DHZO-AEB-NP-073-S5/Q 10 ATOS Proportional Valve NG06 350 bar 70 L/min

Product Overview

The DHZO-AEB-NP-073-S5/Q 10 is a direct-operated digital proportional directional valve from ATOS (Italy), sized NG06 (D03) with mounting interface conforming to ISO 4401-03.

The DHZO-AEB series is a direct-operated proportional directional valve without spool position transducer (LVDT) , featuring positive spool overlap. It is designed for open-loop directional control and non-compensated flow regulation. The valve contains a 4-way spool sliding within a 5-chamber body, directly driven by proportional solenoids. As the electrical input signal varies, the proportional solenoids generate a proportional electromagnetic force that directly displaces the spool, controlling both flow direction and flow rate.

The “AEB” code indicates the valve is equipped with an on-board analog electronic driver—eliminating the need for external separate amplifiers. The valve can be directly driven by PLC or controller analog signals. The “NP” code indicates no fieldbus interface. The “Q” code indicates enable signal configuration. The “10” suffix typically refers to a specific electrical connector configuration or version identifier.

The 073 specification represents a specific flow rating and spool function combination within the series. The S5 spool is a specific positive overlap spool configuration offering excellent repeatability (typical ±0.1% ).

As a direct replacement solution for the ATOS DHZO series, this product strictly complies with ATOS technical standards and offers complete interchangeability—direct drop-in replacement without any modification to mounting dimensions or electrical connections. Every unit undergoes 100% simulated duty cycle testing prior to shipment, ensuring performance reliability and long-term operational stability under actual working conditions.

Technical Specifications

• Model: DHZO-AEB-NP-073-S5/Q 10

• Series: DHZO (Direct-operated Digital Proportional Directional Valve)

• Brand: ATOS (Italy)

• Nominal Size: NG06 (D03)

• Mounting Interface Standard: ISO 4401-03

• Maximum Operating Pressure: 350 bar

• Maximum T-port Pressure: 160 bar (250 bar with external drain)

• Maximum Flow Rate: 70 L/min

• Spool Configuration: Bi-solenoid

• Control Type: Open Loop Proportional Directional Valve

• Position Feedback: Without spool position transducer (no LVDT)

• Spool Overlap: Positive overlap

• Electronic Driver: On-board analog driver (AEB)

• Fieldbus Interface: Not present (NP)

• Input Signal Type: Analog (±10V or 4-20mA)

• Spool Function: 073 (4-way, 3-position, open center)

• Spool Type: S5

• Repeatability: ±0.1% typical

• Net Weight: Approx. 3.1 kg

• Body Material: Cast iron

• Seal Material: NBR (standard) / FKM (optional)

• Fluid Media: Mineral-oil-based hydraulic fluids

• Bolt Height: 38 mm

Key Technical Advantages

1. Direct-Operated Design – Fast Response & Precise Control
The DHZO series features a direct-operated design—proportional solenoids directly drive the spool with no pilot stage delay. Step response time is ≤ 40 ms with frequency response up to 50 Hz. Compared to pilot-operated proportional valves, the direct-operated design delivers faster response and higher reliability in low-flow, high-precision applications.

2. On-Board Analog Driver – Simplified Wiring & Commissioning
The “AEB” code indicates an on-board analog electronic driver. Users no longer need to source and install separate external amplifiers—simply provide 24 VDC power and a standard analog signal (±10V or 4-20mA) to drive the valve directly. This significantly simplifies system wiring, reduces control cabinet space, and lowers commissioning complexity.

3. Positive Overlap Spool – Excellent Repeatability & Contamination Tolerance
This model features a positive overlap spool design, providing extremely low leakage in the neutral position. Positive overlap also makes the valve less sensitive to fluid contamination, offering excellent contamination resistance. Repeatability is typically ±0.1%, ensuring consistent control performance over long-term operation.

4. Five-Chamber Body Design – Optimized Pressure Balance & Low Leakage
The five-chamber body design ensures balanced spool forces during sliding. This effectively reduces hydraulic sticking forces, improving shifting reliability and service life. Optimized sealing construction ensures extremely low internal leakage.

5. Fully Encapsulated Coils – High Vibration Resistance & Environmental Durability
Proportional solenoid coils are fully plastic-encapsulated, offering excellent vibration resistance, shock resistance, and environmental protection. This makes the DHZO series particularly suitable for construction machinery, mobile equipment, and other applications subject to continuous vibration and shock.

6. Standardized ISO 4401 Mounting Interface – Plug-and-Play Compatibility
Mounting interface conforms to ISO 4401-03 (D03 / NG06) international standards, ensuring direct interchangeability with the vast majority of NG06 valve manifolds worldwide. The standardized interface guarantees plug-and-play compatibility with existing systems—no adapters or converters required.

Application Areas

• Injection Molding Machinery: Proportional control of multi-stage injection speeds and directions

• Hydraulic Presses & Die-Casting: Proportional speed and direction control for slides

• Construction Machinery Hydraulics: Proportional control for excavators, loaders, and implements

• Machine Tool Hydraulic Systems: Proportional speed and direction control for tool feeds

• Test Rigs & Laboratory Equipment: Precision flow and direction control for hydraulic test systems

• Industrial Automation Lines: Proportional direction and flow control for various hydraulic actuators

• Marine & Offshore: Proportional control for deck machinery, steering gears, and hydraulic systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness Control
The DHZO series features精密 clearances between spool and body, making it sensitive to fluid contamination. Maintain system fluid cleanliness at ISO 4406 16/13 (or NAS 1638 Class 8) or better. Install a high-pressure filter of no less than 10 μm absolute upstream of the valve inlet. Fluid contamination is the primary cause of spool sticking, sluggish response, and reduced control accuracy.

2. Electrical Connection & Signal Shielding
This model features an on-board analog driver (AEB) with analog input signals (±10V or 4-20mA). Signal lines should use shielded twisted-pair cables with the shield single-point grounded at the controller end to minimize electromagnetic interference. Use a stable 24 VDC power supply.

3. Mounting Surface Verification
Thoroughly clean the mounting surface prior to installation, ensuring surface roughness meets ISO 4401-03 requirements. Inspect O-ring seals for aging or damage—replace after every disassembly. Tighten mounting bolts in diagonal sequence over multiple passes to torque values specified in ATOS technical documentation.

4. Initial Commissioning & Parameter Setting
Before initial power-up, verify supply voltage and signal type match the valve configuration (voltage or current input). Perform proportional characteristic verification under actual system operating temperature and flow conditions using precision pressure gauges and flow meters at ports P, A, and B.

5. Seal Material Selection
Standard NBR seals are for mineral-oil-based hydraulic fluids. If the system uses phosphate ester or water-glycol fluids, FKM seals are required. Incorrect seal material selection will result in rapid seal degradation, leakage, and even spool sticking.

6. Scheduled Maintenance
Perform preventive maintenance every 2,000 operating hours or every six months:

• Verify input signal vs. output flow/direction relationship remains within specification

• Inspect electrical connections for looseness, oxidation, or corrosion

• Inspect O-ring seals for aging or damage (replace after every disassembly)

• Check for spool sticking or sluggish response

• Verify manual override functionality (if equipped)