Duplomatic Oleodinamica Valves | PRM3-PT210 Relief Valve & DS3 Solenoid Valve

The Duplomatic PRM3 and DS3 Series premium industrial-grade high-pressure hydraulic manifold valves manufactured by Chengyuan Hydraulic are high-efficiency fluid power regulation and logic switching components precision-engineered to thoroughly match the technical specifications of Duplomatic Oleodinamica. This robust alternative matrix specifically addresses the rigorous requirements of automated plastic injection molding machinery, industrial press stations, CNC machine tool fixture blocks, and heavy integrated power units, featuring standard modular units such as the PRM3-PT210/10N/S (Size NG6 / Cetop 03 pilot-operated proportional relief valve) alongside the classic direct-acting directional solenoid valves DS3-TB/11V-D24K7/W7 (Three-position, dual-solenoid configuration with a mechanical detent mechanism) and DS3-TA/11N-SD24K1 (Two-position, single-solenoid spring-biased design with a concealed manual override).

Functioning as the reliable primary control heart within complex electro-hydraulic valve islands, branching actuators, and secondary pressure clamping segments, a valve’s pressure-current response linearity and spool centering alignment accuracy under full system loading govern total positioning repeat precision. Chengyuan guarantees 100% original-place drop-in interchangeability across all sub-assemblies regarding standard Cetop 03 / NG6 mounting subplate port layouts (ISO 4401-03 standard interfaces), DIN 43650 electrical connector sockets, micron-level spool-to-bore sliding fit clearances, and magnetic solenoid tractive force performance curves. Prior to factory shipping, every single valve component is subjected to 100% full-capacity simulated peak pressure switching, proportional scanning, and thermal coil current saturation tests on digital testing rigs, ensuring stable control under 35.0 MPa high-pressure loads.

Technical Specifications

• Compatible Original Brand: Duplomatic Oleodinamica (Universal Cetop 03 Modular Architecture)

• Target Replacement Configurations: PRM3-PT210/10N/S, DS3-TB/11V-D24K7/W7, DS3-TA/11N-SD24K1

• Nominal Interface Dimension Standard: Size 6 designation (NG6 / Cetop 03 / ISO 4401-03-02-0-05 pattern)

• Maximum Allowable Continuous Operating Pressure Threshold:

  • DS3 Directional Valve Ports P, A, B: 35.0 MPa (350 bar / 5,076 psi)

  • DS3 Directional Valve Port T (Tank Line Backpressure): 21.0 MPa (210 bar / 3,045 psi max. for DC coils)

  • PRM3 Proportional Relief System Limit: 25.0 MPa (250 bar / 3,625 psi)

• Maximum Regulated & Intermittent Flow Capacity:

  • DS3 Solenoid Shifting Matrix: Up to 100 L/min (26.4 USgpm), depending on chosen spool functionality.

  • PRM3 Proportional Main Stage: Up to 50 L/min (13.2 USgpm).

• Valve Actuation Mechanism & Function Configuration:

  • PRM3-PT210/10N/S: Proportional armature pilot control, pressure adjustment stage calibrated up to 21 MPa, utilizing external closed-loop cards.

  • DS3-TB Configuration: 3-position dual solenoid arrangement equipped with a mechanical detent holding mechanism.

  • DS3-TA Configuration: 2-position single solenoid spring-biased layout.

• Actuation Coil Electrical Core Specification: D24K7 signifies a heavy-duty 24V Direct Current (24V DC) solenoid core, paired with a square DIN 43650 junction socket. W7 defines a specialized high-corrosion environment protective exterior layer coating for mobile chassis.

• Valve Casing Metallurgy: High-tensile close-grained nodular cast iron body casting providing maximum anti-deformation rigid boundaries.

Key Technical Advantages:

• Low-Hysteresis High-Linearity Proportional Armature Control Assembly: The PRM3 series integrates a high-performance proportional solenoid core matched with precision-calibrated inner springs. This setup restricts total input-current to output-force hysteresis strictly below $\le 3\%$, translating to a highly smooth, linear scaling of the cracking relief pressure. This fulfills the exacting demands of automated servo press blocks.

• Five-Chamber Rigid Monoblock Flow-Optimized Valve Body Casting: The DS3 valve housing is manufactured using premium shell-mold casting techniques, shaping a broad five-chamber internal flow path layout. This spacious internal topology cuts fluid friction pressure drops ($\Delta p$) at high velocities, preventing casting distortion or micro-expansion under 35.0 MPa continuous cyclic peaks.

• Micron-Clearance Spool Processing via Match-Honing Techniques: The primary sliding spool is forged from premium low-carbon alloy steel, vacuum case-hardened to achieve HRC 58-62. The outer surface undergoes centerless cylindrical micro-grinding and mirror polishing, maintaining a precise one-sided radial clearance of 2 to 4 micrometers ($\mu m$) within the valve bore. This reduces internal bypass cross-leakage while ensuring smooth shifts under load.

• Oil-Immersed Wet-Pin Solenoid Architecture with Detachable Coil Design: The valve implements high-tractive wet-pin solenoids with threaded retaining sleeves. The internal armature operates fully immersed in the hydraulic fluid, which provides excellent heat dissipation, self-lubrication, and smooth damping. This configuration eliminates push-rod wear and external leakage, keeping average operational acoustics below 63 dB(A).

Application Areas:

• Heavy Automated Industrial Plastic Injection Molding Equipment: Regulating proportional multi-stage clamping/injection force lines and powering high-frequency ejector/core pulling directional valve manifolds.

• High-Precision Automated CNC Machine Tools & Fixture Stations: Managing directional flow for fast-acting workpiece chucking plates, automated sheet handlers, and high-frequency indexing turrets.

• Metallurgical Production Plants & Metal Sheet Forming Presses: Controlling micro-step cylinder movements on metal sheet bending rolls and managing multi-valve integrated pressure sectors.

Expert Maintenance Tips:

• Enforce Ultra-Clean Fluid Filtration Control to Prevent Proportional Orifice Jamming: This is critical for PRM3 proportional relief valves, which feature tiny internal pilot damping orifices and nozzle boundaries. System fluid cleanliness must be held strictly to ISO 4406 18/16/13 or cleaner, backed by a $\le 10$ micron pressure or return line filter element. Allowing degraded, contaminated fluid to circulate can jam fine metallic silt in the spool’s circular relief grooves, scoring the assembly or causing the spool to stick open.

• Enforce Strict Diagonal Torque Limits During Bolt-Down Subplate Installation: Because the radial clearance between the spool and the valve bore is only 2-4 microns, the assembly is highly sensitive to housing distortion. When securing the valve onto the subplate manifold, the 4 high-tensile M5 socket cap screws must be tightened progressively in a cross pattern to a torque limit of 7.5 – 8.5 Nm. Over-tightening with a standard hex wrench can warp the precision bore into an oval shape, causing the spool to bind up during operation.

• Verify Connector Seal Integrity and Coil Signal Stability During High-Duty Cycles: For the DS3-TB mechanical detent valve, the spool remains locked in its shifted position after a brief pulse signal. When operating in humid or fluid-sprayed shop environments, verify that the internal rubber sealing gasket of the DIN 43650 plug sits completely flat and dry. Moisture entering the plug housing can cause an electrical short, which can burn out the coil or damage the controller PLC output relays. Ensure proportional amplifiers supply a clean, low-ripple driving current.