4WRZE25W6-220-7X Rexroth Proportional Valve 220 L/min 350 Bar
| Model Number | 4WRZE25W6-220-7X/6EG24NJETK31 |
|---|
Product Description
Product Overview
The 4WRZE25W6-220-7X/6EG24NJETK31 series pilot-operated proportional directional valve is manufactured to original Bosch Rexroth technical standards. Belonging to the 4WRZE series with size 25 (NG25 / ISO 4401-08), this valve is a high-performance 2-stage electro-hydraulic proportional directional control valve. Featuring a pilot-operated two-stage design conforming to ISO 4401-08-07-0-05 mounting standards, it is equipped with integrated on-board electronics (OBE). The proportional solenoid drives the pilot spool, and the pilot pressure then positions the main spool for continuous, precise proportional control of both direction and flow magnitude.
This model employs spool type W6 with a nominal flow rate of 220 L/min (at Δp = 10 bar, 5 bar per control land) and maximum operating pressure of 350 bar (ports P/A/B) and 210 bar on port T (250 bar with Y-port). The integrated electronics (OBE) are housed within the valve body, with a supply voltage of 24 VDC (6EG24N), command signal support for ±10 V voltage input (interface A1) or 4-20 mA current input (interface F1), and NBR seal material.
This product is dimensionally and functionally identical to the original Rexroth 4WRZE25W6 series valve, offering true drop-in interchangeability for direct replacement of same-specification OEM valves. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, spool position accuracy, flow linearity, and dynamic response characterization.
Technical Specifications
General Specifications
Model: 4WRZE25W6-220-7X/6EG24NJETK31
Product Series: 4WRZE (Size 25 / NG25 / ISO 4401-08 / CETOP 08)
Component Series: 7X (70 to 79 series)
Spool Symbol: W6
Design: Pilot-operated, 2-stage proportional directional valve with integrated on-board electronics (OBE), without electrical position feedback
Mounting Pattern: ISO 4401-08-07-0-05 (NG25)
Installation Position: Any
Hydraulic Parameters
Nominal Flow Rate: 220 L/min (at Δp = 10 bar, 5 bar per control land)
Maximum Main Stage Flow: 870 L/min
Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)
Maximum Tank Port Pressure (Port T): 210 bar (3045 psi)
Tank Port Pressure (with Y-port): 250 bar (3625 psi)
Hydraulic Fluid: Mineral-based hydraulic oil (HL, HLP, HLPD, HVLP, HVLPD) and HETG, HEES, HEPG, HFDU, HFDR
Fluid Temperature Range: -20°C to +80°C (NBR seals)
Filtration: ISO 4406 19/17/14
Seal Material: NBR
Pilot Control Parameters
Pilot Oil Supply: Internal
Pilot Oil Drain: External
Main Stage Return: Spring centered
Electrical Parameters
Supply Voltage: 24 VDC
Command Signal: ±10 V voltage input (interface A1) / 4-20 mA current input (interface F1)
Electrical Connector: Per DIN EN 175201-804 (4-pole, without mating connector)
Integrated Electronics: OBE (On-Board Electronics)
Continuous Current: 1.8 A
Coil Insulation Class: Class H (150°C)
Protection Class: IP65
Manual Override: Concealed (N9)
Materials & Construction
Valve Body: High-strength cast iron
Control Spool: Carburized steel, precision ground
Seals: NBR (standard) / FKM (optional)
Surface Treatment: Phosphating / anti-corrosion coating
Weight
Weight: approx. 18.4 kg
Key Technical Advantages
1. Pilot-Operated Two-Stage Control with High Flow Capacity
The 4WRZE25W6-220-7X employs a pilot-operated two-stage control structure where the pilot stage is actuated by proportional solenoids and the main spool is positioned by pilot pressure, achieving flow capacity up to 870 L/min. The main stage features spring-centered design; with de-energized solenoids, the spool automatically returns to the central position, ensuring a safe system state. Connection from P to A and B to T is via metering cross-sections with progressive flow characteristics, achieving high-accuracy control of flow direction and magnitude.
2. Integrated OBE Electronics for Simplified System Architecture
The valve integrates the proportional amplifier directly into the valve body (On-Board Electronics), eliminating the need for an external amplifier. Users can directly drive the spool via a ±10 V voltage signal or 4-20 mA current signal. The integrated design reduces external wiring and cabinet space requirements while minimizing electromagnetic interference on signal transmission. The valve body supports analog connectivity with selectable 0-10 V or 4-20 mA command signal interfaces for easy system integration and commissioning.
3. Precision Spool Machining with Progressive Flow Control
The control spool is precision-ground from carburized steel. Metering notches are precision-machined on the spool lands, delivering progressive linear flow characteristics during spool shifting. Combined with precision-machined spool and bore, the clearance is controlled at micron level, maintaining low internal leakage and responsive shifting performance at 350 bar operating pressure. The nominal flow of 220 L/min meets the precise flow control demands of medium-to-high flow hydraulic systems.
4. High Reliability Design for Demanding Environments
The valve offers excellent contamination tolerance, providing resistance to particulate contamination for reliable operation in industrial field environments. The valve body is made of high-strength cast iron with NBR seal material, offering good corrosion resistance and operating across a temperature range of -30°C to +80°C. A concealed manual override (N9) is provided for commissioning and maintenance under power-off conditions. Caution is advised as accidental activation may lead to uncontrolled machine movements.
5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every 4WRZE25W6-220-7X/6EG24NJETK31 valve undergoes 100% bench testing prior to shipment, covering 350 bar rated pressure holding, spool position accuracy calibration, flow-signal linearity verification, internal leakage measurement, and solenoid dynamic response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original Rexroth valve, enabling direct drop-in replacement without modifying piping or control programs.
Application Areas
Injection Molding Machines: Proportional control of injection speed and holding pressure, precise control of mold closing and injection actions
Hydraulic Presses: Proportional speed and direction regulation for medium-to-high flow hydraulic systems
Die Casting Machines: Shot speed and intensification pressure precise regulation
Metallurgical Equipment: Precision control for continuous casting machines and rolling mill auxiliary hydraulic systems
Construction Machinery: Excavator and crane hydraulic drive system direction and flow control
Marine & Offshore: Offshore platform hydraulic control systems
Wind Power Generation: Pitch control system hydraulic directional control
Testing Equipment: Hydraulic loading direction control for large material testing machines
Expert Maintenance Tips
Installation Guidelines
The 4WRZE25W6-220-7X series can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-08-07-0-05 for direct installation on standard subplates or manifolds.
Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes. Recommended fluid cleanliness is ISO 4406 19/17/14 or better.
Pilot Drain Line Management: This valve uses external pilot drain. The pilot drain line must return independently to the reservoir with back pressure not exceeding 210 bar (250 bar with Y-port). The pilot drain line must not share a common return with other high-pressure circuits.
Electrical connections must use a 4-pole connector conforming to DIN EN 175201-804 to maintain IP65 protection. Control signal cables should be shielded, with the shield grounded at one end.
Routine Maintenance Procedures
Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 19/17/14 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.
Electrical Zero Point Verification: Periodically check the electrical zero point for drift with the power supply disconnected. If zero point deviation exceeds ± 2%, re-calibrate using dedicated tools via the OBE electronics.
Coil Resistance Verification: Measure solenoid coil resistance every 1,000 operating hours. Deviation from factory value should not exceed ± 10%. Continuous current is 1.8 A with Class H (150°C) coil insulation; monitor for abnormal temperature rise.
Internal Leakage Monitoring: Due to the design principle, pilot-operated proportional valves have inherent internal leakage which may increase over the life cycle. An annual internal leakage test is recommended. If leakage exceeds 150% of the factory standard, seal replacement should be scheduled.
Manual Override Precautions: Periodically check that the concealed manual override (N9) is in the non-activated state to prevent accidental activation leading to uncontrolled machine movements. If manual operation is required, proceed cautiously after system depressurization.
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Company Profile


Frequently Asked Questions
1.What ls our Main Products?
1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts
2. What about the MOQ?
3.What are your advantages?
- Adhere to quality first.
- Support customization, ODM & OEM service.
- 1-year warranty and complete after-sales support.
- Safe and fast shipping worldwide.
- 24-hour online service for your inquiries.
4.Are you a manufacturer? What’s your delivery time?
5.Which payment methods are accepted?
6.How will you deliver my goods?
7.How do you inspect and guarantee your products?
8.What about after-sales service?
9.What are your main applications?
- Hydraulic systems
- Agricultural machinery
- Construction machinery
- Automobile industry
- Local distributors and maintenance centers
10.Can I get a discount for bulk orders?
Professional Manufacturer












