DG3V DG5V DG4V DG5S DG3V-8-2C-10 Hydraulic Solenoid Directional Control Valve DG5V-8-H-2C-T-M-U-D-10

I. Technical Parameters
Maximum flow rate: 700 L/min (185 USgpm
Maximum working pressure: 350 bar (5000 psi)
Valve port connection: ISO 4401-08 (CETOP 8S) standard plate mounting
Weight: Approximately 7.3 kg (16.1 lb) (excluding the electromagnet)
Valve core type: 2C type (spring pair medium-sized), three-position four-way
Pilot pressure range: Internal pilot ≥20 bar, external pilot ≥5 bar
Response time
Power-on: ≤75 ms (AC), ≤90 ms (DC)
Power-off: ≤40 ms (AC), ≤45 ms (DC)
Voltage specification
Dc: 12V, 24V, 48V, 110V, 220V
Ac: 24V, 110V, 220V, 380V (50/60Hz)
Power consumption
Ac: 37W (110V/60Hz), 154W (230V/60Hz)
Dc: Approximately 30W
Protection grade: IP65 (Dust and water resistant)
Ambient temperature: -20℃ to +65℃Ii. Working Principle
DG3V-8-2C-10 is a pilot-operated three-position four-way electromagnetic directional control valve, featuring a two-stage control structure:
Pilot stage: Composed of an electromagnetic coil, a pilot valve core and a reset spring
When the coil is energized → a magnetic field is generated → the iron core is attracted → the pilot valve core is pushed to move
When power is cut off, the spring pushes the pilot valve core back to the center position
Main stage: Composed of the main valve core, reset spring and pilot piston
The pilot valve core moves → changes the pressure distribution at the pilot oil port → drives the main valve core to act
The position of the main valve core determines the connection status of the P, A, B and T oil ports
Valve core function (2C type) :
Power failure (median) : Port P is closed, while ports A and B are connected to port T
When an electromagnet A is energized: P→A, B→T
When the B electromagnet is energized: P→B, A→T

Iii. Product Features and Advantages
High pressure and large flow rate: It can operate under a pressure of 350 bar and has a flow rate of up to 700 L/min, making it suitable for high-pressure and heavy-load systems
Low impact feature: The valve core design is optimized to reduce reversing impact and extend the system’s lifespan
Compact design: Compact structure, small space occupation, and convenient for equipment integration
Multiple control options
Internal/external leading pressure
Internal/external pilot oil drain
Stroke limit and hydraulic damping (optional)
High reliability
The wet electromagnet design ensures good heat dissipation and a long service life
The valve core is wear-resistant treated and suitable for frequent operation
It has strong anti-pollution ability and can adapt to harsh working conditions
Easy to maintain
Modular design, easy to disassemble and replace
It can be maintained without special tools

Iv. Usage Functions and Purposes
Directional control: Alter the flow direction of the hydraulic oil to control the movement direction of the actuating elements (cylinders, motors)
Flow distribution: Distribute hydraulic oil to different actuating components to achieve complex action coordination
System unloading: In the neutral position, the output oil of the pump can be directly returned to the oil tank, reducing energy consumption
Safety protection: It can be used in conjunction with other valve types to achieve safety functions such as overload protection and sequential action

V. Applicable Machines and Scenarios
Typical equipment in application fields
Construction machinery: excavators, loaders, cranes, rollers, concrete pump trucks
Metallurgical equipment: steel rolling mills, continuous casting equipment, blast furnace charging systems
Mining machinery: shield machines, mine hoists, crushers
Control of the template movement and ejection mechanism of injection molding machines
Marine machinery, deck machinery, steering gear systems, anchor winches
Industrial automation machine tool worktable movement, fixture control, production line equipment
Hydraulic suspension systems for agricultural machinery tractors and combine harvesters
Particularly suitable for: Heavy-duty hydraulic systems that require precise directional control and large flow rates

Six. Similar models
The main differences of the model and the applicable scenarios
DG3V-8-*A spring offset type (single electromagnet), returns to the A position when power is off, suitable for simple systems that only require unidirectional control
DG3V-8-*B spring offset type (single electromagnet), when power is off, return to the B position as above, but in the opposite direction
The DG3V-8-*C spring pair is medium-sized (with double electromagnets). It returns to the middle position after power failure and is suitable for systems that require precise position control and safe positioning after power failure
The DG3V-8-*D pressure is suitable for medium-sized systems that rely on pilot pressure to maintain the median position, saving spring space for systems with limited space
DG5V-8-*C features a larger flow rate (700 L/min), higher pressure (350 bar), and a more robust structure, making it an ideal choice for heavy-duty construction machinery and metallurgical equipment
The DG3V-5-*C has a smaller diameter and a flow rate of approximately 160 L/min, making it suitable for small and medium-sized equipment and auxiliary oil circuits in medium and small flow systems

Vii. Precautions for Use
1. Installation requirements
Clean the pipeline: Thoroughly clean and blow the pipeline before installation to prevent impurities from entering the valve and causing it to get stuck
Correct positioning: Install as indicated by the arrow on the nameplate and ensure the oil port is connected correctly
Firmly fixed: Use the specified torque to tighten the installation bolts to prevent loosening due to vibration
Electrical connection
Ensure that the voltage is consistent with the coil specification (within ±10% range)
Good grounding prevents electric leakage accidents
2. Usage Precautions
System pressure: Not exceeding the rated pressure of 350 bar, and the instantaneous peak pressure does not exceed 420 bar
Oil temperature control: Ensure that the system oil temperature is within the range of -20 ℃ to +65℃ to prevent seal aging caused by high temperature
Flow matching: The system flow should not exceed 700 L/min; otherwise, it will affect the control accuracy
Leading pressure
Internal pilot type: The P port must be equipped with a check valve to maintain a pilot pressure of ≥20 bar
External pilot type: The pilot pressure must be ≥5 bar
Back pressure limit: The back pressure at port T shall not exceed 50 bar; otherwise, it will affect the reset of the valve
3. Maintenance and care
Regular inspection
Check if the connection parts are loose
Is the coil overheated?
Is there any leakage?
Cleaning and maintenance
Check the filter element every 500 hours and replace it if necessary
Regularly clean the surface of the valve body to prevent oil accumulation
Long-term disuse
The valve should be placed in the middle position
Cut off the power supply
Add anti-rust oil when necessary
4. Troubleshooting
Valve core jamming
Reasons: Oil contamination, excessively high oil temperature, improper installation
Solution: Clean the system, replace the filter element, and check the installation
Leakage
Reason: Aging of the sealing ring and wear of the valve core
Solution: Replace the sealing parts and inspect the valve core
Slow response
Reasons: Insufficient pilot pressure, high oil viscosity, low coil voltage
Solution: Inspect the pilot system, replace the oil with the appropriate viscosity, and ensure the voltage is normal