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

The Vickers Eaton DG4V Series premium industrial-grade high-pressure, high-frequency solenoid-operated directional spool valves manufactured by Chengyuan Hydraulic are fluid control components engineered to perfectly match the rigorous design specifications of Vickers (Eaton Fluid Power System / Danfoss framework). This robust aftermarket alternative product matrix thoroughly addresses the intense cycling and sub-millisecond response demands inside high-production factory floor automation and mobile control manifolds, featuring standard size 6 configurations (DG4V-3-0C-U-H-100, DG4V-3-23A-M-P7-H-7-52) and heavy-duty, high-flow size 10 assemblies (DG4V-5-0AL-M-P7L-OV-6-40).

Functioning as the critical directional control brain managing CNC cylinder stroke advancement, multi-stage pressure circuit routing, and sequence interlock operations, a directional valve’s switching hysteresis, internal land leakage, anti-hydraulic lock characteristics, and solenoid thermal force stabilization dictate total machine runtime and process repeatability. The DG4V pedigree is globally recognized for its unique wet-armature solenoid configuration and fluid-flow path topology designed to minimize pressure drop. Chengyuan guarantees 100% original-place drop-in interchangeability across all units regarding standard plate-mounting surfaces (ISO 4401-03 / Cetop 3 for DG4V-3; ISO 4401-05 / Cetop 5 for DG4V-5), precision spool-to-bore clearances, and versatile electrical connection formats (M-DIN 43650 Hirschmann or U-integrated conduit junction boxes). Every valve undergoes 100% full-capacity simulated pressure, extreme spool flow limits, and cross-port seal integrity verification on computerized diagnostics rigs, ensuring crisp execution and a long lifecycle under 31.5 MPa system demands.

Technical Specifications 

• Compatible Brand Standard: Vickers / Eaton / Danfoss (Industrial Directional Valve Standard)

• Target Replacement Configurations: DG4V-3-0C-U-H-100, DG4V-3-23A-M-P7-H-7-52, DG4V-5-0AL-M-P7L-OV-6-40

• Nominal Size & Mounting Subplate Pattern:

  • DG4V-3 Sub-series: Nominal Size 6 (NG6 / Cetop 3 / ISO 4401-03 standard footprint)

  • DG4V-5 Sub-series: Nominal Size 10 (NG10 / Cetop 5 / ISO 4401-05 standard footprint)

• Spool Flow Symbol & Positioning Mechanical Mechanism:

  • 0C Function: 3-position, 4-way, all ports closed in center position (Closed Center O-type spool), spring centered.

  • 23A Function: 2-position, 4-way, specialized cross-over unloading transition state, spring offset/spring return.

  • 0AL Function: 2-position, 4-way, single solenoid actuator, cross-port A-offset layout with left hand limitation.

• Maximum Allowable Operational Pressure Boundary:

  • High-Pressure Ports P, A, and B: Up to 31.5 MPa (315 bar / 4,500 psi)

  • Tank Port T (Allowable Backpressure): Standard versions allow up to 7.0 MPa to 16.0 MPa under specialized continuous backpressure configurations.

• Maximum Flow Capacity Threshold:

  • DG4V-3 (NG6) Models: Up to 80 L/min (21 USgpm)

  • DG4V-5 (NG10) Models: Up to 120 L/min (32 USgpm)

• Solenoid Actuator & Electrical Coil Identifiers:

  • H Designation: High-performance, heavy-duty wet armature solenoid assembly.

  • Voltage Coil Suffix (e.g., P7 / P7L): Configured for 220V AC 50/60 Hz single phase AC lines; 100 denotes 115V AC compatibility.

  • M / U Electrical Interface: M specifies standard DIN 43650 (ISO 4430) Hirschmann detachable plug connector; U denotes a fully sealed metallic conduit terminal wiring enclosure.

• Total Assembly Structural Weight: DG4V-3 single solenoid approx. 1.5 kgs, dual solenoid approx. 2.1 kgs; DG4V-5 dual solenoid approx. 4.8 kgs.

Key Technical Advantages:

• 5-Chamber Symmetric Valve Body Casting Minimizing Pressure Drop: The primary valve manifold is cast from high-grade resin-bonded cast iron, utilizing an advanced five-chamber internal configuration. This engineering design ensures optimized cross-sectional flow transitions, significantly cutting flow path restrictions. When delivering a full 80 L/min via the DG4V-3 core, operational loop fluid pressure drop is reduced by over 15%, curbing oil temperature spikes.

• Case-Hardened Spools with Precision-Ground Balancing Grooves: The centralized regulating spool is forged from premium alloy tooling steel, vacuum hardened to reach HRC 58-60, and finished via centerless micro-grinding. Precision-engineered annular hydrostatic balancing grooves wrap the spool lands to equalize side-loading hydraulic forces, completely eliminating “hydraulic lockup” even when held under 31.5 MPa pressures for extended periods.

• Oil-Immersed Wet Armature Design Dampening Acoustic Noise: The solenoid armature operates entirely submerged within the hydraulic oil loop (wet-armature design). The fluid absorbs mechanical impact vibrations and kinetic shocks during shifting cycles, eliminating the loud metallic clatter typical of dry-solenoid valves and converting dynamic shaft seals into reliable static seals. This prevents external weeping past the push pins and extends operational lifecycles up to 10 million cycles.

• High-Insulation Pure Copper Coils Resisting Thermal Overloads: The actuator coils are wrapped with premium imported insulated pure copper wire and encapsulated via high-pressure flame-retardant epoxy molding to attain IP65 weatherproofing. Built to tolerate a wide voltage variation window ($\pm 10\%$), these coils resist insulation breakdown. This ensures consistent solenoid pulling force without thermal fade during high-ambient, continuous duty or fast-cycling operations.

Application Areas:

• High-Precision CNC Machine Tools & Automated Work-holding Jigs: Actuating fast clamping rams, automated indexing tool turrets, and managing reciprocating subplate logic on large portal milling stations.

• Plastic Injection Molding & Rubber Forming Machinery: Supplying reliable pilot directional signals inside major manifold control blocks and powering secondary functions on blow-molding machines.

• Heavy-Duty Industrial Balers & Metal Scrap Shear Systems: Directing main actuator sequencing loops on automatic compacting systems and managing secondary high-pressure stage shifts.

Expert Maintenance Tips:

• Enforce Strict Coplanar Manifold Torquing to Shield Slim Spool Clearances: When bolting a DG4V-3 or DG4V-5 valve onto a hydraulic subplate or multi-station manifold block, the mounting surface flatness must be held to $\le 0.01mm/100mm$ with a surface finish of $\le Ra1.6$. Use a calibrated torque wrench to tighten the four high-tensile mounting bolts in a diagonal sequence (8-10 Nm for DG4V-3; 12-15 Nm for DG4V-5). Distorted or uneven subplates combined with over-torquing will warp the thin valve body, causing the micro-clearance spool to bind up or fail to spring-return upon de-energization.

• Prevent Simultaneous Dual Solenoid Energization via Strict Electrical Interlocks: For double-solenoid configurations (such as the 0C closed-center spool), you must hardwire a mechanical/electrical interlock or program strict software exclusion logic inside the PLC to guarantee that both coils can never be energized at the same time. Simultaneous dual actuation causes the opposing armatures to smash together, generating excessive heat that will burn out and char the solenoid coils within 3 minutes.

• Manage Tank Port T Backpressure limits to Protect Core Armature Tubes: The wet-armature core tubes have a specific static backpressure threshold. Route the電磁阀 tank line (T-port) independently back to the hydraulic reservoir whenever possible, shielding it from high-pressure return spikes. Combining the T-port with other high-flow return lines can introduce severe pressure pulsations that cause fatigue in the welded core tubes, risking tube failure and external oil spraying.