DS3-S2/11N-D24K1 Duplomatic Solenoid Valve 100 L/min 350 Bar CETOP 3

Product Overview

The DS3-S2/11N-D24K1 (S2 spool, DC24V), DS3-S4/11N-A230K1 (S4 spool, AC230V), and DS5-S1/12N-D12K1 (S1 spool, DC12V) series solenoid directional valves are manufactured to original DUPLOMATIC technical standards, covering two frame sizes: DS3 (Size 03 / NG6 / CETOP 3 / ISO 4401-03) and DS5 (Size 05 / NG10 / CETOP 5 / ISO 4401-05). The DS3 series is a direct-acting subplate mounting directional control valve with maximum flow of 100 L/min (DS3-S2/S4); the DS5 series is a direct-acting subplate mounting directional control valve with maximum flow of 150 L/min, suitable for medium-to-high flow hydraulic systems.

The DS3-S2/11N-D24K1 features S2 spool type (4-way, 3-position, spring centered, center P→A / B→T) equipped with 24 VDC wet-pin DC solenoids, coil power 26 W, maximum operating pressure 350 bar (ports P/A/B), tank port rating 210 bar, and maximum flow of 80 L/min. The DS3-S4/11N-A230K1 features S4 spool type (4-way, 3-position, center all ports interconnected/floating) equipped with AC 230V 50/60Hz solenoids, apparent power approximately 55 VA (inrush) and 35 VA (holding), maximum operating pressure 350 bar, tank port rating 210 bar, and maximum flow of 80 L/min. The DS5-S1/12N-D12K1 features S1 spool type (4-way, 3-position, closed center) equipped with 12 VDC wet-pin solenoids, maximum operating pressure 320 bar (ports P/A/B), tank port rating 210 bar (DC version), and maximum flow of 150 L/min.

This series is dimensionally and functionally identical to the original DUPLOMATIC valves, with a mounting surface conforming to ISO 4401-03 (DS3 series) and ISO 4401-05 (DS5 series), offering true drop-in interchangeability for direct replacement of same-specification OEM valves. The DS3 series is dimensionally interchangeable with Vickers DG4V-3, Bosch Rexroth 4WE6, and Yuken DSG-01 valves at the same CETOP 3 frame size. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, directional response verification, internal leakage measurement, and solenoid response characterization.

Technical Specifications 

General Specifications

• Model: DS3-S2/11N-D24K1 / DS3-S4/11N-A230K1 / DS5-S1/12N-D12K1

• Product Series: DS3 (Size 03 / NG6 / CETOP 3 / ISO 4401-03); DS5 (Size 05 / NG10 / CETOP 5 / ISO 4401-05)

• Design Number: 11N / 12N

• Spool Type: S2 (4-way, 3-position, spring centered, center P→A / B→T); S4 (4-way, 3-position, spring centered, center all ports interconnected/floating); S1 (4-way, 3-position, spring centered, closed center)

• Design: Direct-acting subplate mounting solenoid directional valve with wet-pin solenoids

• Ways/Positions: 4-way, 3-position

• Mounting Pattern: DS3 per ISO 4401-03 (CETOP 3); DS5 per ISO 4401-05 (CETOP 5)

• Installation Position: Any (spring-centered/return types); RK type (mechanical detent) must be horizontal

Hydraulic Parameters (DS3 Series: DS3-S2 / DS3-S4)

• Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)

• Maximum Tank Port Pressure (Port T): 210 bar (3045 psi)

• Maximum Flow Rate: 80 L/min (DS3-S2/S4, AC/DC); 100 L/min (same series S1 spool)

• Hydraulic Fluid: Mineral-based hydraulic oil (HL, HLP) per ISO 6743-4

• Viscosity Range: 10 – 400 mm²/s (cSt), recommended 25 mm²/s

• Fluid Temperature Range: -20°C to +80°C

• Ambient Temperature Range: -20°C to +50°C

• Filtration: ISO 4406 20/18/15

• Seal Material: NBR (standard, code N) / FPM (optional, code V)

Hydraulic Parameters (DS5 Series: DS5-S1/12N-D12K1)

• Maximum Operating Pressure (Ports P/A/B): 320 bar (4640 psi)

• Maximum Tank Port Pressure (Port T): 210 bar (DC version) / 140 bar (AC version)

• Maximum Flow Rate: 150 L/min (DC version) / 120 L/min (AC version)

• Hydraulic Fluid: Mineral-based hydraulic oil (HL, HLP)

• Seal Material: NBR (standard) / FPM (optional)

• Weight: Single solenoid approx. 3.7 kg / Double solenoid approx. 4.6 kg

Electrical Parameters (DS3-S2/11N-D24K1)

• Supply Voltage: 24 VDC (D24)

• Coil Power: 26 W (DC)

• Electrical Connector: K1 (DIN 43650 standard connector)

• Response Time (Energizing): approx. 30~45 ms

• Response Time (De-energizing): approx. 20~30 ms

• Protection Class: IP65 (with standard connector)

• Duty Cycle: Continuous (ED = 100%)

• Weight: Single solenoid approx. 1.5 kg / Double solenoid approx. 1.4 kg

Electrical Parameters (DS3-S4/11N-A230K1)

• Supply Voltage: AC 230V 50/60Hz (A230)

• Apparent Power (Inrush): approx. 55 VA

• Apparent Power (Holding): approx. 35 VA

• Electrical Connector: K1 (DIN 43650 standard connector)

• Response Time (Energizing): approx. 35~50 ms

• Response Time (De-energizing): approx. 20~30 ms

• Protection Class: IP65

• Weight: approx. 1.8 kg (AC coil slightly heavier than DC)

Electrical Parameters (DS5-S1/12N-D12K1)

• Supply Voltage: 12 VDC (D12)

• Electrical Connector: K1 (DIN 43650 standard connector)

• Protection Class: IP65

• Duty Cycle: Continuous (ED = 100%)

Materials & Construction

• Valve Body: High-strength cast iron with wide internal passages to minimize pressure drop

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard) / FPM (optional, for HFDR fluids)

• Solenoid Type: Wet-pin solenoids with interchangeable coils; DC coils can be fed with AC power supply via connectors with built-in rectifier bridge

• Interchangeable Spools: Wide range of interchangeable spools available for different circuit requirements

Key Technical Advantages

1. Wet-Pin Solenoid with Interchangeable Coil Design
The DS3/DS5 series employs wet-pin solenoid design with the armature operating in hydraulic fluid, effectively reducing shifting impact noise and wear. The coil is secured to the core tube by a threaded ring and can be rotated to suit available installation space. Solenoid coils can be changed quickly without leakage from the hydraulic system, significantly reducing downtime and maintenance costs. DC coils can be fed with AC power supply by using connectors with a built-in rectifier bridge, significantly simplifying spare parts management and system maintenance.

2. High-Strength Cast Iron Body with Optimized Flow Passages
The valve body is made of high-strength cast iron with CFD-optimized internal flow passages and maximized flow area, effectively reducing pressure loss. The DS3 series achieves 80-100 L/min flow capacity in NG6, while the DS5 series achieves 120-150 L/min in NG10, combined with maximum operating pressure of 350 bar (DS3) and 320 bar (DS5), delivering exceptional hydraulic control performance in a compact installation envelope.

3. Multiple Spool Options for Flexible Circuit Design
The series offers multiple interchangeable spool functions: S1 (closed center), S2 (center P→A / B→T), S3 (A/B to tank in center), S4 (all ports interconnected/floating in center), TA (all ports open in center), and others. The DS3 series also offers RK type (mechanical detent, no spring), which must be installed horizontally. The multiple function combinations meet diverse hydraulic circuit design requirements, from simple directional switching to center unloading, differential circuits, and floating circuits.

4. High-Reliability Electrical System for Industrial Field Adaptability
The DS3 series offers DC and AC solenoid options, and the DS5 series similarly offers complete DC/AC options. Coil insulation is high with continuous duty cycle (ED = 100%) support. The DS5 series offers optional special versions including Y-port external drain, soft-shifting, and adjustable soft-shifting for enhanced system adaptability and control quality. The DS3 series offers optional high IP protection and corrosion resistance versions, as well as UL Recognized coil versions, suitable for demanding industrial environments.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every valve undergoes 100% bench testing prior to shipment, covering 350 bar (DS3) / 320 bar (DS5) rated pressure holding, directional response time measurement, internal leakage verification, and solenoid response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original DUPLOMATIC valves, with a mounting surface conforming to ISO 4401, enabling direct drop-in replacement without modifying piping or control programs. The DS3 series is dimensionally interchangeable with Vickers DG4V-3, Rexroth 4WE6, and Yuken DSG-01 valves at the same CETOP 3 frame size.

Application Areas

• Industrial Hydraulic Systems: Directional control for general industrial hydraulic applications including presses and clamping systems

• Machine Tools: CNC hydraulic clamping systems, tool changer control

• Injection Molding Machines: Mold opening/closing direction control, ejector system control

• Metallurgical Equipment: Continuous casting machines, rolling mill auxiliary directional control

• Mining Equipment: Hydraulic support direction control, drilling rig feed circuits

• Marine Hydraulics: Steering gear control, deck machinery hydraulic systems

• Testing Equipment: Material testing machine hydraulic loading direction control

• Mobile Hydraulic Equipment: DS5 series for medium-to-high flow mobile hydraulic systems

Expert Maintenance Tips

Installation Guidelines

1. The DS3/DS5 series can be mounted in any position (spring-centered types); the RK type (mechanical detent, no spring) must be installed horizontally. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-03 (DS3) and ISO 4401-05 (DS5) for direct installation on standard subplates or manifolds.

2. Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes. Recommended fluid cleanliness is ISO 4406 20/18/15 or better.

3. Electrical connections must use a K1 connector conforming to DIN 43650 to maintain IP65 protection. The valve is supplied without a plug; the plug must be ordered separately. Control signal cables should be shielded, with the shield grounded at one end.

4. Tank Port Back Pressure Management: DS3 series tank port maximum pressure is 210 bar (DC) / 160 bar (AC); DS5 series DC version tank port maximum pressure is 210 bar, AC version 140 bar. If system return back pressure is high, inspect the return line for blockage or undersized piping.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 20/18/15 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits. When operating fluid temperature exceeds 80°C, hydraulic fluid and seals will age and deteriorate rapidly; maintain stable physical and chemical properties of the hydraulic fluid.

2. Solenoid Electrical Inspection: Periodically inspect connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. DS3-S2/11N-D24K1 coil power is 26 W; DS3-S4/11N-A230K1 apparent power is approx. 55 VA (inrush) and 35 VA (holding). Monitor for abnormal temperature rise.

3. Shifting Performance Verification: Periodically check each position for smooth shifting and absence of binding. If shifting response becomes sluggish or internal leakage increases, inspect spool wear and fluid contamination levels.

4. Seal Replacement: Standard NBR seals compatible with mineral-based hydraulic fluids (HL, HLP). For HFDR phosphate ester hydraulic fluids, FPM seals (code V) are required. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.

5. Installation Orientation Maintenance: Spring-centered and spring-return valves can be mounted in any position; RK type (mechanical detent, no spring) must be installed with the longitudinal axis horizontal. If inspecting or reinstalling RK type valves, ensure the installation orientation meets requirements.