Bokin Electro-Hydraulic Technology (Foshan) Co., Ltd. is one of the leading manufacturers and suppliers of 4WRTE35 A1 Pilot‑Operated Directional Control Valve
±10V Voltage Control | NG35 Size | Integrated OBE | Electrical Position Feedback in China. If you're going to wholesale bulk durable 4WRTE35 A1 Pilot‑Operated Directional Control Valve
±10V Voltage Control | NG35 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 | NG35 (Component Series 4X) |
| Mounting Standard | ISO 4401‑10‑09‑0‑05 |
| Max Operating Pressure (A/B/P ports, main valve) | 350 bar |
| Max Operating Pressure (T port, external pilot return) | 250 bar |
| External pilot supply pressure range | 25‑315 bar |
| Max Flow | 3000 L/min |
| Rated Flow (Δp = 5 bar per control edge) | 1000 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 | 34.0 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 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. Ultra‑Heavy‑Duty Closed‑Loop Precision Control
Pilot‑operated two‑stage architecture equipped with dual inductive position transducers (pilot + main stage). Integrated OBE compares command signal and actual spool‑position feedback for real‑time deviation correction. ≤ 0.1% hysteresis and ≤ 0.05% response sensitivity deliver stable dynamic performance for ultra‑high‑flow position, speed and pressure control. Built‑in cable‑break detection and undervoltage protection improve system stability for heavy‑load cycles.
2. Heavy‑Duty Standardized Installation & Flexible Configuration
ISO 4401‑10‑09‑0‑05 porting pattern with large‑bore Ø50 mm main ports for ultra‑high‑volume oil passage. 34.0 kg robust valve housing, secured by six M20×100 mounting screws (465‑610 Nm tightening torque). High‑precision machined mounting surface (Rzmax 4) guarantees leak‑free subplate connection. Multiple pilot oil supply modes and dual‑seal options (NBR / FKM) support mineral, biodegradable and flame‑resistant hydraulic fluids.
3. Harsh‑Environment Compatibility
IP65 ingress protection ensures reliable performance in demanding industrial surroundings. Wide fluid viscosity range 20‑380 mm²/s. Adheres to ISO 4406 Class 18/16/13 fluid cleanliness requirement to mitigate component wear for long‑term service life in mining, marine and heavy‑manufacturing environments.
4. Enhanced Functional Safety & Maintainability
Automatic pressure compensation within main‑stage control chambers suppresses pressure spikes. Spring‑centered main spool safely returns to neutral upon power loss. Optional M‑variant spool‑position monitoring fulfils EN 13849‑1 Cat.3/4 PL d/e safety requirements with MTTFd value of 150‑years. Modular connector and solenoid construction simplify on‑site inspection and component replacement, minimizing equipment downtime.
Compatibility Reference
|
Corresponding Rexroth Model |
BOKIN Equivalent Model |
Core Match Points |
| 4WRTE 35 E-1000L-4X/6EG24K31/A1M | 4WRTE 35 E-1000L-4X/6EG24K31/A1M | Same ISO 4401 NG10 mounting, ±10V A1 interface, position feedback, hydraulic performance |
| 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 | |
|
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
- Ultra‑large hydraulic power units & heavy forging presses
- Shipyard cranes and shipbuilding hydraulic systems
- Mining machinery & offshore oil‑gas hydraulic equipment
- Large‑scale construction machinery & industrial turbine hydraulics
- Closed‑loop ultra‑high‑flow position‑ / pressure‑ / speed‑control hydraulic circuits
Need current‑loop anti‑interference control?
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 (465‑610 Nm for M20 screws) to avoid valve‑body deformation and internal leakage, complying with ISO 4401‑10‑09‑0‑05 NG35 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.
- 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 4WRTE35 and 4WREE35?
A: 4WRTE35 features dual‑stage (pilot + main spool) electrical position feedback for closed‑loop ultra‑high‑precision control with hysteresis ≤0.1%. 4WREE series does not incorporate main‑spool position feedback. Both follow corresponding ISO mounting standards.
Q: What is the function of optional "M" spool position monitoring?
A: The optional M‑version adds inductive spool‑position switches for safety‑related two‑channel applications. It complies with EN 13849‑1 Category 3/4, PL d/e with MTTFd value of 150‑years and meets EN 60204 stop category 0 requirements.
Q: What pilot oil supply modes are available for 4WRTE35?
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 4WRTE35 A1 configurations ship within 2‑4 weeks after order confirmation.
Ready to Get a Quote?
Send us your required model, quantity and application details, and our team will reply within 24 hours with a formal quotation.
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