Product Overview
The DG5V-7 series pilot-operated directional valves (including models DG5V-7-6C-T-M-U-H7-30, DG5V-7-6C-2-M-U-H7-30, and the accompanying pilot stage DG4V-3-6C-M-U-H7-60) are manufactured to original Eaton Vickers technical standards. The DG5V-7 belongs to size 07 (NG16 / CETOP 7 / ISO 4401-07 / NFPA D07), while the DG4V-3 belongs to size 03 (NG6 / CETOP 3 / ISO 4401-03). The DG5V-7 features a pilot-operated two-stage design with a high-performance DG4V-3 series solenoid pilot valve. The main spool is positioned by pilot pressure, with a mounting surface conforming to ISO 4401-07, used for controlling the starting, stopping, and direction of fluid flow in medium-to-high flow hydraulic systems.
The DG5V-7-6C-T-M-U-H7-30 features spool type 6C (P blocked, A & B to tank in center, spring centered), internal pilot supply, external pilot drain (T type), 24 VDC wet-pin solenoids (H7 coil), and 30 design. Maximum main stage flow is 300 L/min (80 USgpm) at 350 bar (5075 psi), with a tank port pressure rating of 210 bar (DC solenoid). The DG5V-7-6C-2-M-U-H7-30 features the same 6C spool function with an integrated pilot choke module (type 2) for controlling main spool shift speed. The accompanying pilot stage DG4V-3-6C-M-U-H7-60 features spool type 6C (tandem center, P→T, A/B blocked), 24 VDC wet-pin solenoids with 30 W power consumption, indicator light connector (H7), maximum flow of 80 L/min (21 USgpm) at 350 bar (5075 psi), and tank port rating of 210 bar.
These products are dimensionally and functionally identical to the original Eaton Vickers DG5V-7 and DG4V-3 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-7-6C-T-M-U-H7-30 / DG5V-7-6C-2-M-U-H7-30 / DG4V-3-6C-M-U-H7-60
Product Series: DG5V-7 (Size 07 / NG16 / CETOP 7 / ISO 4401-07 / NFPA D07); DG4V-3 (Size 03 / NG6 / CETOP 3 / ISO 4401-03 / NFPA D03)
Design Number: 30 Design (DG5V-7) / 60 Design (DG4V-3)
Spool Type: 6C (P blocked, A & B to tank in center, spring centered)
Design: DG5V-7 pilot-operated two-stage solenoid valve; DG4V-3 direct-acting solenoid valve (used as pilot stage)
Mounting Pattern: DG5V-7 per ISO 4401-07 / CETOP 7; DG4V-3 per ISO 4401-03 / CETOP 3
Installation Position: Any (spring-centered types)
Hydraulic Parameters (DG5V-7 Main Stage)
Maximum Flow Rate: 300 L/min (80 USgpm)
Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)
Pilot Valve Tank Line Pressure Rating: 210 bar (3000 psi, DC solenoid)
Hydraulic Fluid: Mineral-based hydraulic oil, water glycol, water-oil emulsion
Standard Seals: Viton (FKM)
Fluid Temperature Range: -20°C to +80°C
Filtration: ISO 4406 19/17/14
Main Stage Return: Spring centered (6C)
Pilot Choke: Type 2 (DG5V-7-6C-2-M-U-H7-30 model)
Endurance: Tested to 10 million cycles per NFPA fatigue specifications
Hydraulic Parameters (DG4V-3-6C Pilot Stage)
Maximum Flow Rate: 80 L/min (21 USgpm)
Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)
Maximum Tank Port Pressure (Port T): 210 bar (3045 psi)
Spool Type: 6C (Tandem center, P→T, A/B blocked)
Seal Material: Viton (FKM)
Working Temperature Range: -20°C to +70°C
Endurance: Tested over 20 million cycles
Electrical Parameters (DG5V-7 Main Stage)
Supply Voltage: 24 VDC (H7 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
Duty Cycle: Continuous (ED = 100%)
Electrical Parameters (DG4V-3-6C Pilot Stage)
Supply Voltage: 24 VDC (H7)
Power Consumption: 30 W
Electrical Connector: ISO 4400 / DIN 43650 connector with indicator light (H7)
Energizing Time: 45-28 ms
Protection Class: IP65
Manual Override: Plain design
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-7-6C-T-M-U-H7-30 delivers up to 300 L/min (80 USgpm) flow capacity in size 07 at 350 bar (5075 psi) maximum operating pressure. Solid cast bodies and cored passages provide maximum strength and minimal pressure drop, effectively reducing system energy loss. The main stage spool features spring-centered design, ensuring reliable spool return to the center position upon solenoid de-energization. The 6C spool (Motor Spool) blocks port P and connects ports A/B to tank in the center position, allowing actuators to float or motors to coast to a stop, making it particularly suitable for hydraulic circuits requiring center unloading or floating functions.
2. High-Performance Pilot Valve with High Tank Line Pressure Rating
The valve employs the DG4V-3-6C high-performance pilot valve 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). The DG4V-3 pilot valve has been tested over 20 million cycles with proven fatigue life and endurance. High force solenoids and centering springs assure consistent shifting through a wide range of pressure and silting extremes. The pilot valve features an indicator light connector (H7) for quick on-site solenoid diagnostics.
3. Pilot Choke Module for Smooth Shifting (Type 2)
The DG5V-7-6C-2-M-U-H7-30 features a type 2 pilot choke module that 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-7-6C-T-M-U-H7-30 model, while not equipped with the choke module as standard, can still achieve similar effects with optional pilot choke adjustment.
4. 18 Spool Options for Flexible Circuit Design
The DG*V-7 series offers up to 18 different spool functions including type 0 (open center all ports), type 2 (P blocked, A/B to T), type 6 (P blocked, A/B to T), type 9, and others, meeting diverse hydraulic circuit design requirements. All spools are designed to provide good low-shock, fast-response characteristics, which can be enhanced by optional stroke and/or pilot choke adjustments. An integral P-port pilot pressure generator is optionally available for internally piloted systems.
5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every valve undergoes 100% bench testing prior to shipment, covering 350 bar rated pressure holding, directional response time measurement, internal leakage verification, and solenoid response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original Eaton Vickers valve. 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.
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, suitable for UBE die casting machines and similar large equipment
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
Wind Power Generation: Pitch control system hydraulic directional control
Expert Maintenance Tips
Installation Guidelines
For the DG5V-7 series, spring-centered 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-7 bolt height is 33 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-07 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-3-6C 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. The DG4V-3-6C power consumption is 30 W with energizing time of 45-28 ms. 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-7-6C-2-M-U-H7-30 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.
