Atos DHRZO-P5 Proportional Valve | DHRZO-P5-012/25 DHRZO-P5-010/25

The DHRZO-P5 Series proportional pressure reducing valves manufactured by Chengyuan Hydraulic are pilot-operated proportional components engineered for high-precision hydraulic control. This series is a perfect cross-reference to the Italian Atos standard, focusing on models such as DHRZO-P5-012/25, DHRZO-P5-010/25, and the integrated electronics version DHRZO-P5E-012/25 11.

The DHRZO is a three-way proportional valve designed to regulate output pressure linearly based on input electric signals. Chengyuan ensures 100% original-place interchangeability regarding mounting patterns (ISO 4401-03), electrical characteristics, and response dynamics. Every unit undergoes 100% dynamic simulation load testing at our facility to verify exceptional repeatability and minimal hysteresis, making it an ideal choice for advanced closed-loop hydraulic circuits.

Technical Specifications 

• Compatible Brand: Atos DHRZO Series

• Core Part Numbers: DHRZO-P5-012/25, DHRZO-P5-010/25, DHRZO-P5E-012/25

• Nominal Size: ISO 4401 Size 06 (NG6 / CETOP 3)

• Max Operating Pressure (Port P): 350 bar (35 MPa)

• Max Regulated Pressure: 25 bar (Per /25 specification)

• Max Flow Rate: 24 L/min

• Drive Voltage/Signal: 24V DC (0-10V or 4-20mA control via amplifier)

• Seal Material: High-performance NBR (Buna-N) or optional Viton (V/FKM)

• Ambient Temperature Range: -20°C to +70°C

• Ingress Protection: IP65 rated

Key Technical Advantages:

• High-Linearity Pilot Architecture: Utilizing high-performance proportional solenoids with precision-ground pilot needles. This provides high-resolution pressure control with hysteresis $\le 1.5\%$, essential for precision servo-proportional systems.

• Dynamic Stability Under Pressure Fluctuation: The internal pressure-balanced design enables the spool to resist interference from primary circuit pressure spikes. Output pressure remains stable even when Port P experiences drastic fluctuations.

• Wear-Resistant Hardened Spool/Sleeve: The core spool and sleeve are forged from premium alloy steel, vacuum-hardened to over $HRC 60$. Micro-level grinding ensures tight clearances, significantly enhancing resistance to particle contamination and extending operational life.

• Integrated Electronics (P5E Version): The “E” version includes an on-board electronic driver, eliminating the need for external cabinet-mounted amplifiers. Factory-preset parameters ensure plug-and-play capability with built-in protection against overloading and signal loss.

Application Areas:

• Variable Displacement Pump Control: Regulating the swashplate angle of high-pressure piston pumps.

• Proportional Braking Systems: Delivering smooth, controlled deceleration for heavy-duty machinery.

• Machine Tools & Plastics Machinery: Precise regulation of mold clamping, injection pressure, and pilot circuit reference pressures.

Expert Maintenance Tips:

• Zero Back-Pressure on Drain (Port Y): It is mandatory that the pilot drain line (Port Y) is connected directly and independently to the reservoir. Any back-pressure at Port Y will directly affect and destabilize the regulated output pressure.

• Strict Fluid Contamination Control: Proportional valves are highly sensitive. A high-pressure filter with at least $10 \mu m$ absolute rating is required. Maintain fluid cleanliness at NAS 7 or ISO 4406 18/15 standards.

• Shielded Electrical Cabling: For DHRZO-P5E versions with integrated electronics, always use shielded cables for control signals. Ensure the shield is properly grounded at one end to prevent high-frequency interference from industrial VFDs.