DG4M4-32A Vickers Miniature Solenoid Valve 21 MPa Compact

Product Overview

The DG4M4 series miniature solenoid directional valve (including models DG4M4-32A-200AC-20-JA, DG4M4-32C, DG4M4-36C, DG4M4-30C, and DG4M4-32B) is manufactured to original Eaton Vickers / TOKIMEC technical standards. Belonging to the DG4M4 series with size 02 (ISO/DIS 4401-02-02 mounting pattern), this valve is an ultra-compact subplate mounting solenoid directional valve. Featuring a wet armature design with resin-molded coils, the valve offers a maximum working pressure of 21 MPa (3050 psi), specifically engineered for space-constrained medium-pressure hydraulic systems requiring precise directional control in a compact envelope.

The DG4M4-32A-200AC-20-JA features spool type 32A (spring offset A type, 2-position single solenoid) with 200V AC 50/60 Hz dual-frequency resin-molded coils that require no rewiring for different frequencies. The series offers multiple spool/spring arrangements: A type (spring offset A, 2-position single solenoid), B type (spring offset B, 2-position single solenoid), C type (spring centered, 3-position double solenoid), and no-spring type (2-position double solenoid). Single solenoid models weigh only approximately 0.9 kg, and double solenoid models approximately 1.2 kg.

This product is dimensionally and functionally identical to the original Eaton Vickers / TOKIMEC DG4M4 series valve, with a mounting surface conforming to ISO/DIS 4401-02-02. It offers true drop-in interchangeability for direct replacement of same-specification OEM valves without modifying piping systems or mounting interfaces. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, directional response verification, internal leakage measurement, and solenoid response characterization.

Technical Specifications 

General Specifications

• Model: DG4M4-32A-200AC-20-JA / DG4M4-32C / DG4M4-36C / DG4M4-30C / DG4M4-32B

• Product Series: DG4M4 (Size 02 / ISO/DIS 4401-02-02)

• Design Number: 20 design

• Design: Miniature subplate mounting solenoid directional valve, wet armature type

• Mounting Pattern: ISO/DIS 4401-02-02

• Mounting: Subplate mounting, any position

Hydraulic Parameters

• Maximum Working Pressure: 21 MPa (210 bar / 3050 psi)

• Allowable Tank Port Back Pressure: 7 MPa (70 bar / 1015 psi)

• Hydraulic Fluid: Mineral-based hydraulic oil, water-glycol based fluid (standard); phosphate ester (F3 option)

• Fluid Temperature Range: Refer to catalog specifications

• Filtration: ISO 4406 20/18/15 or better recommended

Spool/Spring Arrangements

• 32A: Spring offset A type (2-position, single solenoid)

• 32B: Spring offset B type (2-position, single solenoid)

• 32C: Spring centered type (3-position, double solenoid)

• 36C: Spring centered type (3-position, double solenoid, different spool function)

• 30C: Spring centered type (3-position, double solenoid, different spool function)

Electrical Parameters

• Solenoid Type: Wet armature, resin-molded coil

• Supply Voltage: 200V AC 50/60Hz (200AC) / 24 VDC (24DC) and other options available

• Coil Feature: 50/60 Hz dual frequency, two terminal coils require no rewiring for different frequencies

• Maximum Switching Frequency: 500 cycles/min (AC solenoid); 400 cycles/min (DC solenoid)

• Electrical Connector: Solenoid plug-in type terminal box (DIN 43650 connector type)

• Waterproof Connector: PG (optional)

• Indicator Light: M12 (with indicator light and surge suppressor, for DC solenoid)

• Electrical Options: Surge suppressor, AC/DC rectifier

Materials & Construction

• Coil Housing: Resin molded

• Valve Body: High-strength cast iron

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard) / F3 (for phosphate ester fluids)

Weight

• Single solenoid models: approx. 0.9 kg

• Double solenoid models: approx. 1.2 kg

Key Technical Advantages

1. Ultra-Compact Lightweight Design for Space Savings
The DG4M4 series is a core member of the Eaton Vickers miniature valve product line, featuring a compact mounting surface (ISO/DIS 4401-02-02). Single solenoid models weigh only approximately 0.9 kg, and double solenoid models approximately 1.2 kg, significantly reducing volume and weight compared to standard valves of the same size. This characteristic makes it particularly suitable for space-constrained hydraulic systems, portable equipment, and multi-valve integrated installations, delivering precise directional control within limited installation spaces.

2. Wet Armature Design with Resin-Molded Coil
The series employs a wet armature design where the armature operates in hydraulic fluid, effectively reducing shifting impact noise and wear while improving heat dissipation. The coil is resin-molded for excellent protection against moisture and dust in industrial environments. The coil features a 50/60 Hz dual-frequency two-terminal design requiring no rewiring for different frequencies, significantly simplifying spare parts management and system maintenance.

3. Multiple Spool/Spring Arrangements for Flexible Circuit Design
The DG4M4 series offers a complete range of spool/spring arrangements: A type (spring offset A, 2-position single solenoid), B type (spring offset B, 2-position single solenoid), C type (spring centered, 3-position double solenoid), and no-spring type (2-position double solenoid). The multiple function combinations meet diverse hydraulic circuit design requirements, including closed center, A/B to tank in center, and P blocked center conditions. The control spool is precision-ground from carburized steel with micron-level clearance control, ensuring low internal leakage and smooth shifting performance.

4. Comprehensive Electrical Options for Industrial Field Adaptability
The series features comprehensive electrical options including waterproof connectors (PG), indicator lights with surge suppressors (M12 for DC solenoids), surge suppressors, and AC/DC rectifiers (allowing AC solenoids to operate from DC power supplies). Standard DIN 43650 connectors support quick coil replacement without disturbing the hydraulic circuit. Maximum switching frequency is 500 cycles/min for AC solenoids and 400 cycles/min for DC solenoids, meeting high-cycle-rate application demands.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every DG4M4 series valve undergoes 100% bench testing prior to shipment, covering 21 MPa rated pressure holding, directional response time measurement, internal leakage verification, and solenoid response characterization. The mounting surface conforms to ISO/DIS 4401-02-02, with mounting dimensions, port positions, electrical interfaces, and performance curves strictly matched to the original Eaton Vickers / TOKIMEC DG4M4 series valve, enabling direct drop-in replacement without modifying piping or control programs. An adaptor plate DG4M4 to size 2 (DGAM-2-4-10) is available for CETOP 3/NG6 mounting surface systems.

Application Areas

• Machine Tools: CNC hydraulic clamping systems, small tool changer control, precision feed hydraulic circuits

• Portable Hydraulic Equipment: Hydraulic torque wrenches, portable hydraulic power packs, space-constrained hydraulic power units

• Automated Assembly Lines: Small hydraulic clamps, precision positioning mechanism directional control

• Material Testing Machines: Hydraulic loading direction control for small testing equipment

• Injection Molding Machine Auxiliary Circuits: Mold auxiliary actions, core puller directional control

• Industrial Robots: End effector hydraulic control systems

• Agricultural Machinery: Small-to-medium tractor hydraulic hitch system auxiliary control

• Special-Purpose Vehicles: Aerial work platform auxiliary hydraulic circuits

Expert Maintenance Tips

Installation Guidelines

1. The DG4M4 series can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO/DIS 4401-02-02 for direct installation on standard subplates or manifolds. For adaptation to size 3 mounting surfaces, an adaptor plate DG4M4 to size 2 (DGAM-2-4-10) is available.

2. Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes.

3. Electrical connections must use connectors conforming to DIN 43650, with optional waterproof connectors (PG) to maintain protection ratings. Control signal cables should be shielded, with the shield grounded at one end.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 20/18/15 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.

2. Solenoid Electrical Inspection: Periodically inspect connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. Maximum switching frequency is 500 cycles/min for AC solenoids and 400 cycles/min for DC solenoids; monitor for abnormal temperature rise.

3. Shifting Performance Verification: Periodically check each position for smooth shifting and absence of binding. If shifting response becomes sluggish or internal leakage increases, inspect spool wear and fluid contamination levels.

4. Seal Replacement: Standard NBR seals compatible with mineral-based and water-glycol hydraulic fluids. For phosphate ester hydraulic fluid applications, F3 seals are required. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.

5. Tank Port Back Pressure Management: Tank port back pressure must not exceed 7 MPa (70 bar). If system return back pressure is high, inspect the return line for blockage or undersized piping. Controlling back pressure within allowable limits during system design is recommended to reduce spool binding risk and extend valve service life.