EATON Vickers CG5V-6GW-D-M-U-H7-11 Pressure Relief Valve
1. Model Code Explanation
- CG5V: 2-stage pilot operated relief valve with solenoid, 20 series
- 6: Mounting pattern AR-06-2-A (ISO 6264 D05)
- GW: G = Pressure range 3–315 bar (44–4500 psi); W = 1/2” NPT conduit box
- D: Coil voltage 220V AC (50Hz) / 240V AC (60Hz)
- M: Non-locking manual adjustment
- U: Electrical connector per ISO 4400 (DIN 43650)
- H7: Coil configuration
- 11: Design revision number
2. Main Technical Specifications
- Max operating pressure: 315 bar (4500 psi)
- Max flow rate: 120 L/min (32 USgpm)
- Pressure adjustment range: 3–315 bar
- Coil power: 18W (DC) / 25VA (AC)
- Response time: 80–120ms (energized); 40–60ms (de-energized)
- Protection class: Standard IP65, optional IP67
- Mounting type: Subplate/manifold mounting (ISO 6264 D05)
- Weight: Approx. 3.8 kg
3. Structure & Operating Principle
This is a 2-stage valve consisting of solenoid pilot stage and main stage with balanced piston.
- De-energized state: Pilot valve closes, pressure builds up on main valve upper chamber, main valve remains closed for system pressure holding.
- Pressure regulation & relief: When system pressure reaches set value, pilot valve opens to relieve pressure on main valve upper chamber, then main valve opens to stabilize system pressure via oil relief.
- Solenoid unloading (energized): Solenoid switches position, pilot circuit connects to tank, main valve fully opens for low-pressure system unloading.
4. Features & Advantages
- Wide pressure range for diverse working conditions
- Compact design with high flow capacity
- Low power loss and heat generation during unloading
- Excellent repeatability, high stability and long service life
- Standard mounting interface for easy replacement
5. Typical Applications
- Pressure control for hydraulic power units
- Injection molding machines, machine tools and construction machinery
- Hydraulic circuits requiring electric remote unloading
- Overpressure protection for high-pressure & high-flow hydraulic systems
6. Installation & Maintenance Guidelines
- Mounting surface flatness: ≤ 0.05 mm; Fastener: M8×4 bolt, tightening torque: 25–30 Nm
- Fluid cleanliness: ISO 4406 18/16/13; Filtration accuracy: ≤ 10 μm
- Standard seal material: Nitrile rubber; Optional: Viton for special media
1. Product Overview
TheEATON Vickers CG5V-6GW-D-M-U-H7-11is a high-performance electromagnetic pressure relief valve belonging to theCG5V series. It features a two-stage control structure that combines the functions of a pilot-operated pressure relief valve and a 2-position, 2-way solenoid valve. Designed for high-pressure, high-flow industrial hydraulic systems, its core functions include system pressure setting, remote unloading, and overload protection, ensuring stable operation and equipment safety.
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2. Technical Features
1. Two-Stage Control Structure:
• Pilot-Operated Pressure Relief Valve: Precisely controls system pressure via a pilot valve for stability.
• 2-Position, 2-Way Solenoid Valve: Enables electrical control for rapid response to system demands.
2. High-Pressure and High-Flow Adaptability:
• Maximum Operating Pressure: 350 bar (5000 psi), suitable for high-pressure applications.
• Maximum Flow Rate: 400 L/min (106 US gpm), ideal for large-flow systems.
3. High-Precision Pressure Control:
• Excellent Pressure Setting Repeatability: Ensures accurate pressure regulation.
• Short Response Time: Approximately 170 ms, suitable for precision processes requiring stable pressure.
4. Reliable Design:
• Conical Valve Structure for Main Valve: Provides reliable sealing with zero internal leakage.
• Fully Hardened Steel Valve Body: Resistant to impact and fatigue, suitable for frequent start-stop and high-pressure shock conditions.
5. Easy Installation and Maintenance:
• Standardized ISO Mounting Face: Directly integrates into hydraulic manifolds, simplifying installation.
• Built-in Pilot Valve: Eliminates the need for additional installation, reducing space and cost.
6. Oil-Immersed Solenoid Operation:
• Actuator Operates Submerged in Oil: Provides smooth, quiet operation even under high pressure and frequent switching.
• Eliminates Friction Leakage: The oil-immersed design removes friction between movable seals and the spool, preventing oil leakage and increasing spool thrust.
7. High Energy Efficiency:
• Low Internal Resistance: Special flow path design minimizes internal pressure loss, improving energy efficiency and aligning with energy-saving trends.
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3. Operating Principle
1. Standby and Pressure Maintenance:
• When inactive, the electromagnetic pilot valve remains in its initial state, and the main valve's upper chamber pressure is precisely controlled by the pilot valve.
• If the system pressure does not reach the pilot valve's set value, the main valve port stays closed, allowing hydraulic fluid to supply system actuators normally and maintain stable operation.
2. Pressure Relief and Stabilization:
• When the system pressure rises to the pilot valve's preset level, the pilot valve activates, altering the pressure in the main valve's upper chamber and opening the main valve port to the appropriate degree.
• Excess hydraulic fluid flows back to the tank through the main valve port, stabilizing the system pressure at the pilot valve's set value and preventing overload.
3. Unloading Control:
• When the solenoid is energized or de-energized (as per system configuration), the 2-position, 2-way solenoid valve operates, connecting a specific part of the pilot valve to the tank.
• The main valve's upper chamber loses pilot valve pressure control, causing the main valve spool to open and allowing hydraulic fluid from the source to return to the tank at extremely low unloading pressure, achieving rapid system unloading.
• The valve returns to normal pressure relief and stabilization mode when the solenoid is reset.
4. Manual Override Operation:
• The valve is equipped with a non-locking manual adjustment mechanism for emergency operation or maintenance. In case of electromagnetic control failure, manual operation allows pressure adjustment to ensure hydraulic system functionality under special conditions.
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4. Applications
1. Heavy-Duty Machine Tools:
• Used for pressure closed-loop control and unloading in CNC machining centers and large presses, ensuring machining accuracy and equipment safety.
2. Metallurgical Equipment:
• Provides overload protection and constant pressure control in rolling mills and forging equipment, extending service life.
3. Construction Machinery:
• Regulates pressure in hydraulic hammers and lifting systems, improving operational efficiency and stability.
4. Energy and Marine:
• Ensures high-pressure safety control in wind turbine yaw systems and hydraulic winches, guaranteeing reliable equipment operation.
