Product Overview
The DREM 20-5X/50YMG24K4M is a pilot-operated proportional pressure reducing valve from Bosch Rexroth’s DREM series. The DREM series adds proportional solenoid control to a standard pilot-operated pressure reducing valve, allowing downstream pressure to be set electronically via an analog command signal (0–10V or 4–20mA) rather than a fixed mechanical spring setting. This enables dynamic pressure profiling and remote adjustment in closed-loop hydraulic systems—for example, varying clamping force between different workpieces, adjusting injection pressure profiles in plastics machinery, or controlling pilot pressure in complex hydraulic control circuits.
The DREM 20-5X/50YMG24K4M is rated at NG20 with subplate mounting. The valve integrates an OBE (On-Board Electronics) amplifier and spool position feedback for precise, repeatable pressure control with low hysteresis. As a pilot-operated proportional reducing valve, it regulates the pilot stage pressure via a proportional solenoid, enabling the main stage outlet pressure to vary proportionally to the command signal.
As a direct OEM-replacement solution, this valve maintains 100% mechanical and functional interchangeability with the original Rexroth unit. Every valve undergoes rigorous simulation testing—including pressure cycling, thermal variation, and full-stroke endurance validation—to guarantee factory-grade performance. Ideal for industrial hydraulic systems requiring dynamic pressure regulation and remote control.
Technical Specifications
Model: DREM 20-5X/50YMG24K4M
Brand: Bosch Rexroth
Valve Type: Pilot-operated proportional pressure reducing valve
Nominal Size: NG20
Mounting Type: Subplate mounting
Max. Operating Pressure: 315 bar (31.5 MPa)
Max. Flow: 300 L/min
Pressure Adjustment Range: 50 bar (“50Y” code indicates max 50 bar set pressure)
Component Series: 5X (50–59 series, installation and connection dimensions unchanged)
Control Type: Proportional solenoid with integrated OBE and spool position feedback
Command Signal: 0–10V or 4–20mA
Supply Voltage: 24V DC
Hysteresis: < 1.5% of rated pressure
Seal Material: NBR (M code)
Body Material: Cast steel
Compatible Fluids: Mineral oil (HL, HLP) per DIN 51524
Operating Temperature Range: -20°C to +70°C (reference)
Weight: Approx. 6 kg
Mounting Interface: ISO 5781
Solenoid Feature: Rotatable and detachable coil
Key Technical Advantages
1. Pilot-Operated Proportional Control – Dynamic Pressure Profiling
The DREM series integrates proportional solenoid control into a standard pilot-operated reducing valve, enabling electronic pressure setting via analog command signals. This design allows real-time pressure setpoint variation during machine cycles, enabling dynamic pressure profiling for applications such as clamping force adjustment and injection pressure curve control.
2. Integrated OBE with Spool Position Feedback – High Precision and Low Hysteresis
The valve integrates an OBE amplifier and spool position feedback for closed-loop pressure control. The position feedback continuously monitors actual main spool position against the command signal, ensuring precise proportional relationship between outlet pressure and command input. Hysteresis < 1.5% ensures excellent repeatability and control quality.
3. No External Amplifier Required – Simplified System Integration
The integrated OBE electronics accept 0–10V or 4–20mA standard control signals directly, eliminating the need for external amplifiers. This integrated design significantly simplifies electrical wiring, reduces system costs, minimizes potential failure points, and reduces control cabinet space requirements.
4. Rotatable and Detachable Coil Design – Easy Maintenance
The proportional solenoid features a rotatable and detachable coil. Coils can be replaced or rotated without opening the pressure-tight hydraulic chamber, greatly simplifying on-site maintenance and minimizing downtime.
5. Drop-In Interchangeability – Minimized Downtime and Retrofit Costs
The valve strictly adheres to Bosch Rexroth’s original mounting dimensions and functional specifications, with ISO 5781 interface compliance. Whether for new system design or legacy system upgrades, this valve offers 100% mechanical and electrical interchangeability with the original Rexroth unit—eliminating the need for manifold modifications or piping changes, significantly reducing downtime and retrofit expenses.
Application Areas
Injection Molding Machinery – Programmable injection and hold pressure profile control
Clamping Circuits – Variable clamping force control for different workpiece materials
Press Control – Variable die-cushion pressure during forming cycles
Test Equipment – Precise, remotely adjustable pressure setpoints
Pilot Pressure Control – Adjustable pilot supply for proportional valve systems
Force Control Systems – Closed-loop force control via pressure regulation
Metallurgical Equipment – Precision pressure control in rolling mill hydraulic systems
Expert Maintenance Tips
1. Fluid Cleanliness Management
DREM series proportional reducing valves feature pilot-operated construction with extremely tight spool-to-sleeve clearances. Maintain system fluid cleanliness to ISO 4406 18/16/13 or better. Install filters with a minimum rating of 10μm upstream of the valve.
2. Electrical Connections and Signal Matching
The valve features integrated OBE electronics supporting 0–10V or 4–20mA command signals. Supply voltage is 24V DC. Verify that the command signal type and supply voltage match the system specifications prior to installation. Use shielded cables for signal transmission with reliable single-point grounding to effectively suppress electromagnetic interference.
3. Return Line Backpressure Control
Pilot-operated reducing valves are sensitive to return line backpressure. Ensure return line backpressure remains within allowable limits to prevent pressure setpoint drift or abnormal spool performance.
4. Installation and Sealing
Carefully review the Bosch Rexroth product documentation prior to installation. Ensure the mounting surface is flat and smooth, with ISO 5781 interface compliance. Tighten mounting bolts evenly to specified torque. Take care not to damage or omit seals during assembly. The solenoid coil is rotatable to accommodate different wiring orientations.
5. Commissioning and Parameter Configuration
During initial commissioning, test valve operation with low voltage/current signals first, then gradually increase to the required setpoint after confirming normal pressure response. Command signals can be adjusted in real time via PLC or controller for dynamic pressure profiling.
6. Periodic Inspection and Maintenance
Regularly verify the valve’s pressure-command signal characteristic curve. If increased hysteresis or reduced repeatability is detected, inspect the OBE electronics unit functionality and check for spool sticking. For systems that have been idle for extended periods, perform thorough system circulation filtration before restart.
