Rexroth DR Series Pressure Reducing Valve | DR10 DR20 DR30 | R900413987
| Model Number | DR20-4-43/315Y, R900413987 DR10-5-43/50Y |
|---|
Product Description
The Rexroth DR Series from LIC Hydraulic is a pilot-operated pressure reducing valve designed to maintain a constant output pressure in a hydraulic sub-circuit, regardless of input pressure fluctuations. Covering nominal sizes DR10, DR16, DR20, DR25, DR30, and DR32, these valves are industry standards for precision pressure control. Models like DR10-5-43/50Y (R900413987) and DR20-4-43/315Y feature high-response pilot stages for superior stability. We guarantee 100% mechanical interchangeability and perform 100% pressure-linearity and leakage testing, ensuring reliable operation at system pressures up to $315\text{ bar}$.
Technical Configuration Details
Series: Rexroth DR (Pilot Operated)
Nominal Sizes: NG10, NG16, NG20, NG25, NG30, NG32
Max Pressure Rating: Up to $315\text{ bar}$ ($4500\text{ psi}$)
Mounting Interface: ISO 5781 compliant
Adjustment Type: Rotary knob or screw with hex nut (Shielded)
External Drain (Y): Ensures the pilot stage remains independent of return line pressure.
Key Technical Advantages
High Precision Pressure Stability: The pilot-operated design allows the valve to react rapidly to downstream demand, maintaining a flat pressure-flow curve with minimal hysteresis compared to direct-acting alternatives.
Wide Adjustment Range: Available in multiple pressure stages ($50, 100, 200, 315\text{ bar}$), allowing users to fine-tune the pressure for delicate operations such as clamping or braking.
Robust Subplate Mounting: Fully compatible with Rexroth and other standardized manifold blocks, simplifying the upgrade or replacement process in complex industrial HPU systems.
Optional Check Valve: Models can be configured with an integrated check valve (DR…Z) to allow free return flow from the secondary side to the primary side.
Application Areas
Machine Tool Clamping: Reducing main system pressure to a safe, constant level for workpiece fixtures.
Pilot Oil Supply: Providing a stabilized control pressure for proportional and logic valves.
Braking Circuits: Ensuring repeatable and precise braking force in mobile and industrial equipment.
Secondary Component Protection: Safeguarding downstream actuators that cannot withstand full system pressure.
Expert Maintenance Tips
Clear Drain Line (Port Y): It is critical that the external drain line is routed directly to the tank without any back-pressure. Back-pressure on Port Y will increase the reduced pressure setting, potentially leading to system errors.
Setting Security: Once the desired output pressure is achieved, always tighten the locknut. Vibration in industrial environments can cause the adjustment screw to drift over time.
Strict Filtration Standards: The pilot orifice is highly sensitive to particulates. Maintain oil cleanliness at ISO 4406 19/17/14 or better to prevent the pilot spool from sticking or the orifice from clogging.
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