Duplomatic DS3 DS5 Directional Valve DS3-S1 DS5-S2 Solenoid Valve

The industrial-grade Duplomatic Compatible DS3 and DS5 Series High-Pressure Solenoid Operated Directional Control Valves, engineered by Chengyuan Hydraulic, are premium subplate-mounted fluid power components designed for directional stream control across multi-stage automation hydraulic networks. As universally acknowledged benchmarks for directional valve design, the DS3 series (Nominal Size $6\text{ mm}$ / NG6 / CETOP 03) and the DS5 series (Nominal Size $10\text{ mm}$ / NG10 / CETOP 05) are deployed in CNC metal-cutting machining centers, plastic injection moulding equipment, high-tonnage industrial presses, metallurgical plant automation, and centralized integrated manifold systems.

This high-performance valve portfolio targets the global B2B industrial component aftermarket supply chain, delivering 100% direct drop-in interchangeability with authentic Duplomatic standard engineering reference codes, including: DS3-S1/11N-D24K1, DS5-S2/12N-D24K1, DS5-SA2/14N-D24K1, and the heavy-duty configuration DS5-S9/14N-D220K1/F.

Chengyuan’s alternative valve program is engineered in full compliance with international ISO 4401 mounting standards. Every mechanical and operational interface—including the 4-bolt subplate footprint layout, electrical coil power draw metrics, internal spool overlapping zones, channel volumetric flow cavities, and seal ring seat geometries—perfectly mirrors native Duplomatic technical manual specifications. On automated industrial lines or complex manufacturing cells, field maintenance engineers can execute rapid replacements immediately upon unboxing, without re-routing hydraulic rigid pipe lines or modifying PLC digital output wiring connectors.

In continuous-duty production environments, directional valves undergo tens of millions of continuous, high-frequency cycles. Shifting fluid waves trigger local hydraulic locking risks, fine-particle micro-abrasion, and aggressive back-pressure waves against the internal armature tube, which are primary failure vectors causing spool stickiness, rapid internal leakage, or coil burnouts. To eliminate these operational vulnerabilities, 100% of Chengyuan’s DS3 / DS5 alternative valves undergo 100% strict dynamic simulation testing on digitized load blocks. Verified at peak pressures and maximum continuous volumetric flows, each unit is certified for millisecond-level spool response lag, minimized center-position cross-port leakage, and high thermal durability to guarantee long-term operational precision under extreme workloads.

Technical Specifications

• Product Classification: Subplate Mounted, Direct-Acting Directional Spool Valve with Solenoid Operation

• Compatible Reference Platform Series: Seamless adaptation for Duplomatic DS3 and DS5 product generations, spanning 11N, 12N, and 14N heavy-duty technical platforms

• Nominal Sizing Footprint & Standard Compliances:

  • DS3 Product Line: Size $6\text{ mm}$ (fully compliant with ISO 4401-03-02-0-05 / CETOP 03 subplate interfaces)

  • DS5 Product Line: Size $10\text{ mm}$ (fully compliant with ISO 4401-05-04-0-05 / CETOP 05 subplate interfaces)

• Maximum Permissible Circuit Pressure Ratings:

  • DS3 Series: Main working ports P, A, and B accommodate up to $350\text{ bar}$ ($35\text{ MPa}$); return tank T-port maximum back-pressure rating is $210\text{ bar}$ under DC voltage operation.

  • DS5 Series: Main working ports P, A, and B accommodate up to $320\text{ bar}$ ($32\text{ MPa}$); return tank T-port maximum back-pressure rating is $210\text{ bar}$ under DC voltage operation.

• Maximum Continuous Flow Capacities:

  • DS3 Series: Volumetric continuous stream capacity delivers up to $100\text{ L/min}$ (26.4 GPM)

  • DS5 Series: Volumetric continuous stream capacity delivers up to $150\text{ L/min}$ (39.6 GPM)

• Technical Model Coding Decoupling & Parsing:

  • Replacement Reference: DS3-S1/11N-D24K1

    • Configuration: Size $6\text{ mm}$ valve; “S1” specifies a 3-position 4-way layout with a standard spring-centered closed center spool (all ports isolated in neutral); “11N” signifies the 11th product design revision using standard Nitrile NBR seals; “D24” denotes a wet-pin DC $24\text{V}$ coil; “K1” represents the standard square DIN 43650 Hirschmann electrical junction interface plug.

  • Replacement Reference: DS5-S2/12N-D24K1

    • Configuration: Size $10\text{ mm}$ high-flow valve; “S2” specifies a 3-position 4-way open center spool profile (all ports P, A, B, T interconnected in neutral); “12N” marks the 12th design series platform; equipped with a heavy-duty DC $24\text{V}$ wet-pin solenoid and K1 DIN interface.

  • Replacement Reference: DS5-SA2/14N-D24K1

    • Configuration: Size $10\text{ mm}$ 2-position 4-way valve; “SA2” defines a single-solenoid configuration with spring offset return mechanism; “14N” represents the optimized 14th technical design generation; driven by a DC $24\text{V}$ coil assembly.

  • Replacement Reference: DS5-S9/14N-D220K1/F

    • Configuration: Size $10\text{ mm}$ 3-position 4-way valve; “S9” indicates a specialized asymmetric or custom metering transitional spool profile; “D220” specifies a high-voltage DC $220\text{V}$ wet-pin armature tube providing extreme electromagnetic magnetic thrust; “/F” designates an integrated soft-shifting throttle element or a manual override protection shroud, protecting the valve block from sudden fluid kinetic shocks.

• System Fluid Compatibility & Thermal Limits: Accommodates mineral-based hydraulic fluids (compliant with HLP anti-wear standards), spanning fluid operational temperatures from $-20^\circ\text{C}$ to $+80^\circ\text{C}$

• Average Component Weight: DS3 series ranges from approx. $1.5\text{ kg}$ (single solenoid) to $2.0\text{ kg}$ (double solenoid); DS5 series ranges from approx. $3.8\text{ kg}$ (single solenoid) to $4.8\text{ kg}$ (double solenoid).

Key Technical Advantages

• Five-Chamber Low-Pressure-Drop Hydrodynamic Cast Body: The primary valve housing is poured from high-rigidity ductile iron using a refined 5-chamber shell-molding casting structure. This expansive internal layout optimizes fluid vector transitions, reducing local throttling resistance and pressure drop by 15% under maximum flow conditions to effectively minimize system heat generation.

• CNC Super-Finished Spools with Optimized Metering Notches: The reciprocating control spools are turned from premium alloy steel, induction-quenched for superior wear resistance (58-62 HRC), and micro-ground to sub-micron accuracy. Integrated fluid metering notches ensure highly linear flow transitions and mitigate shock waves, while holding radial match clearances to single-digit microns to significantly outperform standard alternatives in volumetric sealing.

• Wet-Pin Heavy-Duty Removable Solenoid Armature System: The moving armatures operate entirely submerged in the system’s hydraulic return fluid (T-line), utilizing the fluid volume to naturally cushion high-frequency mechanical impacts and minimize audible shifting noise. The heavy-duty coil housings can be rotated $360^\circ$ and hot-swapped without fluid leakage or line depressurization, reducing field repair times.

• Anti-Lock Radial Pressure Balancing Grooves: The cylindrical contact lands of the spool feature precision-machined, equidistant ring-shaped micro-grooves. These micro-grooves establish a perfectly uniform radial oil-film pressure field around the sliding spool, neutralizing side-loading hydraulic lock forces and ensuring rapid, effortless shifting even during prolonged high-pressure holding states.

Application Areas

Chengyuan’s high-grade replacement Duplomatic DS3 and DS5 series solenoid valves provide reliable fluid direction and control across critical machinery platforms:

• High-Precision CNC Metal Cutting Machining Centers & Lathes: Governing primary spindle speed variations, automated part clamping mechanisms, and rapid index turret cylinder positioning loops.

• Heavy-Duty Plastic Injection & Blow Moulding Machinery: Precision-managing auxiliary hydraulic manifold blocks, automated mold toggle clamping arrays, and material ejector stroke profiles.

• Central Industrial Hydraulic Power Units (HPUs) & Manifold Top-Covers: Deployed as highly responsive pilot-stage actuators to govern high-volume proportional or two-way cartridge logic valves.

Expert Maintenance Tips

• Mount the DS3/DS5 Valve Onto Its Subplate Interface Using an Alternate Cross-Pattern Sequence and a Calibrated Torque Wrench: Tighten DS3 mounting bolts (M5) strictly to $5\sim6 \text{ N}\cdot\text{m}$, and DS5 mounting bolts (M6) strictly to $12\sim14 \text{ N}\cdot\text{m}$. Because internal spool-to-bore clearances are held to single microns, uneven bolt clamping forces will distort the iron housing. This results in severe spool binding, sluggish shifting, and potential thermal lockup under normal operating temperatures.

• For Configurations Utilizing High-Voltage DC Solenoids (e.g., D220K1), Continuously Monitor the Shifting T-Port Back-Pressure Waves: While the wet DC solenoids accommodate return line back-pressures up to $210\text{ bar}$, excessive back-pressure creates resistive fluid forces against the armature. If particulate contamination or high-pressure spikes prevent the armature from completing its physical stroke, the coil will draw excess continuous current, leading to localized overheating and thermal breakdown within minutes.

• Never Apply Thick Mechanical Grease or Automotive Valvoline to the Subplate O-Ring Seals to Keep Them in Place During Assembly: Technicians often use heavy grease to adhere the four or five interface O-rings into their seating grooves. However, this dense grease is squeezed into the micro-scale metering zones and spool gaps upon bolt torquing. It acts as an adhesive paste that traps fine wear particulates, forming an abrasive slurry that will score the spool and cause structural hydraulic locking. Use clean hydraulic oil as a natural adhesive during assembly.