DRE 20-5X/315YMG24K4M Rexroth Proportional Valve 315 Bar

Product Overview

The Bosch Rexroth DRE 20-5X/315YMG24K4M is a pilot-operated proportional pressure reducing valve designed for high-pressure industrial hydraulic systems requiring adjustable downstream pressure control.

This model belongs to the DRE family rather than a conventional directional control valve. The Rexroth RE 29276 documentation defines the DRE(M) family as pilot-operated proportional pressure reducing valves. The valve uses a proportional solenoid to control a pilot stage, which then regulates the main spool for higher-flow pressure reduction.

The complete model code is associated with Rexroth material number R900916199 in product catalog records.

For this configuration:

• DRE = proportional pressure reducing valve with external control electronics
• 20 = Size 25 / NG25
• 5X = component series 5X
• 315 = 315 bar pressure rating
• Y = external pilot-oil return to tank
• M after Y = without A-to-B check valve
• G24 = 24 V DC version
• K4 = DIN EN 175301-803 electrical connection
• M at the end = NBR seal configuration

This configuration is especially suitable for OEM replacement projects where installation dimensions, pressure rating, electrical control and external pilot-drain requirements must be carefully matched.

Technical Specifications

• Model: DRE 20-5X/315YMG24K4M
• Brand: Bosch Rexroth
• Material Number: R900916199
• Valve Type: Pilot-operated proportional pressure reducing valve
• Nominal Size: Size 25 / NG25
• Pressure Rating: 315 bar
• Maximum Operating Pressure at A/B: 315 bar
• Maximum Setting Pressure at A: 315 bar
• Minimum Setting Pressure at Zero Command: 2 bar
• Maximum Main Valve Flow: up to 300 L/min for Size 25 in the RE 29276 family data
• Pilot Flow: approximately 0.8 L/min
• Control Method: proportional solenoid with external control electronics
• Supply Voltage: 24 V DC
• Standard Solenoid Design: G24 / 1600 mA
• Electrical Connection: K4, DIN EN 175301-803
• Seal Material: NBR
• A-B Check Valve: not included in this configuration
• Pilot Drain: external Y port, separately routed and discharged to tank without pressure
• Mounting: subplate mounting
• Mounting Standard: ISO 5781
• Installation Position: any
• Weight Reference for Size 25 DRE/DREM: approximately 6.0 kg in the RE 29276 successor-series documentation
• Hydraulic Fluid: mineral-oil based fluids according to DIN 51524; selected fire-resistant fluids according to ISO 12922 may also be used within specified limitations
• Fluid Temperature: -20 to +80 °C
• Viscosity Range: 15 to 380 mm²/s
• Recommended Cleanliness: ISO 4406 Class 20/18/15
• Hysteresis: approximately ±3.5% of maximum setting pressure
• Repeatability: < ±2% of maximum setting pressure
• Linearity: ±2% of maximum setting pressure
• Displacement: Not applicable
• Maximum Speed: Not applicable because the valve has no rotating drive element
• Peak Pressure: No separate peak-pressure value is specified for this DRE configuration; 315 bar is the relevant maximum operating/pressure-rating value.

Key Technical Advantages

1. Two-stage pressure regulation

The pilot-operated architecture separates the proportional control function from the main hydraulic flow control.

The proportional solenoid regulates the pilot stage, while the main spool handles the larger hydraulic flow. This makes the design suitable for higher-flow pressure reduction applications and supports stable downstream pressure regulation.

2. 315 bar industrial pressure capability

The 315 bar pressure rating makes the DRE 20 suitable for demanding industrial hydraulic circuits where conventional low-pressure proportional valves are not sufficient.

The pressure range can be continuously adjusted through the proportional control signal, allowing different operating modes to use different downstream pressure settings.

3. Linearized command-value pressure characteristic

Rexroth specifies a linearized command value-pressure characteristic curve for the DRE family.

From an automation engineering perspective, this simplifies the relationship between the control signal and target pressure, making the valve easier to integrate into PLC, analog control and hydraulic motion-control systems.

4. Controlled external pilot drain

The Y configuration uses a dedicated external pilot drain.

This architecture helps isolate the pilot control circuit from uncontrolled return-line back pressure. Correct Y-line installation is therefore essential for achieving reliable pressure calibration and dynamic response.

5. Fine main-spool pressure control

The internal control architecture uses a main spool and fine control passages to manage pressure transitions.

According to the Rexroth functional description, the fine-control stage supports good transient behavior and reduces pressure undershoot during pressure reduction.

6. 24 V DC industrial control

The G24 configuration uses a 24 V DC proportional control arrangement, making it compatible with common industrial hydraulic control architectures using external analog or digital amplifiers.

Rexroth documentation lists compatible external control solutions including VT-MSPA, VT-VSPA, VT-VSPD and VT-SSPA families.

7. Suitable for OEM replacement engineering

With standardized subplate mounting and defined hydraulic/electrical interfaces, the DRE 20-5X configuration can be considered for replacement projects where the original hydraulic circuit must be retained.

For replacement manufacturing, critical engineering checks should include:

• mounting and porting pattern
• pressure rating
• A/B/Y port functions
• 24 V DC control
• solenoid current compatibility
• K4 electrical interface
• NBR sealing compatibility
• external pilot-drain routing

For our replacement products, 100% simulated operating-condition testing can be applied to verify pressure regulation, dynamic response and long-duration stability before shipment.

Application Areas

Typical applications include:

• Injection molding hydraulic systems
• Die-casting equipment
• Hydraulic presses
• Forging and metal forming machinery
• Steel and metallurgical production lines
• Industrial clamping systems
• Plastic and rubber processing machinery
• Metalworking machinery
• High-pressure hydraulic power units
• Hydraulic test benches
• Automated pressure-control circuits
• OEM hydraulic control assemblies

Final selection should always be based on actual system flow, pressure profile, control signal, amplifier characteristics, hydraulic-fluid condition and A/B/Y piping configuration.

Expert Maintenance Tips

1. Keep the Y drain line separately routed

The Y port is not an ordinary return connection. It should be connected separately to a low-pressure tank return.

Incorrect Y-line routing can introduce back pressure into the pilot stage and cause pressure-setting errors or unstable dynamic behavior.

2. Do not confuse DRE with DREM

The DREM variant incorporates an optional maximum-pressure limitation. Your exact model is DRE 20-5X/315YMG24K4M, so the 350 bar protective pressure-limitation value from DREM configurations must not be advertised as the normal pressure rating of this DRE model.

3. Match the amplifier to the correct coil version

The model does not contain the “-8” designation, so it should not automatically be treated as the 800 mA version.

The RE 29276 documentation distinguishes the standard G24 1600 mA design from the G24-8 800 mA design.

4. Control hydraulic contamination

The published cleanliness recommendation is ISO 4406 Class 20/18/15.

Contamination can affect pilot orifices, spool control edges and pressure-regulating surfaces, leading to pressure drift, increased hysteresis or slower response.

5. Perform dynamic commissioning

Do not validate a replacement valve only with a single static pressure test.

A better commissioning sequence is:

• zero-command pressure verification
• staged pressure testing at 25%, 50%, 75% and 100% command
• dynamic load testing
• thermal stabilization
• continuous pressure-holding test

For replacement hydraulic valves, a 100% simulated operating-condition test provides stronger validation of real-world performance than a simple no-load bench inspection.