Bokin Electro-Hydraulic Technology (Foshan) Co., Ltd. is one of the leading manufacturers and suppliers of 4WRTE27 A1 Pilot‑Operated Directional Control Valve
±10V Voltage Control | NG27 Size | Integrated OBE | Electrical Position Feedback in China. If you're going to wholesale bulk durable 4WRTE27 A1 Pilot‑Operated Directional Control Valve
±10V Voltage Control | NG27 Size | Integrated OBE | Electrical Position Feedback 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 | NG27 (Component Series 4X) |
| Mounting Standard | ISO 4401‑08‑08‑0‑05 |
| Max Operating Pressure (A/B/P ports, main valve) | 270 bar |
| Max Operating Pressure (T port, external pilot return) | 210 bar |
| Pilot supply pressure range (external) | 25‑315 bar |
| Max Flow | 1000 L/min |
| Rated Flow (Δp = 5 bar per control edge) | 500 L/min |
| Control Signal | A1 interface, ±10 VDC differential input / actual‑value output |
| Input Resistance | 100 kΩ |
| Hysteresis | ≤ 0.1% |
| Response Sensitivity | ≤ 0.05% |
| Zero‑point temperature drift | ＜ 0.3% / 10 °C |
| Supply Voltage | 24 VDC (18 – 35 VDC range) |
| Protection Class | IP65 (correctly mounted connector) |
| Ambient Temperature | -20°C to +50°C |
| Hydraulic Fluid Temperature | -20°C to +80°C |
| Weight | 17.0 kg |
| Optional Features | Spool position monitoring (M, EN 13849‑1 Cat.3/4 PL d/e), electronics protection membrane (-967) |
| Flow Characteristics | L (linear) / P (linear with fine control range) |
| Seal Material | NBR (M) / FKM (V) |
| CE Compliance | MD 2006/42/EC, 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 |
| 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) |
Need a custom spool profile or special configuration? Send us your requirements → Get Custom Solution
Product Key Advantages
1. Closed‑Loop Large‑Capacity Precision Regulation
Pilot‑operated two‑stage architecture fitted with dual inductive position transducers (pilot + main stage). OBE compares command signal and actual spool‑position feedback for real‑time deviation correction. ≤ 0.1% hysteresis and ≤ 0.05% response sensitivity deliver stable performance for high‑flow position, speed and pressure control.
2. Standardized Heavy‑Duty Installation
ISO 4401‑08‑08‑0‑05 porting pattern with Ø32 mm main ports for high‑volume oil passage. 17.0 kg robust valve housing, secured by six M12×60 mounting screws (100‑130 Nm tightening torque). Supports LiYCY 7×1.0 mm² shielded cable up to 50 m, with EMC‑compliant single‑ended PE shielding for long‑distance signal transmission.
3. Broad Fluid Compatibility & Environmental Adaptability
Works with mineral oils, biodegradable and fire‑resistant hydraulic fluids. Viscosity range 20‑380 mm²/s (recommended 30‑45 mm²/s). IP65 protection safeguards against industrial contaminants. Optional electronics protection membrane (-967) prevents condensation in high‑humidity working environments.
4. Enhanced Safety & Maintainability
Automatic pressure compensation inside main‑stage control chambers suppresses pressure spikes. Spring‑centered main spool returns to neutral on de‑energization. Optional spool position monitoring (M version) meets EN 13849‑1 Cat.3/4 PL d/e safety‑related requirements. Modular solenoid‑connector design simplifies on‑site inspection and component replacement.
Compatibility Reference
|
Corresponding Rexroth Model |
BOKIN Equivalent Model |
Core Match Points |
| 4WRTE 27 E-500L-4X/6EG24K31/A1M | 4WRTE 27 E-500L-4X/6EG24K31/A1M | Same ISO 4401 NG27 mounting, ±10V A1 interface, position feedback, hydraulic performance |
| 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 | |
|
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
- Large hydraulic presses & heavy material‑handling equipment
- Steel‑mill hydraulic systems & large‑scale conveyor lines
- Heavy‑duty industrial hydraulic power units
- Large plastic‑molding production machinery
- Closed‑loop high‑flow position‑ / pressure‑control hydraulic circuits
Need larger flow capacity?
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 NG27 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 7×1.0 mm² cable, shield connected to PE only on supply‑side for EMC compliance, max cable length 50 m.
- Gradually ramp‑up system pressure during commissioning. Inspect for leakage and abnormal noise before switching to full‑load operation.
Safety Precautions
- When designing safety‑related controls, observe applicable industry‑specific standards and regulations.
- Fit pressure‑relief valves in the hydraulic circuit for overpressure protection.
- Implement emergency‑stop logic to de‑energize the valve under fault conditions.
- Valves with spool position monitoring must only be installed, adjusted and maintained by trained specialists.
- Zero‑point adjustment shall only be performed by instructed specialists.
FAQ
Q: What is the main difference between 4WRTE27 and 4WREE27?
A: 4WRTE27 has dual‑stage (pilot + main spool) electrical position feedback for closed‑loop high‑precision control (≤ 0.1% hysteresis). 4WREE series does not feature main‑spool position feedback. Both follow corresponding ISO mounting standards.
Q: What is the function of optional "M" spool position monitoring?
A: The M‑option adds inductive spool‑position switches. It outputs switching signals for system monitoring and safety‑related functions, compliant with EN 13849‑1 Category 3/4, PL d/e.
Q: What pilot oil supply modes are available for 4WRTE27?
A: Four standard modes: external pilot & external return (standard), internal pilot supply (E), external pilot & internal return (T), internal pilot & internal return (ET). Select mode according to your hydraulic circuit layout.
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 4WRTE27 A1 configurations ship within 2‑4 weeks after order confirmation.
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