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DG4V
EATON
Solenoid operated directional control valves are for directing and stopping flow at any point in a hydraulic system.
Efficient control of greater hydraulic powers without increasing solenoid power consumption.
Installed cost and space savings from higher power/weight-and-size ratios.
Installation flexibilitly resulting from choice of numerous combinations of solenoid connectors and locations
Viton seals as standard for multi-fluid capability, Nitrile seals available as a model code option.
Higher sustained machine productivity and higher uptime because of proven fatigue life and endurance, tested over 20 milion cycles
Solenoid coils can be chanaed quickly and easily without leakage from hydraulic system.
DG4V3-S/R- High Performance and Standard Performance Valves
Minimum pressure drop 2.5 bar at 30 l/min.
Range of coil connectors including DlN, Deutsch. AMP and terminal box.
Range of coil voltages and power options.. Up to 80 Wmin (21 USgpm) and up to 40 lmin (10.5 USgpm) respectively at 350 bar (5000 psi).
Offers desianers the opportunity to select the ootimum yalue package for each application.
intemational standard inteface. The valve mouning face conforms to is0 4401, size 03 and is comatble with related inteational standards
1. DG4V-3-2C-M-U-H7-60 (NG6, two-way two-port)
Applicable scenarios:
Simple start-stop control (such as one-way movement of hydraulic cylinders).
Example: Safety door of a press machine needs to be locked and requires a quick response (action time < 50ms). Advantages:
Compact structure, low cost, suitable for infrequent operations.
2. DG4V-5-6CJ-M-U-H6-20 (NG10, three-position four-way)
Complex hydraulic motor control (such as the slewing mechanism of an excavator).
Example: Hydraulic system with neutral position disengagement (P type) to reduce energy loss.
Large flow design, supporting high-pressure conditions, enhancing control accuracy with hydraulic positioning function.
Parameter DG4V-3-2C DG4V-5-6CJ
Recommended power supply type AC 110V (60Hz) DC 24V (industrial standard)
Maximum switching frequency 120 times/minute 60 times/minute
Internal leakage ≤0.1mL/min ≤0.5mL/min
Recommended filtration accuracy NAS 7 grade NAS 6 grade
Typical application pressure ≤250bar ≤315bar
Flow direction indication: The arrow on the valve body should be consistent with the oil flow direction to avoid reverse installation causing pressure shock.
Electrical connection: Confirm that the coil voltage matches the power supply (e.g., AC 110V needs to be connected to a 50/60Hz power supply).
Pollution control: The system filtration accuracy should reach the recommended level and filter elements should be replaced regularly (suggested to check every 500 hours).
Regularly check the valve seat sealing of the two-position two-way valve to prevent internal leakage.
Lubricate the manual operation lever (suggested to lubricate once every 6 months).
Pay attention to whether the neutral function meets the system requirements (e.g., P type needs to confirm if it is necessary to disengage).
Ensure the cleanliness of the hydraulic fluid for the hydraulic positioning function to avoid jamming.
Common problems and solutions
Fault phenomenon DG4V-3-2C Possible causes DG4V-5-6CJ Possible causes
Valve core does not move Circuit break, insufficient voltage, valve core stuck Same as above, or insufficient hydraulic positioning pressure
Excessive leakage Sealing components aging, valve body scratch Same as above, or failure of neutral function seal
Three-position switching sluggish Not applicable (two-position valve) Electromagnet suction force insufficient, spring fatigue
Electromagnet overheating Continuous operation, poor heat dissipation Same as above, or voltage fluctuation causing frequent start-stop
Proportional control: Upgrade to DG4V-3-2C-P to achieve linear flow regulation.
Explosion-proof requirement: Select DG4V-3-2C-EX (Ex d IIC T6 certification).
High-frequency response: Replace with DG5V-5-6CJ (NG10, response time < 50ms).
Bus control: Integrate CANopen interface for digital monitoring.
| Place of Origin | Germany |
| Brand Name | Vickers |
| Model Number | DG4V-3S-0C-M-U-H5-60 |
| SEAL TYPE | (0) VITON |
| VALVE TYPE | (DG4V) SOL. OPERATED SUB PLATE MOUNTED DCV, 350 BAR AT PORTS A, B & P |
| INTERFACE | (3) ISO/DIN 4401-AB-03, SIZE 3 INTERFACE |
| PERFORMANCE | (0) HIGH PERFORMANCE |
| SPOOL TYPE | (6) P BLOCKED, A & B TO T |
| SPRING ARRANGEMENT | (C) SPRING CENTERED. DOUBLE END. |
| BUILD ORIENTATION | (0) STANDARD BUILD |
| MANUAL OVERRIDE | (0) PLAIN OVERRIDE IN SOLENOID ENDS ONLY |
| DIODE | (0) NO DIODE |
| COIL VOLTAGE | (H) 24V DC 30 WATT |
A1: This is a low-speed high-torque hydraulic motor. Its core lies in the "five-star" cam track inside and the radial arrangement of the piston-roller units. High-pressure oil pushes the piston, and the rollers roll along the internal curve track, generating tangential force to drive the shaft to rotate. The main advantage is that it has extremely high torque, runs extremely smoothly at low speeds, has high startup efficiency, and is particularly suitable for direct drive of heavy-load equipment, without the need for a gearbox.
A2: The main differences lie in the structure, torque, and rotational speed characteristics:
• Structure: It is a radial piston type, with the pistons arranged perpendicularly to the axis; the pistons of the axial piston motor are parallel to the axis.
• Torque and Speed: It has the maximum torque in the same volume, but the lowest speed. It is a typical low-speed high-torque motor. Axial piston motors have a higher speed and medium torque; gear motors have a high speed but low torque, and they are also low in cost.
• Application: It is used to directly drive heavy-duty low-speed rotating mechanisms (such as wheels, drums). Axial piston motors are commonly used in closed circuits that require high rotational speed and variable speed (such as the drive for walking machinery). Gear motors are used in light-load and high-speed applications.
• Variable speed: The rotational speed can be adjusted by changing the flow rate of the input motor. The greater the flow rate, the higher the rotational speed.
• Directional change: This is achieved by altering the flow direction of the hydraulic oil, allowing for the transition from forward rotation to reverse rotation.
• Variable model: Yes, for some models, the effective number of plungers or the number of internal curve operations can be changed by using a servo variable mechanism, thereby achieving stepless or step-variable functions. This enables an expanded speed regulation range or adaptation to different working conditions.
A4: The core of selection is to match the load torque and the required speed.
1. Calculate the required torque: Determine the maximum working torque (unit: Nm) needed for the drive based on the load resistance, transmission radius, etc.
2. Determine the system working pressure: The maximum stable working pressure that your hydraulic system can provide (unit: bar).
3. Calculate the theoretical displacement: Estimate using the formula: Required displacement (L/r) ≈ (Required torque Nm × 62.8) / System pressure bar. Based on the calculation results, select the closest, slightly larger standard displacement specification.
4. Verify the speed: Calculate the maximum speed (rpm) based on the maximum flow provided by the system and the selected displacement. Ensure that it is within the allowable speed range of the motor.
A5:
• Pressure Rating: Ensure that the rated pressure and peak pressure of the motor are higher than the maximum working pressure of the system.
• Installation and connection method:
Installation method: Flange installation, hub installation or shell rotation type?
Shaft extension type: spline (specification), flat key or involute spline?
Oil port connection: Is it using threads (such as G threads, NPT) or SAE flanges?
• Auxiliary Function: Is it necessary to integrate a normally-closed multi-disc brake (for parking brake)? Is it necessary to install a speed sensor (for speed feedback)?
• Rotation direction: The standard direction is usually specified. If a specific rotation is required, it must be clearly stated during the order placement.
• Oil cleanliness: The standard is extremely high. The cleanliness of the system oil must be at least at the NAS 1638 8 grade or ISO 4406 19/17/14 grade to protect the precise metering and plunger assemblies.
• Return oil back pressure: A certain back pressure (typically 0.5 - 1.5 MPa) needs to be maintained on the return oil path of the motor to prevent "loose contact" shock and noise when the rollers detach from the inner curve track. However, the back pressure must not exceed the maximum value specified in the sample.
• Oil discharge pipeline: A separate oil discharge pipe (the oil return pipe from the housing) must be set up, directly leading the oil back to the oil tank, and the back pressure of the oil discharge must be lower than 0.05 MPa.
A7: Alignment, oil drainage, and initial lubrication are crucial.
1. Strict alignment: The output shaft of the motor and the load shaft must be connected using an elastic coupling, and the coaxiality error must be kept as small as possible (typically required <0.1mm). Poor alignment can lead to abnormal wear of bearings and leakage of the shaft seal.
2. Independent oil drainage: The oil drain port must be connected back to the oil tank with a sufficiently large pipe in a separate, direct, and unobstructed manner. No filters or throttling valves should be installed in the middle of the pipeline.
3. Initial oiling: Before starting, the motor housing must be filled with clean hydraulic oil through the oil drain port or a dedicated oiling port to ensure that the internal bearings and moving parts receive initial lubrication.
1. No-load running-in: After the connection is correct, start the motor at extremely low pressure (such as 1-2 MPa) and at a low speed, allowing it to run forward and backward for several minutes to expel the air from the pipeline and the motor interior.
2. Gradual loading: Slowly increase the system pressure and flow rate, operate for a period of time in stages (such as 25%, 50%, 75% of the rated pressure), and perform running-in.
3. Check operating status: Throughout the process, listen for any abnormal noises or vibrations, check for leaks at all connections, and monitor whether the shell temperature is within the normal range (typically the temperature rise does not exceed 50°C).
4. Function testing: Test whether the motor's start, stop, direction change, speed change (if adjustable) and brake release and braking functions are normal.
• Oil type: It is recommended to use high-quality anti-wear hydraulic oil with a viscosity index (VI) above 90 (such as HM or HV type). The commonly used viscosity grades are VG46 or VG68, depending on the ambient temperature and working pressure.
• Oil temperature range: The optimal operating oil temperature is 40°C to 60°C. The allowable continuous working temperature range is generally -20°C to +80°C. If the oil temperature is too low, it will cause difficulties in starting. If it is too high, it will accelerate the aging of the oil and reduce efficiency.
• Daily inspection: Every shift, check the oil level, oil temperature, for any abnormal noises or vibrations, as well as for any leaks at the shaft seals and interface areas.
• Regular inspection and replacement:
Oil and filter: Depending on the working environment, it is usually recommended to inspect the oil quality every 1,000 - 2,000 hours or at least once every six months, and replace the hydraulic oil and all filters.
Fasteners: Regularly inspect and tighten all installed bolts and pipe joints.
Performance monitoring: Regularly measure the rotational speed and torque of the motor under the rated operating conditions to determine if there is a decrease in performance, and check if the leakage volume has increased, in order to assess the performance status of the motor.
1. Cavitation or oil suction failure: Poor oil suction in the system, clogged filter, or low oil level, resulting in air mixed into the oil. Check the oil suction pipeline and the oil level in the oil tank.
2. Insufficient return oil back pressure: Low back pressure in the return oil path causes the rollers to lose contact with the inner curved track at a specific position, resulting in impact. Check and appropriately increase the back pressure of the return oil (within the allowable range).
3. Internal wear or damage: Wear or damage to the bearings, rollers, or inner curved track. Disassembly and inspection are required.
4. Poor alignment during installation: Re-align the installation.
1. System oil supply issue: Check if the main pump is providing sufficient pressure and flow; check if the main valve and relief valve are set correctly or if there is leakage.
2. Excessive internal leakage in the motor: The flow distribution subassembly or the plunger subassembly has excessive wear, resulting in a larger gap and a decrease in volumetric efficiency. It is necessary to measure the volumetric efficiency of the motor (the difference in rotational speed under no-load and load conditions).
3. Brake not fully released: If a brake is equipped, check if the control oil pressure is sufficient and ensure that the brake is fully opened.
4. Excessive load or mechanical jamming: Check if the load end is jammed by foreign objects or if the bearings are damaged.
A13: The most common cause is excessive back pressure during oil discharge. It is essential to ensure that the oil discharge pipe is separate, direct, and unobstructed, and that the pipeline is free from bends and blockages. If the back pressure exceeds the allowable value (typically 0.05 MPa), the high-pressure oil will force the oil seal to leak. Secondly, it could be that the oil seal is aging or the surface of the shaft is worn.
