Name: China 4WRZE25 A1 Pilot‑Operated Proportional Directional Valve ±10V Voltage Control | NG25 Size | Integrated OBE Manufacturers - Bokin
Brand: Bokin
SKU: 296421452

Bokin Electro-Hydraulic Technology (Foshan) Co., Ltd. is one of the leading manufacturers and suppliers of 4WRZE25 A1 Pilot‑Operated Proportional Directional Valve
±10V Voltage Control | NG25 Size | Integrated OBE in China. If you're going to wholesale bulk durable 4WRZE25 A1 Pilot‑Operated Proportional Directional Valve
±10V Voltage Control | NG25 Size | Integrated OBE made in China, welcome to get pricelist from our factory. All customized products are with high quality and competitive price.

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Key Specifications At a Glance

Parameter	Value
Nominal Size	NG25 (Component Series 7X)
Mounting Standard	ISO 4401‑08‑08‑0‑05
Max Operating Pressure (A/B/P ports, main valve)	350 bar
Max Operating Pressure (T port, external pilot return)	250 bar
Max Operating Pressure (internal pilot supply)	100 bar
Max Flow	870 L/min
Rated Flow (Δp = 5 bar per control edge)	220 / 325 L/min
Control Signal	A1 interface, ±10 VDC voltage input
Input Resistance	＞100 kΩ
Hysteresis	＜6%
Supply Voltage	24 VDC (19 – 36 VDC range)
Protection Class	IP65 (correctly mounted connector)
Ambient Temperature	-20°C to +50°C
Hydraulic Fluid Temperature	-20°C to +80°C
Weight	19.0 kg
Optional Features	Concealed manual override (N9), pressure reducing valve (D3), seawater‑resistant version (J)
Seal Material	NBR (M) / FKM (V)
CE Compliance	MD 2006/42/EC, EN ISO 12100:2010, EMC Directive 2014/30/EU, RoHS 2011/65/EU

Available Configurations

Select the flow rating and spool type for your system:

Model Number	Rated Flow	Spool Type	Quick Action
4WRZE 25 E220-7X/6EG24N9K31/A1M	220 L/min	Standard zero overlap (E)	Inquire Now
4WRZE 25 E220-7X/6EG24N9EK31/A1M	220 L/min	Standard zero overlap (E)	Inquire Now
4WRZE 25 E220-7X/6EG24N9TK31/A1M	220 L/min	Standard zero overlap (E)	Inquire Now
4WRZE 25 E220-7X/6EG24N9ETK31/A1M	220 L/min	Standard zero overlap (E)	Inquire Now
4WRZE 25 E350-7X/6EG24N9K31/A1M	350 L/min	Standard zero overlap (E)	Inquire Now
4WRZE 25 E350-7X/6EG24N9EK31/A1M	350 L/min	Standard zero overlap (E)	Inquire Now
4WRZE 25 E350-7X/6EG24N9TK31/A1M	350 L/min	Standard zero overlap (E)	Inquire Now
4WRZE 25 E350-7X/6EG24N9ETK31/A1M	350 L/min	Standard zero overlap (E)	Inquire Now

Need a custom spool profile or special configuration? Send us your requirements → Get Custom Solution

Product Key Advantages

1. Pilot‑Operated High‑Flow Precision Control

Pilot‑operated two‑stage structure with proportional solenoid actuation delivers accurate flow direction and size control for heavy‑duty high‑flow hydraulic systems. Integrated OBE with adjustable ramp generator (0–2.5 s rise/fall time) and interlocking function prevents conflicting solenoid commands, with ＜6% hysteresis.

2. Standardized Interchangeable Design

Manufactured strictly to ISO 4401‑08‑08‑0‑05 NG25 mounting dimensions with identical port layout and ±10V A1 electrical pin‑out matching Rexroth 4WRZE25 A1. Direct drop‑in installation without manifold re‑machining or rewiring, minimizing retrofit downtime.

3. Heavy‑Duty Robust Construction

19.0 kg reinforced valve housing withstands mechanical stress of continuous heavy‑duty operation. Throttle inserts in pilot control valve optimize flow dynamics and reduce pressure pulsation. Optional pressure reducing valve (D3) and multiple seal material options adapt to diverse system requirements.

4. Industrial‑Grade Reliability & Safety

IP65 ingress protection with properly mounted connectors withstands harsh industrial contaminants and high surface temperatures. Spring‑centered spool returns to neutral position upon de‑energization for safe system reset. Optional concealed manual override (N9) enables emergency operation without power.

Compatibility Reference

Corresponding Rexroth Model	BOKIN Equivalent Model	Core Match Points
4WRZE 25 E220-7X/6EG24N9K31/A1M	4WRZE 25 E220-7X/6EG24N9K31/A1M	Same ISO 4401 NG25 mounting, ±10V A1 interface, integrated OBE, hydraulic performance
4WRZE 25 E220-7X/6EG24N9EK31/A1M	4WRZE 25 E220-7X/6EG24N9EK31/A1M
4WRZE 25 E220-7X/6EG24N9TK31/A1M	4WRZE 25 E220-7X/6EG24N9TK31/A1M
4WRZE 25 E220-7X/6EG24N9ETK31/A1M	4WRZE 25 E220-7X/6EG24N9ETK31/A1M
4WRZE 25 E350-7X/6EG24N9K31/A1M	4WRZE 25 E350-7X/6EG24N9K31/A1M
4WRZE 25 E350-7X/6EG24N9EK31/A1M	4WRZE 25 E350-7X/6EG24N9EK31/A1M
4WRZE 25 E350-7X/6EG24N9TK31/A1M	4WRZE 25 E350-7X/6EG24N9TK31/A1M
4WRZE 25 E350-7X/6EG24N9ETK31/A1M	4WRZE 25 E350-7X/6EG24N9ETK31/A1M
More models are available; please contact us for additional model options.

Note: For system configuration reference only. BOKIN is an independent brand. Please verify specifications before installation.

Typical Applications

Large hydraulic presses & heavy material handling equipment
Steel mill hydraulics & plastic extrusion machines
Mining equipment & heavy industrial machinery
High‑flow industrial hydraulic power units
Heavy‑duty automation systems & production lines

Need current‑loop anti‑interference control?

View 4WRZE25 F1 (4‑20mA) →

Need larger flow capacity?

View 4WRZE32 A1 (NG32) →

Installation & Commissioning Guidelines

Installation Notes

Thoroughly clean all oil ports and connecting surfaces before installation to prevent contaminants from entering the valve body.
Confirm the control signal type (±10V voltage) and power‑supply voltage match the valve nameplate specifications before wiring.
Tighten 6 mounting bolts evenly to the recommended torque (100–130 Nm for M12 screws) to avoid valve‑body deformation and internal leakage, complying with ISO 4401‑08‑08‑0‑05 NG25 mounting specifications.
Preferred horizontal installation. Ensure the tank line does not run empty; install a back‑pressure valve if required by installation conditions.
Use shielded LiYCY cable (7×0.75 mm² up to 20 m / 7×1.0 mm² up to 40 m) with metal mating connector and double‑ended shielding for EMC‑compliant installation.
Gradually ramp‑up system pressure during commissioning. Inspect for leakage and abnormal noise before switching to full‑load operation.

Safety Precautions

Retain manual hydraulic override for backup safety during system retrofits.
Fit pressure‑relief valves in the hydraulic circuit for overpressure protection.
Implement emergency‑stop logic to de‑energize the proportional valve under fault conditions.
Ensure hoses and hydraulic connections are rated for the system's maximum working pressure.
Accidental activation of the manual override may lead to uncontrolled machine movements; only operate by trained personnel.

FAQ

Q: What is the main difference between 4WRZE25 A1 and 4WRZ25 A1?

A: 4WRZE25 A1 has integrated on‑board electronics (OBE) built into the valve body. 4WRZ25 A1 requires a separate external amplifier for control. Both share the same NG25 mounting footprint and hydraulic performance.

Q: What pilot oil supply modes are available for 4WRZE25?

A: Four standard modes: external pilot & external return (standard), internal pilot & external return (E), internal pilot & internal return (ET), external pilot & internal return (T). Select based on your system circuit design.

Q: Can this valve directly replace Rexroth 4WRZE25 series?

A: Yes. It follows the same ISO 4401 NG25 mounting standard, identical port geometry, ±10V A1 electrical interface and hydraulic performance. It supports drop‑in installation on compatible manifolds. Please send your full part number for final compatibility confirmation.

Q: What about warranty and lead‑time?

A: All standard valves carry a 12‑month quality warranty from delivery date plus lifelong technical consultation. Standard 4WRZE25 A1 configurations ship within 2‑4 weeks after order confirmation.