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DSG-03 Series
YUKEN
The DSG-03 series of hydraulic electromagnetic directional control valves is a direct-acting type driven by wet-type electromagnets, specifically designed to meet the reliable directional control requirements in high-pressure and high-flow industrial hydraulic systems. This series of valves directly actuates the spool through the thrust generated by the energized electromagnet, changing the connection state of the hydraulic oil circuit, thereby precisely controlling the movement direction, start and stop of the actuating elements such as hydraulic cylinders or hydraulic motors. With its optimized flow path design, powerful electromagnets and compact structure, the DSG-03 series has been widely applied in various industrial fields including construction machinery, injection molding, metallurgical equipment, and presses.
The core of the DSG-03 series electromagnetic directional control valve is a spool valve structure. Inside the valve body, there is a precise valve core that can slide axially within the valve sleeve. The valve body usually has four main oil ports: pressure oil port (P), tank return port (T), and two working oil ports (A and B).
• Normal state (electromagnet de-energized): The valve core is held in the preset "neutral" or initial position by the reset spring. At this time, the oil ports form specific on-off relationships according to the "neutral function" of the valve (such as O-type, H-type, Y-type, etc.), and the actuator is in a stopped or specific state.
• Directional change (electromagnet energized): When the coil of the electromagnet on one side is energized, the electromagnetic force generated pushes the spool through the push rod to overcome the spring force and move to another working position. The connection relationship of the oil circuit changes accordingly. The pressure oil flows from the P port to the A port or the B port, driving the actuator to act, while the oil from the other working port flows back to the tank through the T port.
Advantages of wet electromagnetic iron: The armature and push rod of its electromagnetic iron work completely submerged in hydraulic oil. This design not only has excellent heat dissipation performance and low working noise, but also significantly improves the reliability and service life of the electromagnetic iron due to the lubrication and damping effect of the oil.
By adopting a high-thrust wet electromagnetic iron and a high-strength return spring, along with an optimized 5-chamber valve body flow channel design, it achieves an outstanding performance of stably passing a maximum flow rate of 120L/min under a system pressure as high as 31.5MPa (approximately 315bar). The working pressure of some new models can even be increased to 35MPa.
The reasonable internal flow channel effectively reduces the pressure loss (pressure drop) when the oil passes through, which can be reduced by about 10% compared to the previous generation of products, contributing to improving the energy efficiency of the entire hydraulic system.
Strong anti-pollution ability: The powerful electromagnetic iron and spring design ensure that the valve core can still operate reliably and prevent jamming even when the oil contains a certain amount of contaminants.
Outstanding protection performance: The electromagnet part complies with IP65 protection grade, effectively preventing dust from entering and water splashes from any direction, making it suitable for harsh industrial environments. Some models can also be equipped with IP67 plugs for even higher protection levels.
Wide temperature range operation: The standard model can operate stably within a medium temperature range of -20℃ to +80℃, and there are specially sealed models available to adapt to higher or lower temperature environments.
Diverse valve core functions: Offer various types such as two-position four-way (2B2), three-position four-way (3C2, 3C3, 3C4, 3C6, etc.), meeting the requirements of different hydraulic circuits like pressure holding, unloading, differential, and floating.
Complete voltage specifications: Supports multiple voltage specifications including DC (DC12V, DC24V) and AC (AC110V, AC220V, AC240V), and can provide AC/DC universal (RQ type) coils to adapt to different power supply scenarios.
Flexible installation and interface: Mainly adopts plate installation in compliance with ISO 4401 standard, with stable connection and easy integration. Meanwhile, it offers a variety of wiring methods, including junction box type, DIN connector type, M12 plug type and Deutsch plug type with better waterproof performance, facilitating on-site wiring.
In addition to the standard model, a shockless type (S-DSG-03) is also available. Through a special design, it effectively suppresses the noise and pipe vibration generated when the valve core changes direction, making it suitable for applications with high noise control requirements.
The following are the typical technical parameters of the DSG-03 series universal electromagnetic directional control valve. The specific values may vary slightly depending on the specific model and manufacturer.
| Parameter Item | Unit | Parameter Value | Remarks |
| nominal diameter | mm | 10 (corresponding to NG6) | interface size of the valve |
| Maximum working pressure | MPa (bar) | 31.5 (315) | Some models can reach 35 MPa. |
| Maximum allowable back pressure (T port) | MPa (bar) | 16 (160) | Return oil line pressure limit |
| Rated flow | L/min | 63 - 120 | depending on the specific model and pressure difference. |
| Maximum switching frequency | times/minute | 240 (standard type) / 120 (R-type electromagnet) | |
| Coil voltage | V | DC12, DC24, AC100, AC110, AC200, AC220, AC240, etc. | |
| coil power | W | approximately 15W (DC) and approximately 20VA (AC) | typical values |
| Working medium | Mineral hydraulic oil (ISO VG32, VG46, etc.), water glycol, phosphate ester oil (special type) | ||
| Medium temperature range | °C | -20 ~ +80 (standard type) | Low-temperature (-40°C) and high-temperature (+120°C) models are available. |
| Protection class | IP65 (for the electromagnet part) | Dustproof and protected against water jets | |
| Valve body material | Ductile iron | ||
| surface hardness of the valve core | HRC | ≥ 60 | high-hardness wear-resistant treatment |
DSG: Series code, referring to the electromagnetic directional control valve.
• 03: Specification code, representing the bore size (03 bore).
• 3C4: Valve core function and position number code. "3" represents three positions, "C" represents four-way, and "4" represents a specific neutral function (such as H-type, where ports P, A, B, and T are all connected, and the system is unloaded).
• D24: Electromagnet specification. "D" stands for DC electromagnet, and "24" represents the rated voltage of 24V DC.
• N1: Installation and interface form. "N1" typically represents a certain type of panel mounting interface standard.
50: Design serial number or special option code.
The DSG-03 series high-pressure and high-flow solenoid valves are suitable for various industrial hydraulic systems that require reliable directional control:
• Construction machinery: Hydraulic control of boom, stick, and rotation mechanisms in excavators, loaders, cranes, and other equipment.
• Plastic machinery: Control of actions such as mold closing, injection ram movement, and ejection in injection molding machines.
Machine tool equipment: Direction control of the oil cylinders for hydraulic presses, bending machines, and shearing machines.
• Metallurgical equipment: auxiliary hydraulic devices for continuous casting machines and steel rolling equipment.
Other industrial automation fields: production lines, test benches, deck machinery on ships, etc.
To select the appropriate DSG-03 model for your system, please follow these steps:
Working pressure: The maximum working pressure of the system must be less than or equal to the rated pressure of the valve (31.5 MPa or higher).
Flow demand: Select the rated flow of the valve based on the maximum flow of the system, usually with a margin of 10% to 15%.
Choose the neutral position function (such as O-type pressure holding, H-type unloading, Y-type cylinder floating, etc.) and the number of positions (two-position or three-position) according to the design requirements of the hydraulic circuit.
Voltage: Select DC (direct current) or AC (alternating current) and the corresponding voltage level based on the on-site power supply.
Protection and explosion-proof: In damp and dusty environments, choose IP65 or higher protection ratings; in flammable and explosive environments, select explosion-proof (EX) models.
Determine whether it is a plate connection (N1/N2) or a tube connection (L1/L2), and verify the installation surface dimensions and oil port thread specifications.
If the medium is a special hydraulic oil such as phosphate ester, or if the ambient temperature exceeds the standard range, a corresponding special model should be selected.
Before installation: Thoroughly clean the installation surface of the valve and the system pipelines to ensure there are no impurities or burrs. It is recommended that the oil cleanliness reaches NAS 9 or higher, and install a filter with a precision of no less than 10 μm before the valve.
During installation: Tighten the installation bolts evenly in a diagonal sequence in several steps. The torque must comply with the specified requirements to prevent valve body deformation that could cause the valve core to jam.
Wiring: Be sure to check the coil nameplate voltage and connect the power supply correctly. For DC electromagnets, pay attention to the polarity. Ensure the wiring is secure to prevent loosening due to vibration.
The valve must not be used beyond its rated pressure, flow rate and voltage.
Note that the back pressure of the return oil at the T port must not exceed the allowable value (usually < 1.6 MPa). Excessive back pressure will affect the reversing and resetting.
The models with manual push rods are only for debugging or emergency use. It is strictly prohibited to operate the manual mechanism when the power is on.
Regularly check the temperature rise of the electromagnet, whether there is external leakage from the valve body, and whether the operation is normal.
If there is sluggish reversing, incomplete reversing or abnormal noise, the first step should be to check the cleanliness of the oil and whether the electromagnet is in good condition.
Disassembly and maintenance must be carried out after the power supply is cut off and the system pressure is completely released, and the operation should be performed in a clean environment.
| Fault Phenomenon | Possible Causes | Solutions |
| valve does not change direction | 1. The electromagnet is not powered or the coil is burned out. 2. The voltage is too low. 3. The valve core is stuck by contaminants. 4. The reset spring is broken. | 1. Check the circuit and fuse, and measure the coil resistance. 2. Check the power supply voltage. 3. Disassemble and clean the valve core and valve body. 4. Replace the spring. |
| Slow reversing action | 1. Insufficient electromagnetic force (low voltage). 2. Excessively high oil viscosity or too low temperature. 3. Slight wear on the spool or valve body. | 1. Adjust the voltage to the rated value. 2. Heat the oil or replace it with a suitable viscosity grade. 3. Inspect and replace worn parts. |
| Excessive internal leakage | 1. The fit clearance between the valve core and the valve body has increased due to wear. 2. The sealing ring is damaged. | 1. Replace the valve core or the valve body assembly. 2. Replace the sealing parts. |
| External leakage: | 1. The sealing ring on the installation surface is damaged or the clamping force is uneven. 2. The seal at the solenoid push rod is damaged. | 1. Replace the sealing ring and evenly tighten the bolts. 2. Replace the solenoid assembly or the seal. |
| Abnormal noise | 1. There is foreign matter on the contact surface of the electromagnet. 2. The voltage is too high, causing a large impact on the electromagnet. 3. System pressure fluctuates or there is air in the system. | 1. Clean the electromagnet. 2. Adjust the voltage. 3. Remove air from the system and check the pressure stabilizing device. |
The DSG-03 series of electromagnetic directional control valves are designed and manufactured in strict accordance with industrial standards. Before leaving the factory, each product undergoes rigorous pressure resistance tests, leakage tests and action performance tests to ensure its reliability. The manufacturer can provide products that meet specific industry standards (such as CE, ATEX explosion-proof certification, etc.) according to customer requirements. For specific model parameters, performance curves and certification information, it is recommended to consult the latest product samples or technical data released officially.
A1: The DSG-03 is a direct-acting, wet-type solenoid-driven hydraulic directional control valve. Its core component is a precisely machined spool that can slide within the valve body. When the solenoid is de-energized, the spool remains in the neutral position (initial position) under the action of a return spring. When one side of the solenoid is energized, the electromagnetic force directly pushes the spool to move, thereby changing the connection between the pressure oil port (P), the return oil port (T), and the two working oil ports (A, B), precisely controlling the movement direction of hydraulic actuators such as cylinders and motors. The "wet-type" design means that the solenoid is filled with hydraulic oil, offering advantages such as good heat dissipation, low noise, and long service life.
A2: The DSG-03 series is designed to meet the demanding requirements of industrial applications. Its typical parameters are: the maximum working pressure can reach up to 31.5 MPa (approximately 315 bar), and some models can reach 35 MPa; the rated flow range is between 63 and 120 L/min. This makes it highly suitable for use in construction machinery (excavators, cranes), plastic machinery (injection molding machines), metallurgical equipment, heavy-duty presses, machine tools, and other industrial automation systems that require reliable control of high-pressure and large-flow oil circuits.
A3: Model selection is crucial for ensuring system compatibility. Please focus on the following points:
1. System pressure and flow: Ensure that the valve's maximum working pressure and rated flow fully cover your system's maximum requirements, and it is recommended to leave an appropriate margin.
2. Valve core function: Select based on the hydraulic circuit function. For example, the "O-type" neutral function (3C2) is used for pressure holding of the actuator; the "H-type" neutral function (3C4) unloads the system; the "Y-type" function (3C3) connects both chambers of the cylinder to the tank, allowing it to float.
3. Electrical specifications: Choose the voltage (such as DC24V or AC220V) and coil type based on the on-site power supply. In harsh environments (dusty, humid), confirm the protection level of the electromagnetic part (standard is IP65).
4. Installation and interface: Confirm whether it is a plate-mounted installation (conforming to ISO 4401 standard) or another method, and check the oil port thread specifications.
5. Medium and ambient temperature: Confirm that the valve's sealing material is compatible with the hydraulic oil you use (mineral oil, water-glycol, etc.) and ensure that the operating temperature is within the valve's allowable range (standard type is -20°C to +80°C).
A4: This is a typical model code, and the meanings of each part are as follows:
• DSG: Series code for electromagnetic directional control valve.
• 03: Through-bore size code (corresponding to the NG6 interface).
• 3C4: Valve spool function code. "3" indicates three positions, "C" indicates four-way, and "4" represents a specific neutral function (usually H-type, with P, A, B, and T ports all open, and the system unloaded).
• D24: Electromagnet specification. "D" stands for direct current and "24" represents 24V voltage.
• N1: Installation and interface form code (typically referring to a certain type of panel mounting standard).
50: Design sequence or special option code.
A5: Correct installation is the prerequisite for reliable operation:
• Cleanliness: The installation surface, joints and pipelines of the valve must be thoroughly cleaned before installation to ensure there are no impurities or burrs. It is recommended that the system oil cleanliness reaches NAS 9 or higher.
• Tightening: Install the bolts in a diagonal sequence, tightening them evenly in several steps. The torque must comply with the specified requirements to prevent valve body deformation that could cause the valve core to jam.
• Return oil back pressure: It is essential to ensure that the back pressure at the return oil port (T port) does not exceed the allowable value (typically 1.6 MPa). Excessive back pressure can affect the normal shifting and resetting of the valve core.
Wiring: Check the coil voltage and connect it correctly. For DC electromagnets, pay attention to the polarity.
A6: This is a common fault. Possible causes and troubleshooting steps are as follows:
1. Electrical issue: First, check if the solenoid is energized, measure the coil resistance to determine if it is burned out, and confirm if the power supply voltage reaches the rated value (low voltage can lead to insufficient electromagnetic thrust).
2. Oil problem: Check if the oil viscosity is too high (especially during low-temperature startup) or if it is severely contaminated. Contaminants can cause the valve core to stick. Check if the oil temperature is normal.
3. Mechanical issue: The valve core or valve body may be worn, causing sticking or increased internal leakage. The reset spring may also be fatigued or broken.
4. System issue: Check if the return oil back pressure is too high or if the system pressure fluctuates too much.
A7: Preventive maintenance is crucial:
• Keep the oil clean: Regularly check the oil contamination level and replace the filter element in a timely manner. This is the most effective measure to ensure the valve's lifespan.
Regular inspection: Listen for any abnormal noises during operation, feel if the temperature rise of the electromagnet is too high (if it's too hot to touch, it's abnormal), and observe if there is any external leakage at the valve body and interface.
Correct operation: It is strictly prohibited to use the valve beyond its rated parameters. Models with manual push rods are only for debugging or emergency use. Do not operate them when powered on.
Long-term shutdown: If the equipment is not used for a long time, it is recommended to take anti-rust measures and periodically operate the valve briefly to prevent the sealing parts from sticking together.
A8: The main difference lies in the dynamic characteristics during reversing:
• Standard type: Fast reversing speed and quick response.
• Non-impact type (S type): Through special design (such as optimizing the throttle slot of the valve core), the switching speed is slowed down, effectively reducing the pressure shock, noise and pipeline vibration generated at the moment of switching.
How to choose: If your system has high requirements for noise control, or if the pipeline is long and prone to water hammer, it is recommended to choose the non-impact type. It provides better protection for system components and pipelines, but the reversing time will increase slightly.
A9: Yes, but you must choose the corresponding special model. The sealing materials of the standard DSG-03 valve are usually designed for mineral hydraulic oil. For difficult-to-burn hydraulic oils such as water glycol (HFC) or phosphate ester (HFD), the sealing materials (such as butyl rubber, fluorine rubber, etc.) and certain metal surface treatments need to be specially adapted to resist the corrosion and swelling of the medium. When selecting the model, be sure to clearly inform the supplier of the medium type.
A10: It is recommended to seek support through the following channels:
1. Official channels: Contact the authorized dealers or manufacturers of the product to obtain the latest product samples, technical manuals and CAD drawings.
2. Spare parts: When repairing, it is recommended to use original or equivalent quality seal kits and solenoid assemblies to ensure performance. Providing the complete model nameplate information on the valve is crucial for accurate spare part ordering.
3. Technical support: For complex system failures or selection questions, providing detailed system schematics, operating conditions and failure symptoms will help technicians give more accurate diagnoses and suggestions.
