DG4V Solenoid Operated Directional Valve DG4V-3-2C-M-U-D6-60 DG4V-5-2C-MU-C6-20 DG4V-3-6C-M-U-D6-60

Analysis of Model DG4V-3-2C-M-U-D6-60
This is a clearly structured model code, with each part representing a specific feature of the valve. We break it down into: DG4V-3-2C-M-U-D6-60DG4V: Series code. Refers to the 4 series, electromagnetic operation, hydraulic directional control valves of Vickers (now part of Parker Hannifin).

3: Valve port size. The dimensions of the main oil ports (P, T, A, B) of the valve comply with the NG06 (CETOP 5) standard. This is the interface size and does not represent the flow rate.

2C: Slide valve function. This is one of the most crucial features, referring to the connection mode of each oil port when the valve core is in the neutral position.

2C: It represents the “O” type median function. At the median position, all oil ports of P, A, B, and T are fully closed, and the actuator (cylinder or motor) is locked in its current position.

M: Type of electromagnet.

M: Stands for wet plug, DC electromagnet.

S: Stands for dry plug, AC electromagnet.

U: Voltage and electrical connection form.

U: Usually represents 24VDC, with dual lights, dual magnetic rings, and a plug-in junction box (ISO 4400 standard).

D6: Operation mode. It refers to how to drive the valve core to change direction.

D6: Represents double electromagnets, driven by power supply on one side, with spring alignment. That is, the valve has two electromagnets. When the left side is energized, the valve switches to the right position. When both ends are de-energized, the spring force brings the valve core back to the middle position.

60: Design version/serial number. Used internally by the manufacturer, it may represent a specific sealing material, process improvement or production batch.

Summary: The DG4V-3-2C-M-U-D6-60 is an NG06 interface electromagnetic directional control valve, featuring an O-type neutral function, a 24V DC wet electromagnet, a plug-in junction box, and dual electrically controlled spring alignment.

2. Product attributes
Type: Hydraulic electromagnetic directional control valve (directional control valve).

Operation mode: Electromagnet drive, hydraulic assistance/spring return.

Installation method: Plate installation in compliance with ISO 4401 standard (sub-plate installation or base plate installation).

Maximum working pressure: Usually 350 bar (approximately 35 MPa).

Maximum flow rate: It depends on the valve core function and pressure drop. For the NG06 specification, the typical value is approximately 40-60 L/min.

3. Characteristics
High performance: Allows for high working pressure and flow rate, with a fast response speed.

Long service life: It adopts a wet electromagnet, with the coil immersed in oil, ensuring good heat dissipation and an extremely long working life.

Strong versatility: Complies with international standards (ISO 4401), with uniform installation dimensions, and is easy to replace and integrate.

Easy maintenance: The electromagnet and the valve body can be separated, and the electromagnet and the junction box can be replaced as a whole without disassembling the oil pipe.

Multiple options: Offer a rich selection of valve core functions, voltages, electrical interfaces and control methods.

Low impact: The valve core is equipped with a damping design, ensuring smooth reversing and reducing hydraulic shock.

4. Working Principle
Structure: It is mainly composed of a valve body, a movable valve core, a reset spring and an electromagnet.

Neutral state (power-off) : Under the “O” type function, the valve core is in the neutral position under the action of the springs at both ends, and all oil ports are closed.

Reversing process: When the electromagnet on the left is energized, the electromagnetic force it generates pushes the valve core to move to the right, compressing the spring on the right. This changes the connection relationship of the oil circuit, for example: Port P is connected to Port A, and Port B is connected to Port T.

Hold and reset: For spring pairs (such as D6), the electromagnet must be continuously energized to maintain the position of the valve core. Once the power is cut off, the spring force will immediately push the valve core back to the center position.

The function of hydraulic oil: The oil not only transmits power but also lubricates the valve core and cools the electromagnet (wet type).

5. Function and Role
The core function in the hydraulic system is “directional control” :

Control the direction of the fluid flow: Change the direction in which the pressure oil (P port) enters the actuator (A port or B port), thereby controlling the extension/retraction of the cylinder or the forward/reverse rotation of the hydraulic motor.

Start, stop and hold: The movement of the actuator can be started or stopped by switching the valve position. At the median, the actuator is locked in a certain position through a specific function (such as an O-type).

Unloading: Some intermediate functions (such as H-type and M-type) can make the oil output by the pump flow directly back to the oil tank, achieving system unloading and saving energy.

6. Usage scenarios
The DG4V valve is widely used in industrial fields that require reliable and rapid directional control

Plastic injection molding machine: Control actions such as mold closing, injection platform movement, and ejection.

Metal processing machinery: cylinder reversing for presses, bending machines, and shearing machines.

Machine tool industry: Control spindle clamping/releasing, tool changing mechanism, and worktable movement.

Construction machinery: Control of certain auxiliary actions, such as the thumb pliers of excavators and the start and stop of breakers.

Papermaking machinery, textile machinery: Sequential control of various actuators.

7. Installation and Usage precautions
Oil cleanliness: Of vital importance! It is recommended that the cleanliness of the system oil reach NAS level 7 or higher. Contamination is the main cause of valve core jamming and wear.

Installation plate: Installation sub-plates or base plates that comply with the ISO 4401 standard must be used, and the flatness of the installation surface must meet the requirements.

Tightening torque: When installing the fixing bolts of the valve, a torque wrench must be used to cross-tighten according to the torque value recommended by the manufacturer (usually 20-30 N.m). Over-tightening may cause deformation of the valve body and jamming of the valve core.

Oil drain port: If the valve is equipped with an external oil drain port (such as L port), it must be connected back to the oil tank with a separate oil pipe without back pressure. If it is blocked or the back pressure is too high, it will cause the valve to fail to work properly or be damaged.

Electrical connection

Confirm that the voltage (such as 24V DC) is exactly the same as that marked on the electromagnet.

The wiring should be firm to prevent loosening and sparking.

For plug-in junction boxes with indicator lights, make sure to align the slots properly during installation.

Manual operation: Most DG4V valves are equipped with manual push rods for forced reversing during commissioning. Do not use the manual push rod when it is powered on.

Storage: When stored for a long time, the valve port should be sealed with a plastic cover and kept in a dry and clean environment.

8. List of DG4V series models
The DG4V series model combination is very rich. Here are some common variant examples:

DG4V-3-0-2C-M-U-D5-60

0: No external pilot fuel supply port.

D5: Single electromagnet operation, spring offset (one end electromagnet, the other end spring).

DG4V-5-6C-20-M-U-H7-60

5: NG10 (CETOP 7) valve port size.

6C: “H” type median function (all P, A, B, and T are connected, the pump is unloaded, and the actuator floats).

20: Equipped with an external pilot oil supply and oil drain port.

H7: Hydraulic control, spring centering (used as a pilot valve or small-bore main valve).

DG4V-3-2A-S-2-D6-60

2A: “Y” type median function (ports A and B are connected to port T, while port P is closed).

S: AC electromagnet.

2:110V AC, with non-plug-in junction box.

DG4V-3-8C-M-U-D6-60

8C: “P” type median function (P port is simultaneously connected to A and B ports, T port is closed, used for differential circuits).

DG4V – 3 – 2A – M – U – H7 – 60
DG4V – 3 – 2C – M – FW – B6 – 60
DG4V – 3 – 22A – M – U – H7 – 60
DG4V – 5 – 2C – M – U – H5 – 20
DG4V – 3S – 6C – M – U – G5 – 60
DG4V – 3 – 2A – Z – M – U – A6 – 60
DG4V – 3 – 6C – H – M – U – D6 – 60
DG4V – 3 – 2C – VM – U – B6 – 60