Atos RZMO Series Proportional Pressure Relief Valve | RZMO-REB RZMO-P1

The RZMO Series of pilot-operated proportional pressure relief valves manufactured by Chengyuan Hydraulic are high-fidelity, high-precision electro-hydraulic control elements engineered to fully cross-reference Italian Atos technical standards. Designed to provide seamless, infinitely variable pressure adjustments in sophisticated hydraulic circuits, this series serves as a cornerstone for automated load management. Covering the high-demand technical designations RZMO-REB-P-NP-030/315 (integrated digital electronics), RZMO-P1-010/100, and RZMO-P1-02-REB-P-NP-010/210, Chengyuan guarantees 100% original-place interchangeable compatibility across standard subplate mounting patterns (ISO 4401-03/05) and internal fluid profiles. Every valve undergoes 100% simulated load testing for dynamic hysteresis and response linearization prior to dispatch, ensuring stable performance under harsh 315 bar operating envelopes.

Technical Specifications :

• Brand Compatibility: Atos RZMO Series Matrix

• Target Model Configurations: RZMO-REB-P-NP-030/315, RZMO-P1-010/100, RZMO-P1-02-REB-P-NP-010/210

• Nominal Standard Sizes: Size 06 (NG6 / ISO 4401-03) and Size 10 (NG10 / ISO 4401-05 subplate mounting)

• Electronics Configuration:

  • P1: Basic version (Requires external driver/amplifier card)

  • REB-P-NP: Integrated basic digital amplifier (Features proportional coil, no pressure transducer, NP designates standard analog inputs)

• Max. Adjustable Pressure Limits: 100 bar / 210 bar / 315 bar (Per model suffix ratings)

• Maximum Passing Flow Capacity: Up to 40 L/min for Size 06; Up to 120 L/min for Size 10

• Command Input Interface: 0-10 V DC voltage or 4-20 mA current reference signals (Software adjustable via REB interface)

• Supply Voltage Requirement: 24V DC nominal stable power

• Hysteresis & Repeatability Limits: Hysteresis $\le 1.5\%$, Repeatability $\le 1\%$ of max setting

Key Technical Advantages:

• On-Board Digital Processing (REB-P-NP Architecture): The integrated driver board is physically mounted directly to the proportional solenoid capsule, with pre-calibrated scale gain and dead-band adjustments from the factory. The electronics are sealed using heavy-duty waterproofing resins to absorb mechanical shocks, plugging directly into PLC networks while wiping out long-distance cable signal degradation.

• Case-Hardened Pilot Poppet Geometry: The secondary pilot poppet and corresponding seat are machined from premium alloy steels, induction hardened and mirror-polished. Under severe 315 bar discharge velocities, this metallurgy resists fluid cavitation and erosion, eliminating localized setting drift and securing consistent pressure holding over long duty cycles.

• Low-Hysteresis Frictionless Solenoid Armature: The internal armature runs within self-lubricating Teflon-coated guide bushes, drastically reducing raw mechanical friction coefficient during rapid shifting. Paired with fine-wound calibration springs, the total valve hysteresis stays below 1.5%, delivering a highly linear ramp curve that mitigates shock waves in actuators.

• Monoblock Cast Steel Enclosure with Low $\Delta p$ Channels: The main valve casing is constructed from high-tensile ductile cast steel to effortlessly manage continuous high-pressure cycles. The core galleries are hydrodynamically optimized using CFD analysis, minimizing pressure drop ($\Delta p$) at maximum flow (120 L/min) to cut hydraulic heat generation.

Application Areas:

• Plastics & Rubber Processing Machinery: Multi-stage proportional clamp and holding-pressure regulation for injection molding equipment.

• Metal Forging & Hydraulic Presses: Infinite pressure calibration for primary press cylinders and proportional braking/balancing setups on CNC press brakes.

• Heavy Automation & Woodworking Presses: Multi-axis constant-pressure synchronization manifolds for heavy plywood pressing lines.

Expert Maintenance Tips:

• Enforce Strict ISO 4406 18/16/13 Fluid Cleanliness Standards: Proportional valves are vulnerable to fluid contamination due to their micro-orifices. The system must be fitted with premium glass-fiber inline filtration featuring an absolute rating of at least 10 microns ($\beta_{10} \ge 75$). Silt and fine debris will cause pilot-stage stiction, leading to erratic pressure spikes, system failure, or high-frequency chattering.

• Shield Control Cables and Ground the Shielding Layout: For RZMO-REB models with integrated electronics, always run command and feedback lines through twisted, shielded cables with the shield grounded at the control cabinet end only. Ensure the 24V DC power rail is robust (minimum 2.5A allocation per valve coil) to prevent voltage sags that compromise solenoid output force.

• Execute Manual Solenoid Cavity Bleeding Prior to Startup: Air pocket traps inside the proportional armature sleeve cause an unstable “air cushion effect” that results in pressure oscillations or delayed response. With the circuit running at low pressure during commissioning, slowly loosen the hex bleed screw at the rear of the solenoid until a continuous stream of solid, bubble-free oil escapes, then retighten immediately.