Product Overview
The DG5V-5-2C-2-T-M-U-H7-10 and DG5V-8-H-2A-E-M-U-H-10 series pilot-operated directional valves are manufactured to original Eaton Vickers technical standards, covering two frame sizes: DG5V-5 (Size 05 / NG10 / CETOP 5 / ISO 4401-05) and DG5V-8 (Size 08 / NG25 / CETOP 8 / ISO 4401-08). Both series feature a pilot-operated two-stage design with high-performance DG4V-3 series solenoid pilot valves. The main spool is positioned by pilot pressure, with a mounting surface conforming to ISO 4401 standards, used for controlling the starting, stopping, and direction of fluid flow in medium-to-high flow hydraulic systems.
The DG5V-5-2C-2-T-M-U-H7-10 features spool type 2C (closed center, P/A/B/T all blocked), spring centered, internal pilot supply, external pilot drain (T type), equipped with 24 VDC wet-pin solenoids (H7 coil), pilot choke module (type 2), and 10 design. Maximum main stage flow is 160 L/min (42 USgpm) at 315 bar (4567 psi) maximum operating pressure, with a pilot valve tank line pressure rating of 210 bar (3000 psi) and Viton (FKM) seal material. The DG5V-8-H-2A-E-M-U-H-10 features spool type 2A (closed center, spring offset), equipped with 24 VDC wet-pin solenoids, internal pilot supply, external pilot drain, with maximum main stage flow of 700 L/min (185 USgpm) at 350 bar (5075 psi).
These products are dimensionally and functionally identical to the original Eaton Vickers DG5V series valves. The DG3V and DG5V are 100% interchangeable with previous H8 design valves, enabling direct drop-in replacement without modifying piping or control programs. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, directional response verification, internal leakage measurement, and solenoid response characterization.
Technical Specifications
General Specifications
Model: DG5V-5-2C-2-T-M-U-H7-10 / DG5V-8-H-2A-E-M-U-H-10
Product Series: DG5V-5 (Size 05 / NG10 / CETOP 5 / ISO 4401-05); DG5V-8 (Size 08 / NG25 / CETOP 8 / ISO 4401-08)
Design Number: 10 Design
Spool Type: 2C (Closed center, P/A/B/T all blocked, spring centered) / 2A (Closed center, spring offset)
Design: Solenoid controlled, pilot operated, two-stage directional control valve
Mounting Pattern: DG5V-5 per ISO 4401-05 / CETOP 5; DG5V-8 per ISO 4401-08 / CETOP 8 / NFPA D08
Installation Position: Spring centered/offset: unrestricted; Detent: horizontal
Hydraulic Parameters (DG5V-5-2C-2-T-M-U-H7-10)
Maximum Flow Rate: 160 L/min (42 USgpm)
Maximum Operating Pressure (Ports P/A/B): 315 bar (4567 psi)
Pilot Valve Tank Line Pressure Rating: 210 bar (3000 psi, DC solenoid)
Hydraulic Fluid: Mineral-based hydraulic oil, water glycol
Standard Seals: Viton (FKM)
Fluid Temperature Range: -20°C to +80°C
Filtration: ISO 4406 19/17/14
Main Stage Return: Spring centered (2C)
Pilot Choke: Type 2 (hydraulic damping adjustment module, controls main spool shift speed)
Hydraulic Parameters (DG5V-8-H-2A-E-M-U-H-10)
Maximum Flow Rate: 700 L/min (185 USgpm)
Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)
Pilot Valve Tank Line Pressure Rating: 210 bar (3000 psi)
Hydraulic Fluid: Mineral-based hydraulic oil, water glycol, water-oil emulsion
Standard Seals: Viton (FKM)
Main Stage Return: Spring offset (2A)
Endurance: Tested to 10 million cycles per NFPA fatigue specifications
Pilot Control Parameters
Pilot Valve Model: DG4V-3 series high-performance pilot valve (H type)
Pilot Valve Size: 03 (NG6 / CETOP 3)
Pilot Valve Maximum Flow: 80 L/min
Pilot Supply: Internal
Pilot Drain: External (E type / T type)
Minimum Pilot Pressure: Refer to catalog minimum pilot pressure requirements
Electrical Parameters
Supply Voltage: 24 VDC (H7 / H coil)
Solenoid Type: Wet armature solenoid with interchangeable coil
Electrical Connector: ISO 4400 / DIN 43650 standard connector (U type)
Protection Class: IP65 (with standard connector)
Manual Override: Plain manual override standard; waterproof and lockable optional
Coil Insulation: Class H
Response Time: Refer to catalog curves
Duty Cycle: Continuous (ED = 100%)
Materials & Construction
Valve Body: Solid cast body with cored passages for maximum strength and minimal pressure drop
Control Spool: Carburized steel, precision ground
Seals: Viton (FKM) standard
Surface Treatment: Phosphating / anti-corrosion coating
Weight
Key Technical Advantages
1. Pilot-Operated Two-Stage Control with High Flow Capacity
The DG5V-5-2C-2-T-M-U-H7-10 delivers up to 160 L/min (42 USgpm) flow capacity in size 05, while the DG5V-8-H-2A-E-M-U-H-10 achieves maximum flow of 700 L/min (185 USgpm) in size 08 at 350 bar (5075 psi). Both series feature solid cast bodies and cored passages for maximum strength and minimal pressure drop, effectively reducing system energy loss. The main stage spool features spring-centered (2C) or spring-offset (2A) design, ensuring reliable spool return to a safe position upon solenoid de-energization.
2. High-Performance Pilot Valve with High Tank Line Pressure Rating
The valve employs the DG4V-3 series high-performance pilot valve (H type) with a tank line pressure rating of 210 bar (3000 psi), significantly higher than the standard performance pilot valve rating of 100 bar (1450 psi). High force solenoids and centering springs assure consistent shifting through a wide range of pressure and silting extremes. Pilot stage spring offset, spring centered, and detented configurations are available to suit system requirements.
3. Multiple Spool Options for Flexible Circuit Design
The DG5V-5 series offers multiple interchangeable spool functions: 2C (closed center), 0 (open center all ports), 2 (closed center P, A/B to T), 6 (tandem center P→T, A/B blocked), and others. The DG5V-8 series similarly offers a wide range of spool function options. The multiple function combinations meet diverse hydraulic circuit design requirements, from simple directional switching to center unloading, differential circuits, and floating circuits. All spools are designed to provide good low-shock, fast-response characteristics, which can be enhanced by an optional pilot choke module.
4. Pilot Choke Module for Smooth Shifting
The DG5V-5-2C-2-T-M-U-H7-10 features a type 2 pilot choke module (hydraulic damping adjustment), which controls the main spool shift speed by adjusting the pilot oil circuit throttling, effectively reducing hydraulic shock and pressure peaks in the circuit for smooth shifting. This module is particularly suitable for applications sensitive to shifting shock, significantly extending system component life. The DG5V-8-H-2A-E-M-U-H-10 also supports optional pilot choke adjustment.
5. Durability-Tested High Reliability Design and Drop-in Interchangeability
The DG5V series valves have been endurance tested to 10 million cycles and fatigue tested to NFPA standards, ensuring the highest reliability in high flow and pressure applications. The DG3V and DG5V are 100% interchangeable with previous H8 design valves, enabling direct drop-in replacement without modifying piping or control programs. Standard Viton (FKM) seals are compatible with mineral-based and water-glycol hydraulic fluids. Every valve undergoes 100% bench testing prior to shipment, covering rated pressure holding, directional response time measurement, internal leakage verification, and solenoid response characterization.
Application Areas
Injection Molding Machines: Directional control for large injection molding machine mold closing, injection, and ejector medium-to-high flow hydraulic circuits
Hydraulic Presses: Main cylinder directional control and fast/slow speed switching for medium-to-large tonnage presses
Die Casting Machines: High-flow directional control for shot systems
Metallurgical Equipment: High-flow directional control for continuous casting machines and rolling mill auxiliary hydraulic systems
Construction Machinery: Main hydraulic circuit directional control for excavators and cranes
Marine Hydraulics: Steering gear control and deck machinery high-flow directional control
Testing Equipment: Hydraulic loading direction control for large material testing machines
Concrete Pump Trucks: High-flow directional control for pumping system main circuits
Expert Maintenance Tips
Installation Guidelines
For the DG5V-5/DG5V-8 series, spring-centered and spring-offset models have unrestricted mounting positions; detent models (no-spring mechanical detent) must be installed with the valve spool in the horizontal position for good machine reliability. Mounting surface flatness must be ≤ 0.05 mm. The DG5V-8 bolt height is 42.5 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401 for direct installation on standard subplates or manifolds.
Thoroughly flush all piping circuits before installation. Recommended cleaning methods are sandblasting, wire brushing and pickling. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes. Recommended fluid cleanliness is ISO 4406 19/17/14 or better.
Y-Port (Pilot Drain) Management: This valve uses external pilot drain. The Y-port must be piped directly to the tank; back pressure cannot be tolerated at this valve port. If pilot pressure exceeds 210 bar, a reducer module is required.
Electrical Grounding: On solenoid operated directional valves, ensure an electrical ground is connected to the valve to prevent the possibility of a shock hazard if a coil develops a short circuit to the frame. Electrical connections must use a U type connector conforming to ISO 4400/DIN 43650 to maintain IP65 protection. Control signal cables should be shielded, with the shield grounded at one end.
Routine Maintenance Procedures
Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 19/17/14 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits. Ensure the entire system is flushed to remove paint, metal chips, welding shot, etc..
Pilot Valve Maintenance: Periodically inspect the DG4V-3 pilot stage for proper operation and stable pilot pressure. Pilot valve tank line pressure must not exceed 210 bar. If main stage shifting is abnormal, first check the pilot valve filter for blockage.
Solenoid Electrical Inspection: Periodically inspect connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. Plain manual overrides are standard; waterproof and lockable manual overrides are optional.
Pilot Choke Maintenance: The type 2 pilot choke module of the DG5V-5-2C-2-T-M-U-H7-10 can be adjusted via the adjusting screw to control main spool shift speed. To adjust, back off the lock-nut, slowly turn the adjusting screw, and re-tighten after adjustment. Adjustments should only be conducted by trained specialists.
Shifting Performance Verification: Periodically check each position for smooth shifting and absence of binding. If shifting response becomes sluggish or internal leakage increases, inspect spool wear and fluid contamination levels.
Seal Replacement: Standard Viton (FKM) seals compatible with mineral-based and water-glycol hydraulic fluids. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.
