4WEH Directional Valve OVERVIEW

4WEH series directional valve is a pilot‑operated electro‑hydraulic spool valve, designed to control the start, stop and flow direction of hydraulic oil for large‑flow heavy‑duty hydraulic systems. It adopts subplate mounting conforming to ISO 4401 standard, fully interchangeable with Rexroth original units for direct replacement. This valve combines a small‑size solenoid pilot valve and a large‑flow main valve, delivering stable switching performance under high‑pressure working conditions

Features and Benefits

• Multiple nominal sizes available: NG10, NG16, NG25, NG32, maximum working pressure up to 350 bar, maximum flow rate reaches 1100 L/min.

• Support internal or external pilot oil supply and drain, adjustable by internal plug configuration.

• Wet‑pin AC and DC solenoid coils optional, covering common voltages: DC12V, DC24V, AC110V, AC220V.

• Optional manual override for emergency manual operation during power failure.

• Multiple spool function options, spring‑centered or hydraulic‑centered structure for different circuit requirements.

• IP65 protection grade, compatible with standard mineral hydraulic oil, suitable for harsh industrial working environments.

Specifications 4WEH Directional Valve

Hydraulic Data

• Valve type: Pilot‑operated electro‑hydraulic spool directional valve

• Nominal size: NG10, NG16, NG25, NG32

• Mounting pattern: Subplate mounting to ISO 4401

• Max. working pressure (P, A, B ports): 350 bar

• Max. pressure (T port): 250 bar (external pilot drain); 160‑210 bar (internal pilot drain)

• Max. flow rate: NG10‑120 L/min; NG16‑300 L/min; NG25‑650 L/min; NG32‑1100 L/min

• Pilot oil mode: Internal or external pilot supply & drain (convertible by plug)

• Min. pilot pressure: 7‑14 bar (depends on spool function and valve size)

• Max. pilot pressure: 250 bar

Electrical Data

• Solenoid type: Wet‑pin solenoid

• Available voltages: DC12V, DC24V; AC110V, AC220V (50/60 Hz)Finotek

• Protection class: IP65

• Connector standard: EN 175301‑803

• Optional feature: Manual override for emergency operation

Fluid & Environment

• Recommended fluid: Mineral hydraulic oil HL / HLP per DIN 51524

• Viscosity range: 2.8 ~ 500 mm²/s

• Fluid temperature: ‑30 °C ~ +80 °C (NBR seal); ‑20 °C ~ +80 °C (FKM seal)

• Filtration requirement: ISO 4406 class 20/18/15

• Spool options: Multiple spool symbols (D, E, J, H, etc.), spring‑centered or hydraulic‑centered

• Optional accessories: Throttle insert for switching‑time adjustment, pressure reducing valve

General

• Body material: Cast iron

• Interchangeability: Direct replacement for Rexroth original 4WEH series

• OEM service: Available

Applications

• 4WEH pilot‑operated electro‑hydraulic directional valves are designed for high‑pressure and large‑flow hydraulic circuits. 4WEH

• They reliably control direction, start‑stop of hydraulic cylinders and hydraulic motors under heavy‑load working conditions.

• Widely used for hydraulic presses, forging and metal‑forming machinery, offering stable ram movement for heavy‑duty metal processing.

• Ideal for large injection molding and die‑casting machines to manage clamping, injection and ejection cycles.

• Suitable for metallurgical equipment such as rolling mills and continuous‑casting lines, performing continuous operation under high‑pressure and dusty environments.

• Also applied in machine tools, concrete pumps, port machinery, marine hydraulic systems and heavy‑duty hydraulic power units.

• Perfect for system retrofitting and replacement projects, direct interchangeable with Rexroth original units, fits both new‑build and maintenance‑oriented hydraulic systems.

Packaging & Delivery

4WEH Directional Valve are typically packaged securely to prevent damage during transit. The packaging includes:

Protective Wrapping: To safeguard the pump from environmental damage.

Custom Crates: For larger, heavier pumps, ensuring safe handling.

Documentation: Includes installation, maintenance instructions, and warranty details.

Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.

4WEH Directional Valve FAQ:

1. What is the 4WEH Directional Valve ?

The 4WEH directional valve is a pilot‑operated electro‑hydraulic spool valve for heavy‑duty hydraulics. It controls the start, stop and flow direction of hydraulic cylinders and motors, with ISO 4401 subplate mounting, multiple sizes, up to 350 bar pressure and 1100 L/min flow. It can directly replace Rexroth 4WEH series for new machines and maintenance.

2. What makes the 4WEH Directional Valve ?

3. What is the working pressure range of 4WEH Directional Valve ?

Its maximum working pressure for P, A and B ports is 350 bar. The T‑port pressure is 250 bar for external pilot drain and 160‑210 bar for internal pilot drain, while the maximum pilot pressure reaches 250 bar.

4. Can 4WEH Directional Valve replace other brands?

7. How can I get a quotation quickly

Please provide the following details:

• Model or displacement

• Working pressure

• Speed

• Quantity
  We will reply within 12 hours with a competitive quotation.

  
  

Certifications & Quality Assurance

4WEH Directional Valve are manufactured in compliance with international standards, ensuring high performance and reliability:

ISO 9001: Certified for quality management systems.

CE Certification: Ensures compliance with European safety, health, and environmental protection standards.

RoHS Compliance: Ensures the pump does not contain hazardous materials.

Factory Testing: Every pump is rigorously tested for performance, pressure, and leak integrity before shipping.

FAQ

1.What's our advantages?

Factory established in 2005;

With a great deal of production experience;

80+ employees become the professional team;

Constant updated ERP system ensure efficiency of work;

Sophisticated equipment ehanced the accuracy of products;

Professional salesmen provide the greast service;

With a large number of famous customers all over the world;

Great after-sales service;

With the long term cooperation with famous logistics and express company in China,provide the better goods service.

2.What is your payment terms?

Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.

3.Can you make my own brand on the products?

Of course we can. Just send me your logo  we can make it for you.

4.What is our main export market?

America(40.5%):USA, Canada, Argentina, Brazil

Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.

Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.

Others(5.8%).

The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.

The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.