Atos DHZO DHZE Series Proportional Valve | DHZE-A-071-L5 | DHZO-A-073-L1 | Hydraulic Directional Valve

The DHZO and DHZE Series electro-hydraulic proportional valves from Chengyuan Hydraulic are high-performance directional valves designed for precise control of both direction and flow velocity. These valves offer 100% original-place interchangeability with Atos brand units. Both DHZO (Size 06) and DHZE (Size 10) feature a direct-operated design with high-performance solenoids that adjust spool position proportionally to the input electrical signal. Each valve undergoes 100% simulated condition testing, ensuring minimal hysteresis and high repeatability in sophisticated closed-loop control systems.

Technical Specifications 

• Representative Models: DHZE-A-071-L5 10/PE, DHZO-A-073-L1/20, DHZE-A-071-S5/10

• Standard Interface: DHZO (ISO 4401 Size 06 / NG6); DHZE (ISO 4401 Size 10 / NG10)

• Maximum Operating Pressure: $350\text{ bar (35 MPa / 5075 psi)}$

• Maximum Flow Rate: DHZO up to $50\text{ L/min}$; DHZE up to $100\text{ L/min}$

• Spool Configurations: L1, L3, L5, S3, S5 (Linear or Progressive)

• Control Signal: Standard Current (e.g., $0\text{–}1.5\text{A}$)

• Hysteresis: $\le 3\%$ of maximum stroke

• Repeatability: $\le 1\%$ of maximum stroke

• Fluid Compatibility: Mineral oils, water-glycol, or synthetic fluids (with compatible seals)

Key Technical Advantages

• Advanced Flow-Optimized Casting: The valve bodies are manufactured using high-quality casting processes to minimize internal pressure drops ($\Delta P$). This results in higher energy efficiency and smoother operation during rapid directional changes.

• High-Frequency Proportional Solenoids: Features wet-pin solenoids where the core moves in oil. This ensures self-lubrication, excellent heat dissipation, and a highly linear electromagnetic force output, enabling response frequencies up to $40\text{–}60\text{ Hz}$.

• Ultra-Precision Spool-to-Body Fit: Spools are induction-hardened and precision-ground to exacting tolerances. This ensures minimal internal leakage at $350\text{ bar}$, maintaining exceptional stability for actuators during micro-positioning.

• Superior Linearity and Reversibility: Thanks to precise centering springs and balanced magnetic forces, the DHZO/DHZE series exhibits outstanding linearity across the full stroke, allowing for smooth, step-free velocity control.

Application Areas

• Industrial Automation: Feed control for CNC machines and proportional pressure/speed control in injection molding machines.

• Metallurgy: Precision position control for continuous casting and rolling mill adjustment systems.

• Testing Equipment: Load simulation for fatigue testing machines and hydraulic test benches.

Expert Maintenance Tips

• Mandatory Fluid Cleanliness: Proportional valves are highly sensitive to contaminants. System filtration must be maintained at $10\mu\text{m}$ (ISO 4406 18/16/13) or better to prevent spool sticking or accuracy drift.

• Amplifier Synchronization: Ensure the drive current matches the coil impedance. For optimal results, use Chengyuan’s dedicated proportional amplifiers to utilize dither signals, which minimize static friction.

• Mounting Surface Integrity: Ensure the mounting surface flatness is $\le 0.01\text{mm}$. Use a torque wrench to tighten mounting bolts evenly to prevent valve body distortion.