Welcome to Ningbo Hyforce Hydraulic Machinery Co., Ltd.
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4WEH25E6X/G12ETZ5L, 4WEH25E6X/G24ETZ5L, 4WEH25E6X/W110ETZ5L, 4WEH25E6X/W220ETZ5L, 4WEH25G6X/G12ETZ5LP4.5, 4WEH25G6X/G24ETZ5LP4.5, 4WEH25G6X/W110ETZ5LP4.5, 4WEH25G6X/W220ETZ5LP4.5, etc.
HYFORCE HYDRAULICS / OEM is also avaliable.
A13-A14
Overview
The 4WEH25 is a heavy-duty pilot-operated electro-hydraulic directional control valve designed for extreme-flow, high-pressure hydraulic systems requiring superior performance and reliability. As a NG25 / CETOP 8 size valve, it represents the upper tier of standard industrial directional controls, capable of managing massive hydraulic power outputs while maintaining precise, responsive operation through its sophisticated two-stage architecture.
Key Functions
High-Capacity Two-Stage Design: Low-power pilot solenoids (typically 24V DC/30W) control a hydraulically-piloted main stage, enabling management of flows exceeding 500 L/min with minimal electrical infrastructure requirements
Massive Flow Handling: Engineered for systems requiring extreme oil volumes for rapid large-bore cylinder movement or high-speed motor operation
Precision Modulation: Optional proportional pilot controls allow stepless main spool positioning for smooth acceleration/deceleration profiles in sensitive machinery
Advanced Hydraulic Piloting: External or internal pilot pressure options provide flexibility for open-center and closed-center hydraulic circuits
Integrated Safety Features: Available with spool position monitoring, manual emergency operation, and fail-safe spring return configurations for critical applications
Primary Applications
Industry Sector | Equipment Types |
|---|---|
Heavy Construction & Mining | Large excavators (50+ tons), mining shovels, draglines, tunnel boring machines |
Metal Forming & Fabrication | Heavy-duty hydraulic presses (2000+ tons), forging presses, extrusion equipment |
Marine & Offshore Engineering | Deck cranes, anchor handling winches, subsea ROV launch systems, oil rig drawworks |
Energy & Infrastructure | Hydroelectric turbine governors, wind turbine pitch/yaw systems, dam gate controls |
Material Handling | Heavy-lift cranes, container handling equipment, steel mill charging machines |
Specialized Industrial | Aircraft hydraulic test stands, shipyard syncrolift systems, heavy transport hydraulic gantries |
Detailed Usage Scenarios
Scenario 1: Ultra-Heavy Hydraulic Press (5000-Ton Forging Application) In aerospace and heavy machinery manufacturing, the 4WEH25 serves as the primary directional control for massive forging presses shaping titanium aircraft components. The valve manages 800-1200 L/min flow during the rapid approach phase, then transitions seamlessly to high-pressure forging mode (350-400 bar) with precise flow modulation to maintain constant deformation rates. The pilot-operated architecture allows the press control system to use standard industrial PLC outputs despite the enormous hydraulic power (15+ MW) being controlled, while integrated shock suppression prevents die damage during material contact.
Scenario 2: Large Mining Excavator (100-Ton Class) For surface mining operations, the 4WEH25 controls the primary boom, stick, and bucket cylinders of 100-ton hydraulic excavators loading 50-ton mining trucks. When the operator commands a bucket curl through the joystick, the valve directs 400+ L/min to the bucket cylinders, generating breakout forces exceeding 500 kN to penetrate compacted ore. The valve's fast response time (<100ms) ensures precise bucket positioning for clean truck loading, while its robust construction withstands continuous 24/7 operation in abrasive, high-vibration environments with ambient temperatures reaching 50°C.
Scenario 3: Offshore Platform Heavy-Lift Crane On deep-water oil platforms, the 4WEH25 manages the main hoist and luffing systems of cranes lifting 2000+ ton subsea modules. The valve operates in a redundant configuration (dual valves per function) to meet API safety standards, controlling flows up to 500 L/min to position loads with millimeter precision despite vessel motion and wind. Specialized marine-grade coatings and sealed pilot chambers prevent saltwater ingress during storm conditions, while the valve's low internal leakage (<5 drops/min) maintains load-holding security during extended periods without pump flow.
Scenario 4: Hydroelectric Turbine Governor System In 100+ MW hydroelectric plants, the 4WEH25 controls the wicket gate servomotors that regulate water flow to the turbine runner. The valve's precise flow control enables frequency regulation within ±0.05 Hz of grid requirements, responding to load changes in <2 seconds. Its high flow capacity allows rapid gate closure (emergency shutdown in <15 seconds) to prevent turbine runaway, while the fail-safe spring-return configuration ensures automatic closure upon electrical or hydraulic system failure—critical for dam safety.
Scenario 5: Wind Turbine Yaw Drive System (Offshore 10+ MW) For next-generation offshore wind turbines with 200-meter rotors, the 4WEH25 controls the yaw motors that rotate the nacelle into the wind. The valve manages 400+ L/min to multiple yaw drives simultaneously, overcoming bearing friction and wind loads up to 2000 kN·m. Operating in corrosive offshore environments with limited maintenance access, the valve's 20+ year design life and sealed construction prevent degradation from salt spray and humidity. Proportional control versions enable smooth nacelle rotation at 0.5°/s to minimize structural stress.
Scenario 6: Shipyard Syncrolift System In naval and commercial shipyards, the 4WEH25 controls the hydraulic jacking system of syncrolifts (ship elevators) raising 10,000+ ton vessels from water to repair berths. Multiple valves operate in synchronized groups to lift 40+ lifting points simultaneously within 10mm height differential, preventing hull stress. The valve's precise flow sharing and high capacity (800 L/min per unit) enable 2-meter lifting cycles in 20 minutes, while manual override capabilities allow emergency lowering independent of the control system.
Technical Specifications
Parameter | Specification |
|---|---|
Nominal Size | NG25 / CETOP 8 (ISO 4401-08) |
Maximum Operating Pressure | 350 bar (5,075 psi) - main stage; 315 bar - pilot stage |
Maximum Flow Rate | 500 L/min (132 gpm) @ 10 bar ΔP (standard spool) |
Pilot Flow Requirement | 15-25 L/min depending on shift speed requirements |
Pilot Solenoid Options | 24V DC (standard), 12V DC, 110V AC, 220V AC, proportional (4-20mA/0-10V) |
Response Time | 60-120ms (pilot pressure dependent) |
Internal Leakage | <50 ml/min (A/B to T at 100 bar) |
Operating Temperature Range | -30°C to +80°C (standard seals); -40°C to +100°C (special seals) |
Viscosity Range | 10-800 mm²/s (optimal: 20-100 mm²/s) |
Filtration Requirement | ISO 4406 20/18/15 (minimum); 18/16/13 (recommended for proportional versions) |
Mounting Interface | ISO 4401-08, NFPA D08, CETOP 8 |
Weight | 18 kg depending on configuration |
Configuration Options
Spool Types: Spring-centered, detented, proportional, overlapping/underlapping for specific circuit requirements
Pilot Options: Internal/external pilot supply, external pilot drain for tank line pressure immunity
Control Variants: On/off solenoid, proportional with integrated electronics (OBE), hydraulic pilot only for remote pilot valve mounting
Monitoring: Mechanical position indicators, proximity switches, 4-20mA position feedback for closed-loop control
Special Features: Stroke limiters, pilot chokes for adjustable shift times, pre-load valves for high-pressure applications
The 4WEH25 represents the pinnacle of industrial directional valve technology, bridging the gap between standard hydraulic components and custom-engineered solutions. Its exceptional flow capacity and robust construction make it indispensable for applications where reliability, precision, and massive power handling converge—typically in infrastructure-critical equipment where valve failure would result in catastrophic downtime or safety hazards.
Overview
The 4WEH25 is a heavy-duty pilot-operated electro-hydraulic directional control valve designed for extreme-flow, high-pressure hydraulic systems requiring superior performance and reliability. As a NG25 / CETOP 8 size valve, it represents the upper tier of standard industrial directional controls, capable of managing massive hydraulic power outputs while maintaining precise, responsive operation through its sophisticated two-stage architecture.
Key Functions
High-Capacity Two-Stage Design: Low-power pilot solenoids (typically 24V DC/30W) control a hydraulically-piloted main stage, enabling management of flows exceeding 500 L/min with minimal electrical infrastructure requirements
Massive Flow Handling: Engineered for systems requiring extreme oil volumes for rapid large-bore cylinder movement or high-speed motor operation
Precision Modulation: Optional proportional pilot controls allow stepless main spool positioning for smooth acceleration/deceleration profiles in sensitive machinery
Advanced Hydraulic Piloting: External or internal pilot pressure options provide flexibility for open-center and closed-center hydraulic circuits
Integrated Safety Features: Available with spool position monitoring, manual emergency operation, and fail-safe spring return configurations for critical applications
Primary Applications
Industry Sector | Equipment Types |
|---|---|
Heavy Construction & Mining | Large excavators (50+ tons), mining shovels, draglines, tunnel boring machines |
Metal Forming & Fabrication | Heavy-duty hydraulic presses (2000+ tons), forging presses, extrusion equipment |
Marine & Offshore Engineering | Deck cranes, anchor handling winches, subsea ROV launch systems, oil rig drawworks |
Energy & Infrastructure | Hydroelectric turbine governors, wind turbine pitch/yaw systems, dam gate controls |
Material Handling | Heavy-lift cranes, container handling equipment, steel mill charging machines |
Specialized Industrial | Aircraft hydraulic test stands, shipyard syncrolift systems, heavy transport hydraulic gantries |
Detailed Usage Scenarios
Scenario 1: Ultra-Heavy Hydraulic Press (5000-Ton Forging Application) In aerospace and heavy machinery manufacturing, the 4WEH25 serves as the primary directional control for massive forging presses shaping titanium aircraft components. The valve manages 800-1200 L/min flow during the rapid approach phase, then transitions seamlessly to high-pressure forging mode (350-400 bar) with precise flow modulation to maintain constant deformation rates. The pilot-operated architecture allows the press control system to use standard industrial PLC outputs despite the enormous hydraulic power (15+ MW) being controlled, while integrated shock suppression prevents die damage during material contact.
Scenario 2: Large Mining Excavator (100-Ton Class) For surface mining operations, the 4WEH25 controls the primary boom, stick, and bucket cylinders of 100-ton hydraulic excavators loading 50-ton mining trucks. When the operator commands a bucket curl through the joystick, the valve directs 400+ L/min to the bucket cylinders, generating breakout forces exceeding 500 kN to penetrate compacted ore. The valve's fast response time (<100ms) ensures precise bucket positioning for clean truck loading, while its robust construction withstands continuous 24/7 operation in abrasive, high-vibration environments with ambient temperatures reaching 50°C.
Scenario 3: Offshore Platform Heavy-Lift Crane On deep-water oil platforms, the 4WEH25 manages the main hoist and luffing systems of cranes lifting 2000+ ton subsea modules. The valve operates in a redundant configuration (dual valves per function) to meet API safety standards, controlling flows up to 500 L/min to position loads with millimeter precision despite vessel motion and wind. Specialized marine-grade coatings and sealed pilot chambers prevent saltwater ingress during storm conditions, while the valve's low internal leakage (<5 drops/min) maintains load-holding security during extended periods without pump flow.
Scenario 4: Hydroelectric Turbine Governor System In 100+ MW hydroelectric plants, the 4WEH25 controls the wicket gate servomotors that regulate water flow to the turbine runner. The valve's precise flow control enables frequency regulation within ±0.05 Hz of grid requirements, responding to load changes in <2 seconds. Its high flow capacity allows rapid gate closure (emergency shutdown in <15 seconds) to prevent turbine runaway, while the fail-safe spring-return configuration ensures automatic closure upon electrical or hydraulic system failure—critical for dam safety.
Scenario 5: Wind Turbine Yaw Drive System (Offshore 10+ MW) For next-generation offshore wind turbines with 200-meter rotors, the 4WEH25 controls the yaw motors that rotate the nacelle into the wind. The valve manages 400+ L/min to multiple yaw drives simultaneously, overcoming bearing friction and wind loads up to 2000 kN·m. Operating in corrosive offshore environments with limited maintenance access, the valve's 20+ year design life and sealed construction prevent degradation from salt spray and humidity. Proportional control versions enable smooth nacelle rotation at 0.5°/s to minimize structural stress.
Scenario 6: Shipyard Syncrolift System In naval and commercial shipyards, the 4WEH25 controls the hydraulic jacking system of syncrolifts (ship elevators) raising 10,000+ ton vessels from water to repair berths. Multiple valves operate in synchronized groups to lift 40+ lifting points simultaneously within 10mm height differential, preventing hull stress. The valve's precise flow sharing and high capacity (800 L/min per unit) enable 2-meter lifting cycles in 20 minutes, while manual override capabilities allow emergency lowering independent of the control system.
Technical Specifications
Parameter | Specification |
|---|---|
Nominal Size | NG25 / CETOP 8 (ISO 4401-08) |
Maximum Operating Pressure | 350 bar (5,075 psi) - main stage; 315 bar - pilot stage |
Maximum Flow Rate | 500 L/min (132 gpm) @ 10 bar ΔP (standard spool) |
Pilot Flow Requirement | 15-25 L/min depending on shift speed requirements |
Pilot Solenoid Options | 24V DC (standard), 12V DC, 110V AC, 220V AC, proportional (4-20mA/0-10V) |
Response Time | 60-120ms (pilot pressure dependent) |
Internal Leakage | <50 ml/min (A/B to T at 100 bar) |
Operating Temperature Range | -30°C to +80°C (standard seals); -40°C to +100°C (special seals) |
Viscosity Range | 10-800 mm²/s (optimal: 20-100 mm²/s) |
Filtration Requirement | ISO 4406 20/18/15 (minimum); 18/16/13 (recommended for proportional versions) |
Mounting Interface | ISO 4401-08, NFPA D08, CETOP 8 |
Weight | 18 kg depending on configuration |
Configuration Options
Spool Types: Spring-centered, detented, proportional, overlapping/underlapping for specific circuit requirements
Pilot Options: Internal/external pilot supply, external pilot drain for tank line pressure immunity
Control Variants: On/off solenoid, proportional with integrated electronics (OBE), hydraulic pilot only for remote pilot valve mounting
Monitoring: Mechanical position indicators, proximity switches, 4-20mA position feedback for closed-loop control
Special Features: Stroke limiters, pilot chokes for adjustable shift times, pre-load valves for high-pressure applications
The 4WEH25 represents the pinnacle of industrial directional valve technology, bridging the gap between standard hydraulic components and custom-engineered solutions. Its exceptional flow capacity and robust construction make it indispensable for applications where reliability, precision, and massive power handling converge—typically in infrastructure-critical equipment where valve failure would result in catastrophic downtime or safety hazards.
