4WRP10EA32S-1X Rexroth Proportional Valve NG10 315 bar

Product Overview

The 4WRP10EA32S-1X/G24Z4/M (Material No. 0811403002) is a direct-operated proportional directional valve from Bosch Rexroth’s 4WRP10 series, featuring electrical position feedback (LVDT) and belonging to the high-performance proportional valve product line. Built on the 1X component series, it mounts via subplate according to ISO 4401-05-06-0-94 (NG10 / Cetop 5) and provides continuous, proportional control of flow and direction for hydraulic actuators through proportional solenoid actuation.

The core technical characteristics are defined by three factors: the direct-operated architecture requires no external pilot oil, with the spool driven directly by the proportional solenoid for rapid response; the LVDT (Linear Variable Differential Transformer) displacement sensor provides full closed-loop spool position feedback control for high precision and repeatability; and the 32 L/min rated flow combined with 315 bar maximum operating pressure covers precision control requirements of medium-flow hydraulic systems.

The valve features external trigger electronics (order separately), with a 24 V DC wet-pin solenoid design featuring a detachable coil and IP65 protection rating. The spool is E-type with positive overlap and progressive flow characteristic, providing reliable sealing at center position. Model code breakdown: 4WRP = 4/3 direct-operated proportional directional valve; 10 = size NG10; EA = E-type positive overlap spool with LVDT feedback; 32 = rated flow 32 L/min; S = progressive flow characteristic; 1X = component series; G24 = 24 V DC supply; Z4 = electrical interface configuration; M = NBR seals for mineral oil (HL, HLP).

As a drop-in replacement, the valve is fully compatible with the OEM Rexroth specification in mounting interface, electrical connection, and performance characteristics. Every unit undergoes 100% simulation-based testing prior to shipment, covering null stability, flow linearity, response time, and internal leakage.

Technical Specifications

All parameters below are based on Bosch Rexroth official technical documentation (RA 29022/01.05, RE 29395) and verified supplier technical pages:

• Complete Model: 4WRP10EA32S-1X/G24Z4/M

• Material Number (MNR): 0811403002

• Brand: Bosch Rexroth

• Product Series: 4WRP10 series, component series 1X

• Product Type: Direct-operated proportional directional valve with electrical position feedback (LVDT), external trigger electronics

• Spool Function: 4/3-way proportional directional valve

• Spool Variant: E-type positive overlap, progressive flow characteristic (S)

• Nominal Size: NG10 (ISO 4401-05-06-0-94 / Cetop 5)

• Mounting: Subplate mounting

• Max Operating Pressure (Ports P/A/B): 315 bar (4568 PSI)

• Max Operating Pressure (Port T): 250 bar

• Max Operating Pressure (Port L): 2 bar

• Rated Flow: 32 L/min (at Δp = 10 bar valve pressure differential, i.e. 5 bar per metering notch)

• Supply Voltage: DC 24 V (G24)

• Coil Resistance (20°C): 2.5 Ω

• Max Solenoid Current: 3.7 A

• Max Power Consumption: 60 VA

• Response Time (100% Step, Max): 50 ms

• Response Time (110% Step): 20 ms

• Hysteresis (Max): 0.75%

• Range of Inversion (Max): 0.5%

• Internal Leakage (per Metering Edge, Δp = 100 bar): ≤ 80 cm³/min

• Electrical Connector: DIN 43560-AM2

• Protection Class: IP65

• Hydraulic Fluid: Mineral oil (HL, HLP) per DIN 51524

• Seal Material: NBR (Nitrile)

• Weight: 8.0 kg

Note: Specifications are based on Bosch Rexroth official technical documentation RA 29022/01.05, RE 29395, and verified supplier technical pages (hydraulicpartsusa.com). This valve requires external trigger electronics (order separately), as detailed in Rexroth catalog sections RE 30048 and RE 30047. Always verify against the complete model code and consult the latest Rexroth official technical documentation during selection.

Key Technical Advantages

1. Direct-Operated Architecture with LVDT Full Closed-Loop Position Feedback for High-Precision Flow Control

The 4WRP10EA32S-1X employs a direct-operated design in which the spool is driven directly by a proportional solenoid, eliminating the need for external pilot oil supply. Compared with pilot-operated proportional valves, this architecture removes the additional leakage and pressure losses associated with pilot oil circuits, delivers faster response, and significantly reduces sensitivity to fluid contamination. The LVDT displacement sensor continuously measures actual spool position and feeds the signal back to the external trigger electronics, providing full closed-loop control of spool position. Hysteresis does not exceed 0.75% and range of inversion does not exceed 0.5%, achieving repeatability at industrial servo-grade levels.

2. Fast Dynamic Response for Precision Control Requirements

The valve achieves a response time of no more than 50 ms to a 100% step command and only 20 ms to a 110% step command, satisfying high-frequency dynamic loading, rapid directional switching, and precision velocity control requirements. The direct-operated architecture eliminates pilot-stage response lag, enabling the valve to rapidly track command signal changes. This characteristic is particularly critical for material testing machines, precision press-fitting equipment, and other applications with demanding dynamic response requirements.

3. Progressive Flow Characteristic with E-Type Positive Overlap Spool

The valve features a progressive flow characteristic, enabling fine flow resolution at low command levels before opening wider for maximum delivery, improving positional stability in servo circuits. The E-type positive overlap spool design provides reliable sealing at center position, suitable for applications requiring precise stopping and pressure holding.

4. High Pressure Rating with Low Internal Leakage Design

Maximum operating pressure at ports P/A/B is 315 bar, allowing direct integration into high-pressure hydraulic circuits for medium-duty industrial applications. Internal leakage is limited to 80 cm³/min per metering edge (at Δp = 100 bar), effectively conserving energy and maintaining control accuracy. Port L maximum pressure is limited to 2 bar, ensuring safe operation of the low-pressure drain circuit.

5. Wet-Pin Solenoid with IP65 Protection for Demanding Industrial Environments

The valve employs a 24 V DC wet-pin solenoid with detachable coil and IP65 protection rating, preventing dust ingress and water jet exposure from reaching internal components. NBR seal material provides excellent resistance to mineral oil-based hydraulic media. The solenoid cable connects via DIN 43560-AM2 standard connector for easy field wiring and maintenance.

Application Areas

• Injection Molding Machines: Closed-loop control of injection velocity and hold pressure for consistent part quality

• Die Casting Equipment: High-speed dynamic pressure regulation and real-time switching control

• Hydraulic Presses: Precision position/velocity control, force/position hybrid control

• Material Testing Systems: Flow and pressure closed-loop control for electro-hydraulic servo loading systems

• Vibration Tables & Test Rigs: Precision flow control under high-frequency dynamic response conditions

• Precision Press-Fitting Equipment: Servo-grade closed-loop force/position control

• Machine Tool Hydraulic Systems: Flow and direction control for precision hydraulic feed axes

• General Industrial Hydraulic Systems: Precision directional and flow control for automated production lines

Expert Maintenance Tips

Pre-Installation Checks:

• Verify the manifold mounting surface conforms to ISO 4401-05-06-0-94 standard; surface roughness Rzmax ≤ 4 μm, flatness deviation ≤ 0.01 mm/100 mm

• Flush all piping with clean hydraulic fluid prior to installation; ensure system cleanliness meets proportional valve requirements

• Inspect NBR O-rings for damage and confirm compatibility with the hydraulic fluid in use

• Confirm external trigger electronics (order separately) are correctly configured and wired

• Tighten mounting bolts in diagonal sequence to specified torque

Operational Maintenance:

• Use a 5–10 μm precision pressure filter, specified without bypass and equipped with a contamination indicator

• Recommended fluid: HL, HLP mineral oil per DIN 51524

• Periodically inspect external trigger electronics status indicators; confirm 24 V DC supply remains stable within allowable range

• Monitor null output flow offset; significant increase indicates spool/sleeve wear or LVDT sensor anomaly

• Periodically verify solenoid coil resistance remains stable at 2.5 Ω (20°C); confirm DIN 43560-AM2 connector contact integrity

• Port L drain pressure must not exceed 2 bar; ensure low-pressure drain circuit is unobstructed

Troubleshooting Guide:

• Spool fails to actuate or responds abnormally: Check 24 V DC supply, verify control signal reaches external trigger electronics correctly, check solenoid connector contact integrity

• Null-point drift: After ruling out fluid contamination, verify LVDT sensor feedback signal integrity; check whether the spool is stuck at a non-center position due to contamination

• Insufficient flow: Confirm system supply pressure is within the 315 bar allowable range; check spool metering edges for partial blockage by contaminant particles

• Slow response: Check system cleanliness level; verify external trigger electronics parameter settings are properly matched

• Abnormal noise: Check that system return pressure does not exceed the 250 bar maximum; confirm no back-pressure blockage in the return line