DHI-0714 Atos Solenoid Directional Valve 60 L/min 350 Bar

Product Overview

The SDHE/DHE/DHI series solenoid directional valve (including models DHI-0714 23, DHE-0714 24DC, and SDHE-0631/2 23) is manufactured to original ATOS technical standards, covering three product families: DHI, DHE, and SDHE, all belonging to size 06 (NG6 / CETOP 3 / ISO 4401-03 / NFPA D03) direct-acting solenoid directional control valves. Featuring a wet armature solenoid directly driving the spool in a spool valve design, with a mounting surface conforming to ISO 4401, the series is used for directing and stopping flow at any point in a hydraulic system, providing precise directional control of hydraulic actuators.

The DHI-0714 23 features spool type 71 (double solenoid, 3-position, spring centered) equipped with 24 VDC wet-pin DC solenoids and manual override, with maximum flow of 60 L/min (15.85 GPM) and maximum operating pressure of 350 bar (5075 psi) on ports P/A/B, with 120 bar (1740 psi) on port T. The DHE-0714 24DC features spool type 14 (double solenoid, 3-position, spring centered) with maximum flow of 80 L/min (21 USgpm), tank port rating of 210 bar (3045 psi) for DC solenoids, and solenoid power of 33 W (24V/1.33A). The SDHE-0631/2 23 features spool type 0631/2 (double solenoid, 2-position, spring return) with maximum flow of 80 L/min, maximum operating pressure of 350 bar, 24 VDC solenoids, and safety-type solenoid with position monitoring.

It should be noted that the DHI series is currently in the phase-out stage and has been gradually replaced by DHL and DHE series valves since 2022. The DHE series maintains the same mounting dimensions and performance parameters while offering enhanced configurations including safety-type FI/FV functions, special seal BT/EP options, cURus certified solenoids, and XJ/XS plugs. This product is dimensionally and functionally identical to the original ATOS valves, with a mounting surface conforming to ISO 4401 size 06, offering true drop-in interchangeability for direct replacement of same-specification OEM valves without modifying piping systems or mounting interfaces.

Technical Specifications 

General Specifications

• Model: DHI-0714 23 / DHE-0714 24DC / SDHE-0631/2 23

• Product Series: DHI / DHE / SDHE (Size 06 / NG6 / CETOP 3 / ISO 4401-03 / NFPA D03)

• Design: Direct-acting, subplate mounting solenoid directional valve with wet armature solenoids

• Ways/Positions: 4-way 2-position / 4-way 3-position

• Mounting Pattern: ISO 4401 / CETOP 3 / NG6 / NFPA D03

• Installation Position: Any (except no-spring types 70/77 for impulse operation must be horizontal)

Hydraulic Parameters (DHI-0714 23)

• Maximum Flow Rate: 60 L/min (15.85 GPM)

• Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)

• Maximum Tank Port Pressure (Port T): 120 bar (1740 psi)

• Spool Type: 71 (Double solenoid, 3-position, spring centered)

• Hydraulic Fluid: Mineral-based hydraulic oil (HL, HLP, HLPD, HVLP, HVLPD)

• Viscosity Range: Recommended 15 – 100 mm²/s, max allowable 2.8 – 500 mm²/s

• Fluid Temperature Range: NBR seals -20°C to +60°C

• Filtration: ISO 4406 21/19/16 (NAS 1638 Class 10)

• Weight: approx. 1.8 kg

Hydraulic Parameters (DHE-0714 24DC)

• Maximum Flow Rate: 80 L/min (21 USgpm)

• Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)

• Maximum Tank Port Pressure (Port T): 210 bar (3045 psi) DC / 160 bar (AC)

• Spool Type: 14 (Double solenoid, 3-position, spring centered)

• Weight: approx. 2.2 kg

• Bolt Height: 22 mm

Hydraulic Parameters (SDHE-0631/2 23)

• Maximum Flow Rate: 80 L/min (21 USgpm)

• Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)

• Maximum Tank Port Pressure (Port T): 210 bar (DC version) / 160 bar (AC version)

• Spool Type: 0631/2 (Double solenoid, 2-position, spring return)

• Weight: approx. 1.5 kg

• Bolt Height: 22 mm

Electrical Parameters

• Supply Voltage: 24 VDC / 110V AC 50/60Hz / 220V AC 50/60Hz

• Voltage Tolerance: ± 10%

• Solenoid Type: Wet armature, DC and AC coils interchangeable without tools

• Solenoid Power (DHE-0714 24DC): 33 W (24V / 1.33A)

• Coil Insulation Class: Class H (180°C)

• Electrical Connector: DIN 43650 standard connector

• Protection Class: IP65 (standard) / IP67 (optional, with AMP Junior Timer plug)

• Duty Cycle: Continuous (ED = 100%)

• Manual Override: Standard

• Certification: cURus certified solenoids (DHI/DHE series)

Materials & Construction

• Valve Body: Cavity-type cast housing with enlarged internal flow passages

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard) / FKM (/PE option) / HNBR (/BT option)

• Surface Protection: Zinc coating with black passivation; salt spray test > 200 h (EN ISO 9227)

Key Technical Advantages

1. Direct-Acting Spool Design for Fast Response
The series employs a direct-acting spool design where the solenoid directly drives the spool without pilot-stage delay, achieving fast response. The control spool is precision-ground from carburized steel with micron-level clearance control. The wet armature solenoid places the armature in hydraulic fluid, effectively reducing shifting impact noise and wear while improving heat dissipation. Moving parts are immersed in oil for protection, lubrication, and cushioning, significantly improving switching reliability and service life.

2. Cavity-Type Body Design with Low Pressure Drop
The valve body is manufactured using cavity-type casting with optimized internal flow passages and enlarged flow area, effectively reducing pressure loss. The DHI-0714 series achieves 60 L/min flow capacity in NG6, while the DHE/SDHE series achieves up to 80 L/min in NG6, combined with maximum operating pressure of 350 bar, delivering exceptional hydraulic control performance in a compact installation envelope.

3. Multiple Spool Options for Flexible Circuit Design
The series offers multiple interchangeable spool functions: type 61 (single solenoid, center + end position, spring centered), type 63 (single solenoid, 2-position, spring offset), type 67 (single solenoid, center + end position, spring offset), type 70 (double solenoid, 2-position, no spring), type 71 (double solenoid, 3-position, spring centered), type 75 (double solenoid, 2-position, mechanical detent), and type 77 (double solenoid, center + end position, no spring). The multiple function combinations meet diverse hydraulic circuit design requirements, from simple directional switching to complex center unloading, center closed, and differential circuits.

4. High-Reliability Electrical System with Flexible Coil Options
The series features wet armature flange-type solenoid tubes, with DC and AC coils interchangeable without tools, significantly simplifying spare parts management and maintenance. Coil insulation is Class H (180°C), with standard IP65 protection and optional IP67 protection (with AMP Junior Timer plug or extended lead plug). DHE series solenoid power is 33 W (24V / 1.33A), providing sufficient switching force while controlling energy consumption. Standard manual override button is provided for commissioning and maintenance under power-off conditions.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every valve undergoes 100% bench testing prior to shipment, covering 350 bar rated pressure holding, directional response time measurement, internal leakage verification, and solenoid response characterization. The valve body features zinc coating with black passivation, with salt spray test exceeding 200 hours (EN ISO 9227) and MTTFd of 150 years (per EN ISO 13849). Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original ATOS valves, with a mounting surface conforming to ISO 4401 size 06, enabling direct drop-in replacement without modifying piping or control programs.

Application Areas

• Industrial Hydraulic Systems: Directional control for general industrial hydraulic applications including presses and clamping systems

• Machine Tools: CNC hydraulic clamping systems, tool changer control

• Injection Molding Machines: Mold opening/closing direction control, ejector system control

• Metallurgical Equipment: Continuous casting machines, rolling mill auxiliary directional control

• Mining Equipment: Hydraulic support direction control, drilling rig feed circuits

• Marine Hydraulics: Steering gear control, deck machinery hydraulic systems

• Testing Equipment: Material testing machine hydraulic loading direction control

• Mobile Hydraulic Equipment: SDHE series for mobile hydraulic systems requiring safety function monitoring

Expert Maintenance Tips

Installation Guidelines

1. The series can be mounted in any position, except no-spring types (70/77) for impulse operation which must be installed horizontally. Mounting surface roughness must be Ra 0.4 with flatness 0.01/100 (ISO 1101). Tighten mounting bolts diagonally in stages to the specified torque value.

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 (B10≥75 recommended) for a minimum of 30 minutes. Fluid cleanliness requirement is ISO 4406 21/19/16 (NAS 1638 Class 10) or better.

3. Electrical connections must use connectors conforming to DIN 43650 to maintain IP65 protection. Control signal cables should be shielded, with the shield grounded at one end.

4. The valve body features zinc coating with black passivation, with salt spray test exceeding 200 hours, suitable for humid and corrosive industrial environments.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 21/19/16 (NAS 1638 Class 10) 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%. Coil insulation is Class H (180°C); monitor for abnormal temperature rise. DHE-0714 24DC solenoid power is 33 W (24V/1.33A).

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 hydraulic fluids. For phosphate ester fluids, FKM seals (/PE option) are required; for biodegradable fluids, HNBR seals (/BT option) are required.

5. Tank Port Back Pressure Management: DHI-0714 series tank port maximum pressure is 120 bar; DHE/SDHE series DC solenoid tank port maximum pressure is 210 bar and 160 bar for AC solenoids. If system return back pressure is high, inspect the return line for blockage or undersized piping.

6. DHI Series Replacement Recommendation: The DHI series is currently in the phase-out stage. For new system designs or maintenance replacements, the DHE series is recommended to obtain enhanced configurations including safety-type FI/FV functions, special seal options, and cURus certification.