Rexroth ZDRE Proportional Pressure Reducing Valve

The Rexroth ZDRE Series is an industrial-grade, direct-operated 3-way proportional pressure reducing valve engineered in a space-saving sandwich plate configuration. Positioned as a premier solution for modular stacking assemblies, the ZDRE series allows machine designers to reduce and control the operating pressure of an independent sub-circuit lower than that of the main hydraulic system, utilizing precise electronic commands rather than manual dials.

At the core of the ZDRE series is a robust proportional solenoid mechanism. When the solenoid receives an electrical current, it acts directly against the internal control spool, shifting its position to meter fluid into the secondary circuit. If the downstream pressure attempts to rise beyond the electronic setpoint—whether due to external forces or actuator back-feed—the spool automatically shifts further, venting the excess fluid safely to the tank line (Port T) to maintain an unyielding, flat pressure profile.

Core Technical Features & Advantages

• Linear and Repeatable Adjustments: Optimized solenoid coils yield a minimal hysteresis loop, ensuring highly reliable, repetitive pressure profiling across automated production cycles.

• Space-Saving Vertical Stacking: The sandwich (rectilinear) body format eliminates the need for separate inline plumbing blocks, drastically shrinking the overall envelope of multi-station hydraulic manifolds.

• Rapid Dynamic Shifting: Because it operates as a direct-acting valve, the response time to electrical input variations or sudden downstream shocks is immediate, shielding delicate components from structural transients.

• Wet-Armature Solenoid Longevity: The solenoid core is completely enclosed within an oil-filled, pressure-sealed tube. This eliminates external dynamic seals that tear over time, dampens mechanical vibration, and enhances coil heat dissipation.

• Flexible Mounting Configurations: Fully matches global standard ISO 4401 layout standards, allowing it to layer seamlessly underneath standard directional valves from various international manufacturers.

Primary Applications

The Rexroth ZDRE sandwich proportional valve series is a critical automated control building block utilized globally across specialized high-stakes processing equipment:

• Precision workpiece clamping and variable holding force circuits in CNC machine tools

• Dynamic injection and mold-clamping control blocks in plastic injection molding machinery

• Balanced tensioning, braking, and uncoiling systems in metal forming or paper-winding lines

• Secondary circuit pressure scaling in multi-actuator industrial Hydraulic Power Units (HPUs)

• Automated test benches and calibration systems requiring remote, PLC-driven load profiling

Technical Specifications Table