DS3-S1/11N-D24K1 Duplomatic Solenoid Valve 100 L/min 350 Bar CETOP 3

Product Overview

The DS3 series solenoid directional valve (including models DS3-S1/11N-D24K1, DS3-TA/SD24K, and DS3-S4/11N-SD24K1) is manufactured to original DUPLOMATIC technical standards. Belonging to the DS3 series with size 03 (NG6 / CETOP 3 / ISO 4401-03 / NFPA D03), this valve is a direct-acting subplate mounting directional control valve. Featuring a wet-pin solenoid directly driving the spool in a spool valve design, the valve body is made of high-strength cast iron with wide internal passages to minimize pressure drop, used for precise control of fluid direction and flow in hydraulic systems.

The DS3-S1/11N-D24K1 features S1 spool type (4-way, 3-position, spring centered, closed center) 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 100 L/min. The DS3-TA/SD24K features TA spool type (4-way, 2-position, all ports closed in center, suitable for holding and cylinder locking applications) equipped with 24 VDC solenoids. The DS3-S4/11N-SD24K1 features S4 spool type (4-way, 3-position, spring centered, all ports interconnected/floating in center) equipped with 24 VDC solenoids and zero overlap spool design.

This series is dimensionally and functionally identical to the original DUPLOMATIC valves, with a mounting surface conforming to ISO 4401-03 (CETOP RP121H), 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-S1/11N-D24K1 / DS3-TA/SD24K / DS3-S4/11N-SD24K1

• Product Series: DS3 (Size 03 / NG6 / CETOP 3 / ISO 4401-03 / NFPA D03)

• Design Number: 11N

• Spool Type: S1 (4-way, 3-position, spring centered, closed center) / TA (4-way, 2-position, closed center) / S4 (4-way, 3-position, spring centered, all ports floating in center)

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

• Ways/Positions: 4-way 3-position (S1/S4) / 4-way 2-position (TA)

• Mounting Pattern: ISO 4401-03 (CETOP RP121H-4.2-4-05) / NFPA D03

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

Hydraulic Parameters

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

• Maximum Tank Port Pressure (Port T): 210 bar (CC version) / 160 bar (CA version)

• Maximum Flow Rate: 100 L/min (DS3-S1/S4/TA)

• 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)

Electrical Parameters (DS3-S1/11N-D24K1)

• Supply Voltage: 24 VDC (D24)

• Coil Power: 26 W (DC)

• Electrical Connector: K1 (DIN 43650 standard connector)

• Protection Class: IP65

• Duty Cycle: Continuous (ED = 100%)

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

Electrical Parameters (DS3-TA/SD24K)

• Supply Voltage: 24 VDC (SD24K)

• Solenoid Type: Wet-pin solenoid with interchangeable coil

• Electrical Connector: DIN 43650 standard connector

• Protection Class: IP65

• Duty Cycle: Continuous (ED = 100%)

• Weight: approx. 1.5 kg

Electrical Parameters (DS3-S4/11N-SD24K1)

• Supply Voltage: 24 VDC (19 to 30 VDC), ripple max. 3 Vpp

• Power Consumption: 25 VA

• Maximum Solenoid Current: 1.88 A

• Fuse Protection: External 3A

• Spool Nominal Flow: 30 L/min

• Electrical Connector: 6-pin + PE

• Protection Class: IP65 / IP67 (per EN 60529)

• Duty Cycle: Continuous (ED = 100%)

• Weight: approx. 1.8 kg

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

Key Technical Advantages

1. Wet-Pin Solenoid with Interchangeable Coil Design
The DS3 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 optimized internal flow passages and maximized flow area, effectively reducing pressure loss. The DS3 series achieves 100 L/min flow capacity in NG6, combined with maximum operating pressure of 350 bar, 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 (closed center, holding/cylinder locking), TA23 (4-way 2-position, closed 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, floating circuits, and holding circuits.

4. High-Reliability Electrical System for Industrial Field Adaptability
The DS3 series offers DC and AC solenoid options; DC solenoids can also be fed with AC power supply (requiring a connector with a built-in rectifier bridge). Coil insulation is high with continuous duty cycle (ED = 100%) support. The DS3 series offers optional UL Recognized coil versions and corrosion-resistant versions (IP protection) for demanding industrial environments. Standard manual override is provided; optional lever, push override, boot, and mechanical detent devices are available for greater safety.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every valve undergoes 100% bench testing prior to shipment, covering 350 bar 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 4401-03, 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

• Holding/Cylinder Locking Applications: DS3-TA type suitable for hydraulic circuits requiring holding and cylinder locking

Expert Maintenance Tips

Installation Guidelines

1. For the DS3 series, spring-centered models (S1/S4) can be mounted in any position; RK type (mechanical detent, no spring) must be installed with the longitudinal axis horizontal. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value (5 Nm). The mounting surface conforms to ISO 4401-03 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 (CC version) / 160 bar (CA version). 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-S1/11N-D24K1 coil power is 26 W; DS3-S4/11N-SD24K1 power consumption is 25 VA with maximum solenoid current of 1.88 A. 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.