Atos Solenoid Valve | DHA-0611 DHA-0631 DHA-0711 Replacement

Genlu Hydraulic customizes, engineers, and distributes heavy-duty industrial fluid controls optimized for hazardous locations, stringent explosion-proof safety matrix setups, and high-frequency cyclical shifts. The DHA and DHI Series High-Performance Solenoid Directional Valves are precision-manufactured as robust, micro-engineered, and 100% drop-in interchangeable solutions to directly reference the flagship direct-operated solenoid lines engineered by Atos (including standard DHI, explosion-proof DHA, low-power DHO, high-response DHU, and proportional relief DHRZO variants). We support complete, ready-to-ship supply constraints for globally operating systems requiring DHA-0611, DHA-0631, DHA-0711, and DHA-0713 valve bodies, including complex modified configurations such as DHA-0611/M 24DC and DHA-0631/2/M/7 24DC.

In petrochemical refineries, underground coal mining logistics, offshore drilling decks, and dust-intensive processing lines, a directional valve’s explosion-proof casing integrity, zero-drift internal sealing, and thermal electrical continuous duty cycles determine the absolute safety factor of the installation. Genlu’s DHA explosion-proof and DHI standard valves map identically to original manufacturer blueprints. They retrofit seamlessly onto existing standard ISO 4401-03 (CETOP 3 / NG6) subplates, maintaining exact compliance across electrical coil impedances, hazardous zone certified protection codes (matching Ex d IIC T6 benchmarks), and factory spool-flow profiling. Prior to shipping clearance, every valve is run through 100% Full-Simulation Condition Testing on a high-pressure digital test standalone loop to record real-time flow delays, cross-port tracking, and leakage indicators under maximum load spikes.

Technical Specifications 

• Product Series: DHA Series Explosion-Proof Direct-Operated Solenoid Directional Valve (Fully cross-compatible with Atos DH collections)

• Core Covered Model Configurations:

  • DHA-0611/M 24DC 24 Block (2-position, 3-way layout, with manual override lever, 24V DC operating coil)

  • DHA-0631/2/M/7 24DC 24 Block (3-position, 4-way layout, open-center Y-spool configuration, with inductive proximity sensor and manual lever, 24V DC)

  • DHA-0711 / DHA-0713 Platforms (Standard 2-position, 4-way directional configurations)

• Interface Specification Profile: NG6 / CETOP 03 Interface Dimensioning (Fully compliant with ISO 4401-03 subplate patterns)

• Maximum Continuous Operating Pressure: Rated up to 350 bar (35.0 MPa / 5075 psi) across P, A, and B high-pressure inlet channels

• Maximum Permissible Tank Port Back-Pressure: Port T rated up to 210 bar (3045 psi) under steady DC coil energization

• Maximum Volumetric Flow Delivery: Rated up to 80 $L/min$ (Conditioned by individual spool configuration geometry)

• Solenoid Coil Rated Voltage & Input: 24V DC (Standard 24DC setups, utilizing low-consumption coil windings for explosion-proof thermal compliance)

• Explosion Protection Certification Mapping: Engineered to fully comply with Ex d IIC T6 Gb flameproof enclosures, matching international ATEX and IECEx design standards

• Sealing Elastomer Configuration: High-performance Viton (FKM) sealing structures fitted as standard, compatible with phosphate ester fire-resistant hydraulic fluids and mineral oils

Key Technical Advantages:

• Certified Flameproof Enclosure for Hazardous Areas: The core coil driver structures of the DHA-0611 and DHA-0631 models feature heavy-walled, high-tensile precision cast steel flameproof housings. Built-in internal flame paths are precision-machined to safely contain and extinguish any internal electrical ignition, preventing the propagation of sparks into volatile external processing atmospheres.

• Deep Cryogenic Spool Conditioning for Near-Zero Internal Slip: The control spools are machined from specialized alloy tool steel treated via -196°C deep cryogenic tempering. This process eliminates retained austenite to prevent long-term thermal expansion. Lapped to the internal cast bore within micron-level tolerances, the spool configuration yields exceptionally low cross-port leakage at 350 bar, preventing actuator drifting.

• Integrated Multi-Functional Field Modifiers (/M Lever & /7 Proximity Switch): The product matrix incorporates premium mechanical options: the /M code provides a ruggedized, fully integrated manual override lever for unpowered commissioning or emergency manual shifting; the /7 option integrates a heavy-duty spool position monitoring proximity switch to feed real-time mechanical shifting data back to the master PLC loop.

• CFD-Optimized 5-Chamber Body with Lower Pressure Drop ($\Delta P$): The valve body utilizes a cast 5-chamber internal architecture refined via computational fluid dynamics (CFD) to smooth out internal flow paths. Even at a full fluid flow of 80 $L/min$, localized flow restriction through the core orifices is minimized, limiting temperature spikes in the hydraulic reservoir during high-frequency cycles.

Application Areas:

• Oil & Gas Upstream Logistics: Automated drill-string manifold control blocks, surface emergency shutdown valve (SSD) hydraulic control boxes, and offshore subsea production trees.

• Underground Mining Equipment: High-security flameproof power packs for shearers, continuous mining machinery, and underground belt tensioning manifolds.

• Chemical & Combustible Dust Industries: Chemical batch processing machines, industrial automated paint spray lines, and grain silo material handling elevators.

Expert Maintenance Tips:

• Rigid Protection of Flameproof Mating Joints: The metal-to-metal mating surfaces between the flameproof coil box cover and the valve housing are machined to strict tolerances to function as an explosion barrier. Never pry these covers open with a flathead screwdriver or drop tools onto the exposed surfaces during wiring. Before reassembly, apply a thin layer of anti-corrosion grease and torque all fasteners down securely; any deep score lines or uneven gap spacing will compromise the explosion-proof protection.

• Mandatory Synchronization Audits for /M Levers and /7 Proximity Sensors: For hybrid valve builds featuring both manual levers and proximity sensors, manually cycle the lever under zero system pressure after field replacement to confirm that the spool-position feedback signal registers accurately on the PLC. If shipping vibrations have moved the proximity sensor, turn the fine-thread backing screw to realign it until the mechanical stroke matches the electrical feedback signal.

• Verify Subplate Mounting Bolt Specifications and Torque Limits: The M5 mounting hardware on a CETOP 3 (NG6) footprint handles significant upward pressure pulses during shifting cycles. Always use four 12.9 grade high-tensile socket head cap screws and tighten them in a cross-pattern sequence to 8–9 N·m using a calibrated torque wrench. Substandard hardware or uneven torque can stretch the bolts, causing the high-pressure subplate O-rings to extrude or leak under 350 bar loads.