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BOKIN 4WRZ(E) Series Proportional Directional Valves

Pilot-Operated | With/Without Integrated OBE | ISO 4401 Mounting

 

4WRZ(E) series are pilot-operated two-stage proportional directional valves designed for precise flow direction and flow rate control in medium-to-large hydraulic systems. The 4WRZ version works with external control electronics for flexible system integration, while the 4WRZE version features integrated on-board electronics (OBE) for simplified wiring and commissioning. Both series share fully identical hydraulic mounting dimensions and flow performance, supporting straightforward drop-in replacement for equivalent Rexroth configurations.

 

Available in NG10, NG16, NG25 and NG32 nominal sizes, with ±10V voltage and 4-20mA current loop control options, and multiple spool profiles & pilot supply modes to suit injection molding, die casting, metal forming and hydraulic test bench applications.

 

Core Specifications：

NG10 – NG32 Sizes | 350 Bar Max Pressure | Up to 1600 L/min Flow | Hysteresis ≤ 6% | 12-Month Warranty

 

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Featured Product Models

 

 

Select the exact configuration for your system, and click to view full details for each model.

 

Model Control Type Nominal Size Max Flow Key Feature Quick Action
4WRZ(E)10 A1 ±10V Voltage NG10 170 L/min Z/ZE dual version, compact high response View Details
4WRZ(E)10 F1 4–20mA Current NG10 170 L/min Strong anti-interference, long-distance transmission View Details
4WRZ(E)16 A1 ±10V Voltage NG16 460 L/min Medium flow, flexible electrical configuration View Details
4WRZ(E)16 F1 4–20mA Current NG16 460 L/min High noise immunity, reliable for harsh industrial sites View Details
4WRZ(E)25 A1 ±10V Voltage NG25 870 L/min Medium-large flow, high control precision View Details
4WRZ(E)25 F1 4–20mA Current NG25 870 L/min Large flow, heavy-duty industrial use View Details
4WRZ(E)32 A1 ±10V Voltage NG32 1600 L/min Extra large flow, high capacity for heavy systems View Details
4WRZ(E)32 F1 4–20mA Current NG32 1600 L/min Anti-interference, stable for long-distance control View Details

 

Not sure which model fits? Send us your working pressure, flow rate and application, and our engineers will recommend the optimal configuration within 24 hours.

Get Free Model Recommendation

 

 

 

Core Advantages of 4WRZ(E) Series

 

 

1.Rexroth-Compatible Mounting & Interfaces

Manufactured strictly to ISO 4401 standard mounting dimensions, with identical port positions and electrical pin assignments to equivalent Rexroth 4WRZ / 4WRZE valves. Direct drop-in installation requires no manifold modification, rewiring or circuit redesign, greatly reducing retrofit downtime and project costs.

2. Dual Electrical Configurations, Universal Hydraulic Body

4WRZ (external amplifier) and 4WRZE (integrated OBE) share the same hydraulic body, mounting dimensions and flow performance. Customers can choose the electrical version according to their control system, with zero difference in hydraulic installation, greatly simplifying spare parts management and system upgrading.

3. Pilot-Operated Stable Large-Flow Control

Two-stage pilot structure delivers steady flow and pressure regulation even at high flow rates, with hysteresis controlled within 6%. The spring-centered main spool automatically returns to neutral position on power failure, protecting equipment and workpieces from damage, ensuring safe and reliable long-term operation.

4. Flexible Configuration for Diverse Scenarios

All sizes support both A1 voltage and F1 current control, with four pilot supply modes (standard internal, external pilot, external drain, external pilot + drain) and multiple spool profiles available to match unique circuit requirements. NBR and FKM sealing options are provided for different hydraulic fluids.

5. Reliable Quality & Fast Delivery

Every valve undergoes 100% full performance testing before shipment, backed by a 12-month global quality warranty. Standard models are available for fast delivery within 2–4 weeks, supporting both sample testing and bulk production orders.

 

 

Rexroth 4WRZ(E) Cross-Reference Guide

 

4WRZ (external control amplifier, K4 connector) and 4WRZE (integrated on-board electronics, K31 connector) share identical hydraulic mounting dimensions and flow performance, differing only in electrical configuration for direct interchangeability. Below are representative models covering both voltage and current control options for each nominal size.

 

Corresponding Rexroth Model BOKIN Equivalent Model Key Specifications
4WRZE 10 E85-7X/6EG24N9ETK31/A1M 4WRZE 10 E85-7X/6EG24N9ETK31/A1M NG10, 85 L/min, ±10V, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier
4WRZE 10 E85-7X/6EG24N9ETK31/F1M 4WRZE 10 E85-7X/6EG24N9ETK31/F1M NG10, 85 L/min, 4–20mA, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier
4WRZE 16 E180-7X/6EG24N9ETK31/A1M 4WRZE 16 E180-7X/6EG24N9ETK31/A1M NG16, 180 L/min, ±10V, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier
4WRZE 16 E180-7X/6EG24N9ETK31/F1M 4WRZE 16 E180-7X/6EG24N9ETK31/F1M NG16, 180 L/min, 4–20mA, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier
4WRZE 25 E325-7X/6EG24N9ETK31/A1M 4WRZE 25 E325-7X/6EG24N9ETK31/A1M NG25, 325 L/min, ±10V, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier
4WRZE 25 E325-7X/6EG24N9ETK31/F1M 4WRZE 25 E325-7X/6EG24N9ETK31/F1M NG25, 325 L/min, 4–20mA, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier
4WRZE 32 E520-7X/6EG24N9ETK31/A1M 4WRZE 32 E520-7X/6EG24N9ETK31/A1M NG32, 520 L/min, ±10V, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier
4WRZE 32 E520-7X/6EG24N9ETK31/F1M 4WRZE 32 E520-7X/6EG24N9ETK31/F1M NG32, 520 L/min, 4–20mA, external pilot & drain, NBR sealsHydraulically identical to 4WRZ version with K4 connector and external amplifier

 

Note: This cross-reference table is for configuration reference only. BOKIN valves are independently developed and manufactured products. Please confirm full model specifications with our team before installation to ensure compatibility.

 

 

 

Technical Specifications Overview

 

4WRZ and 4WRZE series share identical core hydraulic parameters. Differences lie only in electrical configuration and ambient temperature rating. All values comply with industry standard specifications for direct interchangeability with original Rexroth valves.

 

Specification 4WRZ(E) 10 (NG10) 4WRZ(E) 16 (NG16) 4WRZ(E) 25 (NG25) 4WRZ(E) 32 (NG32)
Max Operating Pressure (A/B/P ports) 350 bar 350 bar 350 bar 350 bar
Max Operating Pressure (T port, external pilot) 250 bar 250 bar 250 bar 150 bar
Max Flow 170 L/min 460 L/min 870 L/min 1600 L/min
Rated Flow (Δp = 5 bar) 25 – 85 L/min 125 – 180 L/min 220 – 325 L/min 360 – 520 L/min
Supply Voltage 24 VDC (19 – 36 VDC range) 24 VDC (19 – 36 VDC range) 24 VDC (19 – 36 VDC range) 24 VDC (19 – 36 VDC range)
Control Interface ±10 V (A1) / 4 – 20 mA (F1) ±10 V (A1) / 4 – 20 mA (F1) ±10 V (A1) / 4 – 20 mA (F1) ±10 V (A1) / 4 – 20 mA (F1)
Dynamic Response Time 80 – 240 ms 80 – 240 ms 80 – 240 ms 80 – 240 ms
Hysteresis ≤ 6% ≤ 6% ≤ 6% ≤ 6%
Response Sensitivity ≤ 0.5% ≤ 0.5% ≤ 0.5% ≤ 0.5%
Mounting Standard ISO 4401-05-05-0-05 ISO 4401-07-07-0-05 ISO 4401-08-08-0-05 ISO 4401-10-09-0-05
Protection Class IP65 (correctly mounted connector) IP65 IP65 IP65
Ambient Temperature 4WRZ: -20°C to +80°C4WRZE: -20°C to +50°C 4WRZ: -20°C to +80°C4WRZE: -20°C to +50°C 4WRZ: -20°C to +80°C4WRZE: -20°C to +50°C 4WRZ: -20°C to +80°C4WRZE: -20°C to +50°C
CE Compliance MD 2006/42/EC, EN ISO 12100:2010 MD 2006/42/EC, EN ISO 12100:2010 MD 2006/42/EC, EN ISO 12100:2010 MD 2006/42/EC, EN ISO 12100:2010

 

 

 

Typical Applications of 4WRZ(E) Valves

 
Plastic Injection Molding Machines
Plastic Injection Molding Machines
Die Casting Equipment
Die Casting Equipment
Metal Forming & Press Equipment
Metal Forming & Press Equipment
Hydraulic Test Rigs
Hydraulic Test Rigs
Metallurgical Heavy Machinery
Metallurgical Heavy Machinery
Material Handling Hydraulic Systems
Material Handling Hydraulic Systems
Marine Deck Machinery
Marine Deck Machinery

 

 

 

OEM & Customization Support

 

 

We provide flexible OEM and customization services for global distributors, system integrators and equipment manufacturers:

 

 

MOQ for custom branding is flexible. Contact our sales team for detailed OEM cooperation solutions.

 

Request OEM Solution

 

 

 

Quality & Certification

 

 

All BOKIN proportional valves are manufactured under strict process control and fully tested before shipment. Our products hold CE verification in compliance with relevant European directives and standards.

 

  • Certificate No.: ICR/VC/HM2601135
  • Standard: MD 2006/42/EC, EN ISO 12100:2010                         
  • Valid until: January 15, 2031
202608241904023344

 

 

 

FAQ

 

 

Q: Are BOKIN 4WRZ and 4WRZE hydraulically interchangeable?

A: Yes. They share identical ISO 4401 mounting dimensions, port sizes and hydraulic performance. The only difference is the electrical configuration: 4WRZ requires an external amplifier, while 4WRZE has built-in OBE electronics. They can be replaced with each other on the same manifold block.

Q: What is the difference between A1 (voltage) and F1 (current) control？

A: The A1 ±10V version offers simpler wiring and higher control precision, ideal for equipment with short wiring runs. The F1 4-20mA current version has stronger anti-interference performance and supports longer transmission distances, suitable for large workshops and harsh industrial sites.

Q: What pilot supply modes are available?

A: Four standard modes: standard internal pilot & drain, external pilot (E), external drain (T), and external pilot + external drain (ET), which can be selected according to system pressure and circuit design.

Q: What is the minimum order quantity and standard lead time?

A: MOQ is 1 piece for all standard models. Standard stock models are delivered within 2–4 weeks after order confirmation. Custom configurations take 4–6 weeks. All valves come with a 12-month global quality warranty.

 

 

 

Need a Quote or Technical Support?

 

 

Send us your required model, quantity and application details, and our hydraulic specialists will get back to you within 24 hours with a formal quotation and professional recommendations.

Request a Quote

 

 

Bokin Electro-Hydraulic Technology (Foshan) Co., Ltd. is one of the most experienced 4wrze manufacturers and suppliers in China, featured by quality products and good price. Please rest assured to buy bulk advanced 4wrze in stock here from our factory. Contact us for pricelist and customized service.

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