Eaton Vickers DG4V Series Solenoid Valve | DG4V-3 DG4V-5 Directional Control Valve

The DG4V Series high-performance solenoid directional control valves manufactured by Chengyuan Hydraulic are heavy-duty fluid routing elements fully engineered to match global Eaton Vickers industrial footprints. This product line spans two central dimension categories: DG4V-3 (ISO 4401-03 / Size NG6) and DG4V-5 (ISO 4401-05 / Size NG10), serving as primary direction management units across machine tooling arrays, automated stamping presses, and continuous metallurgy mills. This comprehensive catalog supports specific ordering codes including the 3-position 4-way spring-centered DG4V-3-34C-M-P2-T-7-56 (closed P, P to A/B blocked, A/B to T), the high-capacity DG4V-5-6C-M-P7L-H-7-50 (all ports blocked at neutral), and the 2-position spring-offset DG4V-3-2AL-M-P7-T-7-56-JA48B fitted with high-tier electronics. Every singular DG4V valve undergoes 100% simulated load testing for dynamic high-pressure spool shifting, high-frequency cycling response, and null leakage limitations prior to shipping to ensure matching original performance metrics and deliver proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Series: Eaton Vickers DG4V Series Direct Solenoid Actuated Sliding Spool Directional Valves

• Model Configurations Supported: DG4V-3-34C-M-P2-T-7-56 / DG4V-5-6C-M-P7L-H-7-50 / DG4V-3-2AL-M-P7-T-7-56-JA48B

• Mounting Interface & Nominal Size:

  • DG4V-3 Framework: Size NG6 Interface (Compliant with ISO 4401-03, ANSI/NFPA D03 standards)

  • DG4V-5 Framework: Size NG10 Interface (Compliant with ISO 4401-05, ANSI/NFPA D05 standards)

• Maximum Operating Pressure (Ports P, A, and B):

  • DG4V-3 Standard Platform: Rated up to 350 bar (35 MPa / 5075 psi)

  • DG4V-5 High-Power Platform: Rated up to 315 bar to 350 bar

• Maximum Allowed Tank (T) Port Backpressure:

  • Standard wet-armature armature tube rated for up to 210 bar (21 MPa / 3045 psi), authorizing return line series piping

• Maximum Flow-Handling Envelopes:

  • DG4V-3 Configurations: Rated up to 80 L/min (21 USgpm)

  • DG4V-5 Configurations: High-capacity flow grid up to 120 L/min to 160 L/min (dependent on exact spool profile and loop fluid resistance)

• Solenoid Electrical Coil Formats (P2/P7/P7L/JA48B):

  • Code P2 Variant: 110V AC (50/60 Hz) input configuration

  • Code P7/P7L Variants: 24V DC input configuration, low-wattage heat deflection

  • Code JA48B Suffix: Specialized electric connection sockets and integrated surge protection components

• Spool Flow Function Configurations: 34C (Open crossover center, P blocked, A/B to T) / 6C (Closed center, all ports isolated) / 2AL (2-position, spring offset/offset-by-spring layout)

Key Technical Advantages:

• High-Tensile Ductile Iron Casting and CFD Optimized Corridors: The central valve block housing is cast from heavy-duty ductile iron using specialized precision-chill molds. Internal fluid core galleries are sculpted via Computational Fluid Dynamics (CFD) optimization to expand passage crossroads, trimming pressure drops ($\Delta p$) by 12% under peak flow conditions while mitigating localized hydraulic lock tendencies.

• Leak-Free Wet-Armature Coil Core Architecture: The heavy-shove pushpins are housed within hermetically encapsulated wet-armature armature tubes. Moving elements are continuously bathed, self-lubricated, and cooled by the hydraulic medium passing through the T-port, removing dynamic stem seals and completely eradicating the pushpin packing weep or drop-leakage failures common to standard sliding valves.

• Micron-Class Spool Clearance Calibration and High-Pressure Seals: The sliding spools are formed from high-carbon alloy steels, heat-treated, and multi-stage ground to lock radial matching clearance boundaries down to 2 to 4 micrometers ($\mu\text{m}$). This minimizes micro-bypass oil migration across the landing zones under a persistent 350 bar holding load, ensuring circuit integrity.

• Over-Molded Heavy Insulated Coil Pack Assemblies: Coils are over-molded with high-density engineering resins and jacketed in seamless steel shells, achieving Class H insulation thermal limits ($180^\circ\text{C}$) and IP65/IP67 ingress ratings. This construction prevents winding short-circuits or early magnetic decay when operated in the hot, humid, or heavily dust-laden atmospheres of mill floors and foundry floors.

Application Areas:

• Precision Machining Tools and CNC Stations: High-frequency index turret positioning, high-speed tool changer actuators, and heavy clamping blocks for milling centers.

• Industrial Stamping Presses and Plastic Processing Systems: Core pilot or auxiliary distribution commands managing injection ejector pin sub-circuits, sheet metal stamp cushions, and modular HPU manifold clusters.

• Mobile Handling Equipment and Marine Deck Gear: Outrigger stabilizer jack selectors for truck cranes, hydraulic marine rudder actuators, and heavy materials-handling slide gates.

Expert Maintenance Tips:

• Rigidly Control T-Port Backpressure Redlines: Although the wet-armature tubes are rated to withstand tank line backpressures up to 210 bar, if transient return spikes exceed this threshold, the core armature tubes will undergo mechanical distortion, immediately jamming the internal sliding spool. It is highly recommended to run the tank return lines directly and independently back to the fluid reservoir.

• Pre-Lubrication Air Purge and Manual Override Routine: When powering up a freshly mounted valve or restarting a dry system block, trapped air pockets will cause harsh fluid knocking and clicking. Before sending electrical commands, compress the manual rubber-cap override pins on the solenoid snout using a blunt punch tool several times to cycle the spool, flush air from the chambers, and pre-lubricate the sliding landings.

• Calibrated Fastener Torque Specifications: The 4 mounting bolts for the DG4V-3 (NG6) platform require an exact torque limits of ~8.5 N·m; the larger DG4V-5 (NG10) array demands ~50 N·m. Always execute torque patterns using a calibrated wrench in a diagonal, step-wise cross pattern. Over-tightening or loading unevenly will induce micro-bending inside the valve bore, jamming the spool and preventing its spring return.