Product Overview

The DREME 10-5X/315YG24K31M is a Bosch Rexroth pilot-operated proportional pressure reducing valve with integrated electronics (OBE).

The verified Rexroth material number is:

R900927827

and the corresponding ordering code is:

DREME 10-5X/315YG24K31M.

Rexroth defines the DREME as a pilot-operated proportional pressure reducing valve. The hydraulic architecture consists of a pilot control valve with proportional solenoid, a main valve and main spool insert. The DREME version additionally integrates electronic control in the solenoid housing. Rexroth also states that the command-value pressure characteristic is adjusted in the factory with low manufacturing tolerance.

The model code identifies:

• DREME: Integrated OBE electronics
• 10: Size 10
• 5X: Component Series 5X
• 315: 315 bar pressure rating
• Y: External, separate and depressurized pilot return to tank
• G24: 24 VDC supply
• K31: DIN EN 175201-804 electrical connection
• M: NBR seals at the final code position

Rexroth’s ordering-code structure also distinguishes the A/B check-valve configuration, so the complete ordering code must be matched during replacement.

Technical Specifications

DREME 10-5X/315YG24K31M

• Manufacturer: Bosch Rexroth
• Full Model: DREME 10-5X/315YG24K31M
• Material Number: R900927827
• Product Type: Pilot-operated proportional pressure reducing valve
• Nominal Size: Size 10
• Component Series: 5X
• Pressure Rating: 315 bar
• Maximum Operating Pressure: 315 bar
• Maximum Set Pressure at Port A: 315 bar
• Factory Maximum Pressure Limitation: approximately 350 bar for the 315 bar pressure-rating version
• Maximum Main-Valve Flow: 300 L/min
• Pilot Flow: approximately 1.0 L/min
• Pilot Return: External, separate and depressurized to tank
• Integrated Electronics: OBE
• Supply Voltage: 24 VDC
• Supply Voltage Range: 21–35 VDC
• Maximum Current Consumption: ≤1.5 A
• Recommended Fuse: 2 A, time-lag
• Electrical Connection: K31, DIN EN 175201-804
• Mounting: Subplate mounting
• Porting Standard: ISO 5781
• Installation Position: Any
• Ambient Temperature: -20°C to +50°C
• Storage Temperature: -20°C to +80°C
• Hydraulic Fluid Temperature: -20°C to +70°C
• Viscosity Range: 15–380 mm²/s
• Hydraulic Cleanliness: ISO 4406(c) Class 20/18/15
• Seal Material: NBR
• Hysteresis: ±3% of maximum setting pressure
• Repeatability: <±2% of maximum setting pressure
• Linearity: ±3.5% of maximum setting pressure
• DREME Command-Value Pressure Characteristic Manufacturing Tolerance: ±1.5% of maximum setting pressure
• Displacement: Not applicable
• Maximum Rotational Speed: Not applicable.

Electrical Control

The DREME integrated-electronics platform specifies:

• Nominal Supply: 24 VDC
• Lower Supply Limit: 21 VDC
• Upper Supply Limit: 35 VDC
• Maximum Current Consumption: ≤1.5 A
• Recommended Fuse: 2 A time-lag
• K31 Connector: DIN EN 175201-804
• A1 Command Interface: 0–10 V
• F1 Command Interface: 4–20 mA

The actual command interface should be confirmed from the complete ordering code. The supplied model contains K31M but does not contain an A1 or F1 suffix, so an A1/F1 input should not be assigned without further model documentation.

Key Technical Advantages

1. Pilot-Operated Proportional Pressure Regulation

The DREME uses a pilot stage to control the main spool and regulate pressure at port A.

The proportional solenoid establishes the pilot pressure, while the main spool balances hydraulic forces to maintain the required pressure level.

2. Integrated OBE Electronics

The DREME integrates the electronics directly into the proportional-solenoid assembly.

This creates a compact electro-hydraulic control unit and reduces dependence on a separate external proportional amplifier.

3. 315 Bar Pressure Rating

The /315 designation identifies the 315 bar pressure-rating version.

For this version, Rexroth specifies a factory maximum-pressure limitation of approximately 350 bar for protection against excessive pressure under abnormal electrical conditions.

The 350 bar figure should therefore not be presented as the normal continuous operating pressure.

4. Up to 300 L/min Main-Valve Flow

The DRE(M)E 5X platform is specified with a maximum main-valve flow of 300 L/min, while pilot flow is approximately 1.0 L/min.

Actual operating flow must still be evaluated against the manufacturer’s pressure-flow characteristics and operating differential pressure.

5. External Pilot Return

The Y configuration requires the pilot oil to return externally and separately to the tank at zero pressure.

This arrangement is important for maintaining stable pilot-stage pressure behavior.

6. Defined Proportional-Control Accuracy

The published DREME performance data include:

• Hysteresis: ±3%
• Repeatability: <±2%
• Linearity: ±3.5%
• Command-value pressure characteristic manufacturing tolerance: ±1.5%.

These parameters demonstrate the valve’s intended use in controlled electro-hydraulic pressure regulation rather than simple pressure switching.

7. Mechanical Maximum-Pressure Protection

Rexroth specifies an optional spring-loaded maximum pressure limitation to protect against excessive A-port pressure caused by abnormal proportional-solenoid current or contamination-related faults.

This adds a hydraulic protection layer alongside the electronic pressure-control function.

Application Areas

Typical applications include:

• Industrial hydraulic power units
• Hydraulic clamping systems
• Industrial pressure-control circuits
• Machine tools
• Hydraulic test equipment
• Forming and processing machinery
• Automated production systems
• Hydraulic cylinder pressure regulation
• Multi-pressure hydraulic systems
• Electro-hydraulic proportional control systems

The primary function is proportional pressure reduction and regulation, rather than directional switching.

Expert Maintenance Tips

1. Keep the Y Return Circuit Independent

The Y configuration requires an external, separate and depressurized pilot return.

Check return piping, filters, common return pressure and restrictions before troubleshooting pressure instability.

2. Separate Operating Pressure From Maximum Pressure Limitation

For this version:

Maximum operating pressure = 315 bar

while the factory maximum-pressure limitation may be set to approximately:

350 bar.

These values have different engineering meanings.

3. Verify the 24 VDC Supply

The OBE electronics operate from a nominal 24 VDC supply with a specified range of 21–35 VDC and maximum current consumption of ≤1.5 A.

Check the power supply and electrical connector before opening the hydraulic valve.

4. Maintain Hydraulic Cleanliness

Rexroth specifies ISO 4406(c) Class 20/18/15 cleanliness.

Contamination can affect pilot-stage operation and proportional pressure stability, so filtration should be checked before dismantling the valve.

5. Verify the A/B Check-Valve Configuration

The complete ordering code must be read carefully.

Rexroth distinguishes configurations with and without the A/B check valve, and the absence or presence of the M code after Y changes this configuration.

6. Inspect the Subplate and Sealing Surfaces

The valve uses subplate mounting according to the relevant ISO 5781 porting pattern.

Before installation, inspect the mounting surface, O-rings, hydraulic ports and fastening hardware.

7. Test the Complete Pressure-Control Loop

After replacement, verify:

24 VDC supply → command signal → pressure response → steady-state pressure → repeatability → dynamic response → leakage

For our replacement program, 100% simulated operating-condition testing can be used to verify pressure regulation, hydraulic leakage and electrical performance before shipment.