Rexroth ZDB Series Pressure Relief Valve Replacement | ZDB6VP High-Pressure Hydraulic Valve

Genlu Hydraulic proudly introduces our industrial-grade ZDB Series stackable pressure relief valves. Fully engineered to match Rexroth global standards, this series provides a high-performance, seamless drop-in replacement for industrial hydraulic circuits requiring precise pressure control and safety relief. We specifically highlight our supply capability for precision-tuned units such as the ZDB 10 VP2-4X/315V, ZDB6VP-2-4X/100, and ZDB6VP1-4X/350.

The ZDB series is the gold standard for stackable relief valves, celebrated for elite spatial efficiency, rapid response times, and rugged pressure-bearing capabilities. Genlu guarantees 100% Drop-in Interchangeability across stackable footprints (ISO 4401), O-ring port configurations, and pressure-regulation characteristics compared to original Rexroth ZDB assemblies. Every valve undergoes 100% pressure-overflow stability and dynamic response testing on our digital test benches, certifying precise pressure protection for your hydraulic systems.

Technical Specifications 

• Product Series: Rexroth ZDB Series Stackable Pressure Relief Valve

• Representative Models: ZDB 10 VP2-4X/315V, ZDB6VP-2-4X/100, ZDB6VP1-4X/350

• Nominal Size: NG6 (ZDB6) / NG10 (ZDB10)

• Max Operating Pressure: 315 bar / 350 bar (Model-dependent)

• Max Flow Rate: 60 L/min (NG6) / 100 L/min (NG10)

• Control Method: Manual Handwheel with Locking Nut

• Mounting Configuration: Stackable (ISO 4401 Compliant)

• Fluid Compatibility: Mineral oils per DIN 51524

Key Technical Advantages:

• High-Precision Response: Equipped with elite-grade compensation springs and precision-engineered spools that provide rapid, stable cracking performance, effectively eliminating pressure-overshoot in critical loops.

• Seamless Structural Compatibility: Designed for standard stackable configurations, allowing users to integrate these valves into existing hydraulic manifolds without structural modifications—a true “plug-and-play” replacement.

• Seal Integrity & Reliability: Precision-lapped sealing surfaces paired with high-performance Fluorocarbon (FKM) O-rings ensure leak-free operation, even under heavy-duty, high-frequency pressure-cycling cycles.

• Elite Impact Resilience: Manufactured from high-strength alloy steel with vacuum-heat treatment, these valves are resilient against sudden hydraulic-shock transients, extending service life in demanding industrial environments.

Application Areas:

• Machine Tool Hydraulics: Pressure regulation and safety overflow for grinders, milling machines, and CNC centers.

• Injection Molding Machinery: Stable pressure loop control and sequence management for hydraulic actuators.

• Mobile & Agricultural Machinery: Pressure setting for auxiliary hydraulic circuits in cranes and excavators.

Expert Maintenance Tips:

• Adjustment Best Practices: Always loosen the locking nut before making pressure adjustments. Retighten immediately after setting to prevent pressure drift caused by vibration. Never force the adjustment handwheel when system pressure is at peak levels.

• O-Ring Replacement: Wear-and-tear on interface O-rings is the most common cause of leakage. Perform annual inspections of the four mounting interfaces and replace seals with high-grade FKM equivalents to ensure long-term integrity.

• Contamination Prevention: Relief valves are highly sensitive to particulate debris. If pressure fluctuates erratically or regulation fails, inspect the spool for metallic shavings or contaminants before attempting further mechanical adjustments.