Yuken DSG Series Directional Control Hydraulic Valve

Product Overview

Key Advantages

• High Pressure and Flow Capacity: Engineered to withstand operating pressures up to 35 MPa (5080 PSI) with maximum flow rates reaching up to 100 L/min, providing high power density in a CETOP 03 / ISO 4401-03 footprint.
• Low Pressure Drop: Rationalized internal fluid channel design minimizes internal friction, lowering energy consumption and reducing system heat generation.
• High Reliability and Dirt Tolerance: Powerful wet-armature solenoids generate strong magnetic and spring return forces, offering resistance against spool sticking caused by particulate contamination in hydraulic oil.
• Low-Noise Operation: The oil-immersed wet armature dampens spool changeover movement, significantly reducing switching noise and mechanical impact.
• Global Compliance: Features N. American design standard 7090 hardware specifications, compliant with ISO 4400 / CETOP D03 mounting standards for drop-in international replacement.

Technical Specifications

▔▔

Configuration Options

Valve Structure and Control Method

• Valve Type: Direct-acting spool type solenoid directional valve.
• Position & Spring Arrangement: 3-position spring-centered (3C type). Returns to the center neutral position automatically when solenoids are de-energized.
• Actuation Method: Dual wet-armature DC solenoids.

Flow & Interface Specifications

• Nominal Flow Size: ISO 4401-AB-03-4-A, CETOP-3, NFPA-D03.
• Mounting Interface: Sub-plate mounting design. Mounting screws included (10-24 UNC thread under design standard 90/7090).

Electrical & Connection Configuration

• Coil Voltage: D12 (12 V DC Direct Current).
• Connection Type: Plug-in connector type (DIN 43650 / ISO 4400 3-pin plug) with built-in LED indicator light.
• Override Function: Waterproof manual override pin on solenoid tube ends for emergency actuation or mechanical testing without electrical power.

Key Materials and Components

▔▔

• Valve Body: High-tensile cast iron (FC250 / ductile iron grade). The precision-honed internal bore provides minimal spool clearance, high pressure endurance, and excellent wear resistance.
• Valve Spool: Alloy steel, heat-treated (carburized and hardened) with precision micro-grinding to ensure ultra-low internal leakage and long service life.
• Solenoid Tube & Core: High-permeability stainless steel and soft magnetic iron core sealed in an oil-filled chamber, protecting internal armature parts from ambient moisture and external corrosion.
• Seals: Standard High-Grade Nitrile Rubber (NBR / Buna-N) static O-rings and dynamic seals, ensuring compatibility with petroleum-based hydraulic oils and water-glycol fluids.
• Coil Enclosure: Glass-filled thermosetting resin / epoxy encapsulation providing thermal protection (Class H insulation) and high moisture/vibration resistance.

Packaging and Transport Protection

▔▔

• Primary Industrial Packaging: Each unit is flushed with rust-preventive oil, sealed in a heavy-duty vapor-corrosion-inhibitor (VCI) anti-moisture plastic bag, and placed inside an individual shock-absorbent cardboard box.
• Protective Fixation: The sub-plate mounting surface is fitted with a rigid protective plastic cover plate to shield the ground face and O-ring ports from impact, dust, and scratch damage during transit.
• Bulk Master Packaging: Individual boxes are packed inside multi-layer corrugated master cartons, reinforced with corner edge protectors and shrink-wrapped on export wooden or plastic pallets.
• Environmental Protection: Desiccant packs are enclosed inside master cartons to guarantee zero condensation during long-distance maritime or air transit.

Applications

Hydraulic Press & Stamping Machinery

• Function: Unloading system pressure and free-floating ram control.
• Application: Used in hydraulic press bypass circuits. When the coil is de-energized, the 3C60 open-center spool connects Port P directly to Port T, allowing the hydraulic pump to unload at low pressure, reducing thermal buildup and energy consumption during hold-dwell cycles.

Mobile Equipment and Agricultural Machinery

• Function: Winch motor float control and double-acting cylinder freewheeling.
• Application: Integrated into 12V DC mobile equipment power units (e.g., mobile cranes, drill rigs). The 3C60 spool connects A and B ports to Tank, allowing hydraulic motors or cylinders to move freely without hydraulic lock when deactivated.

Injection Molding & Die-Casting Machines

• Function: Auxiliary actuator direction selection and motor bypass.
• Application: Manages auxiliary ejector pins, core-pulling units, or feed conveyors where rapid switching and zero back-pressure in the idle position are required to prevent unintended mechanical binding.

Related Models

FAQ

Q1: Can this valve be directly interchanged with ISO 4401-03 / D03 valves from other brands?

Yes. The mounting pattern complies strictly with ISO 4401-AB-03-4-A and NFPA-D03 standards. It can directly replace equivalent models from Rexroth (WE6 series), Vickers (DG4V-3), or Parker (D1VW) provided the spool function (3C60 / open center), coil voltage (12V DC), and electrical connector type match.

Q2: What level of oil filtration is required for reliable operation?

We recommend maintaining an oil cleanliness level of ISO 4406 Class 19/16/13 (or NAS 1638 Class 9) or cleaner. A system return line or pressure line filter with a rating of 10 to 25 microns should be installed to prevent spool stiction.

Q3: What fluid types can be used with this valve?

The standard NBR seal configuration is compatible with mineral-oil based hydraulic fluids (HL, HLP) and synthetic water-glycol fluids. For phosphate ester fluids, special fluoro-rubber (FKM/Viton) seals must be specified (prefix F- before the model code, e.g., F-DSG-01-3C60-D12-7090).

Contact Us

Product Overview

Key Advantages

• High Pressure & High Flow Capacity: Engineered to operate reliably at operating pressures up to 31.5 MPa (315 bar) and handle flow rates up to 100 L/min, maximizing system performance.

  Low Pressure Drop & High Efficiency: Optimized internal flow passages minimize fluid friction, reducing energy loss and heat generation during high-duty continuous operation.

  Superior Solenoid Technology: Equipped with wet-armature type solenoids that ensure smooth, quiet operation, enhanced wear resistance, and long service life due to effective oil-lubricated internal parts.

  Dust & Water Resistance: Built to meet IP65 standard protection, providing high operational stability even in harsh industrial environments with moisture or dust exposure.

  Wide Range of Voltage Options: Supports a full spectrum of AC and DC coil voltages, enabling easy integration with diverse PLC automation and electrical control systems.

  Versatile Spool Configurations: Offers a comprehensive variety of spool types and spring arrangements to suit complex circuit requirements.

Technical Specifications

Applications

Related Models

FAQ

Q1: What does the wet-armature solenoid design in the Yuken DSG series mean, and why is it beneficial?

Answer: In a wet-armature solenoid valve, the solenoid armature core is directly immersed in the hydraulic oil. This eliminates the need for dynamic oil seals on the push pin, which significantly reduces friction and wear. The hydraulic fluid acts as a natural lubricant and shock absorber, resulting in lower operational noise, minimal oil leakage risks, and an extended solenoid service life.

Q2: What is the primary difference between DSG-01 and DSG-03 valve models?

Answer: The primary differences lie in the mounting size, flow capacity, and physical dimensions. DSG-01 conforms to the CETOP 03 (NG6) mounting pattern and handles maximum flow rates around 63 L/min. DSG-03 conforms to the larger CETOP 05 (NG10) pattern and is capable of handling higher flow rates up to 100 L/min.

Contact Us