Bokin Electro-Hydraulic Technology (Foshan) Co., Ltd. is one of the leading manufacturers and suppliers of 4WRTE Series Pilot‑Operated Proportional Directional Valves
Integrated OBE | Electrical Position Feedback | NG10‑NG35 Sizes in China. If you're going to wholesale bulk durable 4WRTE Series Pilot‑Operated Proportional Directional Valves
Integrated OBE | Electrical Position Feedback | NG10‑NG35 Sizes 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 Sizes | NG10 / NG16 / NG25 / NG27 / NG32 / NG35 (Component Series 4X) |
| Mounting Standard | ISO 4401‑05‑07‑08‑09‑10 corresponding to each size |
| Max Operating Pressure (A/B/P main ports) | 350 bar (NG27:270 bar) |
| Rated Flow (Δp=5 bar per control edge) | 25‑1000 L/min |
| Peak Flow | Up to 3000 L/min (NG35) |
| Control Interfaces | A1 (±10 V), F1 (4‑20 mA), A5 |
| Hysteresis | ≤ 0.1% |
| Response Sensitivity | ≤ 0.05% |
| Supply Voltage | 24 VDC (18‑35 VDC) |
| Protection Class | IP65 (correctly fitted mating connector) |
| Ambient Temperature | -20°C ~ +50°C |
| Hydraulic Fluid Temperature | -20°C ~ +80°C |
| Flow Characteristic | L‑linear / P‑fine‑tune linear |
| Spool Types | E, E1, W6, W8, V, V1 etc. |
| Pilot Modes | Standard, E‑internal pilot, T‑internal return, ET‑internal pilot & return |
| Seal Options | M(NBR), V(FKM) |
| Optional Features | Spool position monitoring(M, EN 13849‑1 Cat.3/4 PL d/e), electronics protection membrane(-967) |
| CE Compliance | MD 2006/42/EC, EMC 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 |
| 4WRTE 10 E-25L-4X/6EG24K31/A1M |
25 L/min |
Standard zero overlap (E) | |
| 4WRTE 10 E-25L-4X/6EG24EK31/A1M | 25 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-25L-4X/6EG24TK31/A1M | 25 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-25L-4X/6EG24ETK31/A1M | 25 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-50L-4X/6EG24K31/A1M | 50 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-50L-4X/6EG24EK31/A1M | 50 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-50L-4X/6EG24TK31/A1M | 50 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-50L-4X/6EG24ETK31/A1M | 50 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-100L-4X/6EG24K31/A1M | 100 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-100L-4X/6EG24EK31/A1M | 100 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-100L-4X/6EG24EK31/A1M | 100 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-100L-4X/6EG24TK31/A1M | 100 L/min | Standard zero overlap (E) | |
| 4WRTE 10 E-100L-4X/6EG24ETK31/A1M | 100 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-150L-4X/6EG24K31/A1M | 150 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-150L-4X/6EG24EK31/A1M | 150 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-150L-4X/6EG24TK31/A1M | 150 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-150L-4X/6EG24ETK31/A1M | 150 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-220L-4X/6EG24K31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-220L-4X/6EG24EK31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-220L-4X/6EG24TK31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 16 E-220L-4X/6EG24ETK31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-220L-4X/6EG24K31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-220L-4X/6EG24EK31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-220L-4X/6EG24TK31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-220L-4X/6EG24ETK31/A1M | 220 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-350L-4X/6EG24K31/A1M | 350 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-350L-4X/6EG24EK31/A1M | 350 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-350L-4X/6EG24TK31/A1M | 350 L/min | Standard zero overlap (E) | |
| 4WRTE 25 E-350L-4X/6EG24ETK31/A1M | 350 L/min | Standard zero overlap (E) | |
| 4WRTE 27 E-500L-4X/6EG24K31/A1M | 500 L/min | Standard zero overlap (E) | |
| 4WRTE 27 E-500L-4X/6EG24EK31/A1M | 500 L/min | Standard zero overlap (E) | |
| 4WRTE 27 E-500L-4X/6EG24TK31/A1M | 500 L/min | Standard zero overlap (E) | |
| 4WRTE 27 E-500L-4X/6EG24ETK31/A1M | 500 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-400L-4X/6EG24K31/A1M | 400 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-400L-4X/6EG24EK31/A1M | 400 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-400L-4X/6EG24TK31/A1M | 400 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-400L-4X/6EG24ETK31/A1M | 400 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-600L-4X/6EG24K31/A1M | 600 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-600L-4X/6EG24EK31/A1M | 600 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-600L-4X/6EG24TK31/A1M | 600 L/min | Standard zero overlap (E) | |
| 4WRTE 32 E-600L-4X/6EG24ETK31/A1M | 600 L/min | Standard zero overlap (E) | |
| 4WRTE 35 E-1000L-4X/6EG24K31/A1M | 1000 L/min | Standard zero overlap (E) | |
| 4WRTE 35 E-1000L-4X/6EG24EK31/A1M | 1000 L/min | Standard zero overlap (E) | |
| 4WRTE 35 E-1000L-4X/6EG24TK31/A1M | 1000 L/min | Standard zero overlap (E) | |
| 4WRTE 35 E-1000L-4X/6EG24ETK31/A1M | 1000 L/min | Standard zero overlap (E) |
Need a custom spool profile or special configuration? Send us your requirements → Get Custom Solution
Product Key Advantages
1. Closed‑Loop Ultra‑High‑Precision Pilot‑Operated Control
Two‑stage pilot‑operated architecture equipped with dual inductive position transducers on pilot and main spool. OBE compares command signal and actual position feedback for real‑time deviation correction. Achieves ≤ 0.1% hysteresis and ≤ 0.05% response sensitivity, dedicated for position, speed and pressure closed‑loop control.
2. Multi‑Interface Flexible Signal Compatibility
Integrated OBE supports three mainstream interfaces: A1 (±10 V voltage), F1 (4‑20 mA current), A5. Adaptable for short‑distance high‑precision or long‑distance anti‑interference industrial automation scenarios, no extra external amplifier required.
3. Standardized ISO‑4401 Platform & Diverse Options
Full‑range ISO 4401 subplate mounting footprint for direct drop‑in replacement. Multiple pilot oil supply‑return combinations, L/P flow characteristics and rich spool types. Optional spool position monitoring meets EN 13849‑1 functional safety requirements. Dual‑seal choice NBR/FKM supports mineral, biodegradable and flame‑resistant hydraulic fluids.
4. Industrial‑Grade Safety & Harsh‑Environment Reliability
IP65 rated enclosure. Spring‑centered main spool provides fail‑safe centering on power loss. Automatic pressure compensation inside main‑stage control chambers suppresses pressure spikes. Suitable for cyclic damp‑heat, vibration and shock‑prone heavy‑industrial conditions.
Compatibility Reference
|
Corresponding Rexroth Model |
BOKIN Equivalent Model |
Core Match Points |
| 4WRTE 10 E-25L-4X/6EG24K31/A1M | 4WRTE 10 E-25L-4X/6EG24K31/A1M | Identical ISO 4401 mounting, dual‑position feedback, OBE electronics, hydraulic and dynamic performance |
| 4WRTE 10 E-25L-4X/6EG24EK31/A1M | 4WRTE 10 E-25L-4X/6EG24EK31/A1M | |
| 4WRTE 10 E-25L-4X/6EG24TK31/A1M | 4WRTE 10 E-25L-4X/6EG24TK31/A1M | |
| 4WRTE 10 E-25L-4X/6EG24ETK31/A1M | 4WRTE 10 E-25L-4X/6EG24ETK31/A1M | |
| 4WRTE 10 E-50L-4X/6EG24K31/A1M | 4WRTE 10 E-50L-4X/6EG24K31/A1M | |
| 4WRTE 10 E-50L-4X/6EG24EK31/A1M | 4WRTE 10 E-50L-4X/6EG24EK31/A1M | |
| 4WRTE 10 E-50L-4X/6EG24TK31/A1M | 4WRTE 10 E-50L-4X/6EG24TK31/A1M | |
| 4WRTE 10 E-50L-4X/6EG24ETK31/A1M | 4WRTE 10 E-50L-4X/6EG24ETK31/A1M | |
| 4WRTE 10 E-100L-4X/6EG24K31/A1M | 4WRTE 10 E-100L-4X/6EG24K31/A1M | |
| 4WRTE 10 E-100L-4X/6EG24EK31/A1M | 4WRTE 10 E-100L-4X/6EG24EK31/A1M | |
| 4WRTE 10 E-100L-4X/6EG24EK31/A1M | 4WRTE 10 E-100L-4X/6EG24EK31/A1M | |
| 4WRTE 10 E-100L-4X/6EG24TK31/A1M | 4WRTE 10 E-100L-4X/6EG24TK31/A1M | |
| 4WRTE 10 E-100L-4X/6EG24ETK31/A1M | 4WRTE 10 E-100L-4X/6EG24ETK31/A1M | |
| 4WRTE 16 E-150L-4X/6EG24K31/A1M | 4WRTE 16 E-150L-4X/6EG24K31/A1M | |
| 4WRTE 16 E-150L-4X/6EG24EK31/A1M | 4WRTE 16 E-150L-4X/6EG24EK31/A1M | |
| 4WRTE 16 E-150L-4X/6EG24TK31/A1M | 4WRTE 16 E-150L-4X/6EG24TK31/A1M | |
| 4WRTE 16 E-150L-4X/6EG24ETK31/A1M | 4WRTE 16 E-150L-4X/6EG24ETK31/A1M | |
| 4WRTE 16 E-220L-4X/6EG24K31/A1M | 4WRTE 16 E-220L-4X/6EG24K31/A1M | |
| 4WRTE 16 E-220L-4X/6EG24EK31/A1M | 4WRTE 16 E-220L-4X/6EG24EK31/A1M | |
| 4WRTE 16 E-220L-4X/6EG24TK31/A1M | 4WRTE 16 E-220L-4X/6EG24TK31/A1M | |
| 4WRTE 16 E-220L-4X/6EG24ETK31/A1M | 4WRTE 16 E-220L-4X/6EG24ETK31/A1M | |
| 4WRTE 25 E-220L-4X/6EG24K31/A1M | 4WRTE 25 E-220L-4X/6EG24K31/A1M | |
| 4WRTE 25 E-220L-4X/6EG24EK31/A1M | 4WRTE 25 E-220L-4X/6EG24EK31/A1M | |
| 4WRTE 25 E-220L-4X/6EG24TK31/A1M | 4WRTE 25 E-220L-4X/6EG24TK31/A1M | |
| 4WRTE 25 E-220L-4X/6EG24ETK31/A1M | 4WRTE 25 E-220L-4X/6EG24ETK31/A1M | |
| 4WRTE 25 E-350L-4X/6EG24K31/A1M | 4WRTE 25 E-350L-4X/6EG24K31/A1M | |
| 4WRTE 25 E-350L-4X/6EG24EK31/A1M | 4WRTE 25 E-350L-4X/6EG24EK31/A1M | |
| 4WRTE 25 E-350L-4X/6EG24TK31/A1M | 4WRTE 25 E-350L-4X/6EG24TK31/A1M | |
| 4WRTE 25 E-350L-4X/6EG24ETK31/A1M | 4WRTE 25 E-350L-4X/6EG24ETK31/A1M | |
| 4WRTE 27 E-500L-4X/6EG24K31/A1M | 4WRTE 27 E-500L-4X/6EG24K31/A1M | |
| 4WRTE 27 E-500L-4X/6EG24EK31/A1M | 4WRTE 27 E-500L-4X/6EG24EK31/A1M | |
| 4WRTE 27 E-500L-4X/6EG24TK31/A1M | 4WRTE 27 E-500L-4X/6EG24TK31/A1M | |
| 4WRTE 27 E-500L-4X/6EG24ETK31/A1M | 4WRTE 27 E-500L-4X/6EG24ETK31/A1M | |
| 4WRTE 32 E-400L-4X/6EG24K31/A1M | 4WRTE 32 E-400L-4X/6EG24K31/A1M | |
| 4WRTE 32 E-400L-4X/6EG24EK31/A1M | 4WRTE 32 E-400L-4X/6EG24EK31/A1M | |
| 4WRTE 32 E-400L-4X/6EG24TK31/A1M | 4WRTE 32 E-400L-4X/6EG24TK31/A1M | |
| 4WRTE 32 E-400L-4X/6EG24ETK31/A1M | 4WRTE 32 E-400L-4X/6EG24ETK31/A1M | |
| 4WRTE 32 E-600L-4X/6EG24K31/A1M | 4WRTE 32 E-600L-4X/6EG24K31/A1M | |
| 4WRTE 32 E-600L-4X/6EG24EK31/A1M | 4WRTE 32 E-600L-4X/6EG24EK31/A1M | |
| 4WRTE 32 E-600L-4X/6EG24TK31/A1M | 4WRTE 32 E-600L-4X/6EG24TK31/A1M | |
| 4WRTE 32 E-600L-4X/6EG24ETK31/A1M | 4WRTE 32 E-600L-4X/6EG24ETK31/A1M | |
| 4WRTE 35 E-1000L-4X/6EG24K31/A1M | 4WRTE 35 E-1000L-4X/6EG24K31/A1M | |
| 4WRTE 35 E-1000L-4X/6EG24EK31/A1M | 4WRTE 35 E-1000L-4X/6EG24EK31/A1M | |
| 4WRTE 35 E-1000L-4X/6EG24TK31/A1M | 4WRTE 35 E-1000L-4X/6EG24TK31/A1M | |
| 4WRTE 35 E-1000L-4X/6EG24ETK31/A1M | 4WRTE 35 E-1000L-4X/6EG24ETK31/A1M | |
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More models are available; please contact us for additional model options. |
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Note: For system configuration reference only. BOKIN is an independent brand. Please verify specifications before installation.
Typical Applications
- Precision hydraulic test benches & material‑testing machines
- Hydraulic presses, forging equipment & die‑casting machinery
- Metallurgical and steel‑mill process hydraulics
- Mining, shipbuilding and offshore heavy‑duty systems
- High‑precision machine‑tool, automation and closed‑loop positioning systems
Looking for valves without main‑spool position feedback?
Looking for pilot‑operated proportional valve without built‑in electronics?
Installation & Commissioning Guidelines
Installation Notes
- Thoroughly clean oil ports and mating surfaces prior to mounting to exclude contamination.
- Confirm control‑interface type (A1/F1/A5) and 24 VDC supply match valve nameplate before wiring.
- Apply frame‑size‑specific bolt torque according to ISO 4401 specification; tighten mounting screws evenly to avoid housing distortion and internal leakage.
- Preferred horizontal mounting. Ensure tank return line cannot run dry; fit back‑pressure valve if system requires.
- Use shielded LiYCY cable; implement EMC‑compliant single‑ended PE shielding on supply side.
- Ramp‑up system pressure gradually during commissioning; check for leakage and abnormal noise before full‑load operation.
Safety Precautions
- Safety‑related applications shall comply with local machine‑safety standards.
- Install pressure‑relief valves for circuit over‑pressure protection.
- Implement emergency‑stop logic to de‑energize valve under fault conditions.
- Units with spool‑position monitoring must only be installed, adjusted and calibrated by trained specialists.
- Zero‑point calibration work shall be completed by qualified technicians.
FAQ
Q: What is the core difference between 4WRTE and 4WREE?
A: 4WRTE has dual‑stage (pilot + main‑spool) electrical position feedback, achieving closed‑loop ultra‑high‑precision (hysteresis ≤ 0.1%). 4WREE is pilot‑operated proportional valve without main‑spool feedback, open‑loop control.
Q: How do I choose between A1, F1 and A5 interface?
A: A1(±10 V): short‑wiring high‑precision; F1(4‑20 mA): long‑distance, strong anti‑EMI interference; A5 for special multi‑function signal requirements.
Q: What pilot‑supply modes are supported for 4WRTE series?
A: Four modes: external pilot‑external return(default), E‑internal pilot supply, T‑external pilot‑internal return, ET‑internal pilot & internal return. Select according your hydraulic schematic.
Q: Can 4WRTE replace original Rexroth 4WRTE?
A: Yes, same ISO 4401 installation, feedback mechanism and OBE electric interface support drop‑in substitution. Please send complete part‑number for final validation.
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