Atos RZMO Proportional Pressure Relief Valve | RZMO-P1 RZMO-P3 | High Response Proportional Control

Chengyuan Hydraulic presents the RZMO Series proportional pressure relief valves, expertly engineered as premium replacements for Atos industrial standards. This pilot-operated series, including RZMO-P1 and integrated versions like REB/RES, is designed for continuous and highly accurate hydraulic pressure regulation. As a cornerstone of precision control, Chengyuan ensures 100% Drop-in Interchangeability with original Atos units regarding subplate mounting (ISO 4401, Size 06) and electrical interfaces. Backed by our 100% Simulation Load Testing, each valve is rigorously validated for hysteresis, repeatability, and dynamic response times. This guarantees exceptional linear control for applications in plastic injection molding, ceramic pressing, and metallurgical machinery.

Technical Specifications

• Model Codes: RZMO-P1, RZMO-P3, RZMO-A, RZMO-REB

• Mounting Interface: Size 06 (ISO 4401-AB-03-4-A)

• Nominal Flow: Up to 4 L/min (Pilot flow control)

• Max Operating Pressure: Up to 315 bar (Available in 100, 210, 315 bar ranges)

• Control Signal: 0–10V DC or 4–20mA (Depending on driver type)

• Hysteresis: < 1.5% of the max range

• Repeatability: < ±1% of the max range

• Coil Resistance: 3.2 Ω or 4.7 Ω (at 20°C)

• Seal Material: NBR (Standard) / FKM (Optional for high temps)

• Ambient Temperature: -20°C to +70°C

Key Technical Advantages:

• High-Linearity Proportional Solenoids: Equipped with high-performance wet-pin solenoids that provide consistent force and minimal friction. Optimized magnetic properties ensure superior repeatability in pressure regulation.

• Precision Pilot Spool Craftsmanship: The pilot stage spool is made from high-strength alloy steel with deep quenching and precision grinding. This ensures stable relief characteristics even under high-frequency modulation and enhances resistance to fluid contamination.

• Rapid Dynamic Response: Internal galleries are optimized via computational fluid dynamics (CFD) to minimize flow resistance. Combined with fast-acting coils, the valve achieves millisecond-level response, shortening machine cycle times.

• Electronics Compatibility: Fully compatible with original E-MI-AC and E-BM-AC drivers, as well as integrated REB/RES amplifiers. This ensures seamless integration and superior Electromagnetic Compatibility (EMC).

Application Areas:

• Plastics Machinery: Pressure holding in injection molding and regulation in blow molding.

• Machine Tool Industry: Pressure compensation for CNC chucks and damping systems for presses.

• Metallurgy: Pressure control in continuous casting and hydraulic servo systems for rolling mills.

• Ceramic Presses: Precise simulation of complex forming pressure curves.

Expert Maintenance Tips:

• Contamination Control: Proportional valves are highly sensitive to dirt. Systems must maintain oil cleanliness at ISO 4406 18/16/13 or better, with a recommended 10μm return filter.

• Air Bleeding: After installation and before initial power-up, loosen the bleed screw at the end of the solenoid to exhaust trapped air. Air pockets can cause pressure instability and oscillations.

• Amplifier Calibration: Ensure the controller output current does not exceed the coil rating (typically ~2.5A) to prevent overheating and coil failure.