SDKE-1631/2 10S | ATOS Solenoid Valve 350bar 150L/min NG10

Product Overview

The SDKE-1631/2 10S, SDKE-1631/2/A 10S, SDKE-1710 10S, SDKE-1711 10S, SDKE-1713 10S, and SDKE-1714 10S are core models in the ATOS SDKE series of direct-operated solenoid directional valves. ATOS is a globally recognized Italian hydraulic component manufacturer, with the SDKE series widely used in industrial automation, construction machinery, and various hydraulic equipment.

The SDKE series features direct-operated spool-type solenoid directional valves in ISO 4401 size 10 (NG10) . The valve body features a 3-chamber shell-moulded casting design with wide internal passages ensuring low pressure drops. The spool type is available in two or three positions. The solenoids feature wet type screwed tube design with integrated manual override pin.

Model Code Breakdown (using SDKE-1631/2 10S as an example):

• SDKE: Direct Operated Solenoid Directional Valve Series

• 1: Directional control valve, size 10

• 61: Valve configuration (61=single solenoid, spring centered, center plus external position; 71=double solenoid, 3 positions, spring centered; 70=double solenoid, 2 positions, without springs)

• 31: Spool type code

• /2: Spool function/configuration code

• A: Seal material code (A=FKM seals)

• 10S: Size code — 10 size (NG10), S=standard manual override

Configuration by Model:

• SDKE-1631/2 10S: 4-way, 3-position, double solenoid spring centered, standard NBR seals, 24V DC

• SDKE-1631/2/A 10S: 4-way, 3-position, double solenoid spring centered, FKM seals (/A suffix)

• SDKE-1710 10S: 4-way, 2-position, double solenoid detent (no springs)

• SDKE-1711 10S: 4-way, 3-position, double solenoid spring centered

• SDKE-1713 10S: 4-way, 3-position, double solenoid spring centered

• SDKE-1714 10S: 4-way, 3-position, double solenoid spring centered

As original ATOS direct-operated solenoid directional valves, these products offer complete interchangeability within the same series and size, requiring no modifications to mounting interfaces or piping layouts.

Technical Specifications 

SDKE Series Common Specifications:

• Brand: ATOS (Italy)

• Series: SDKE Series

• Product Type: Direct Operated Solenoid Directional Valve

• Spool Type: Spool Type

• Mounting Standard: ISO 4401 Size 10 (NG10)

• Maximum Operating Pressure P/A/B: 350 bar (35 MPa) 

• Maximum T Port Pressure: 210 bar for DC (250 bar with option M) / 160 bar for AC

• Maximum Flow Rate: 150 L/min

• Protection Class: IP65 (standard coils)

• Optional Protection: IP67 (AMP Junior Timer, Deutsch connector options)

• Insulation Class: DC coils Class H (180°C) / AC coils Class F (155°C) 

• Duty Rating: 100% ED (Continuous) 

• Ambient Temperature: Standard -30°C to +70°C

• Seal Material: NBR (standard) / FKM (/A option) / HNBR (/BT option)

• Recommended Fluid Temp: NBR -20°C to +80°C / FKM -20°C to +80°C / HNBR -40°C to +60°C

• Recommended Viscosity: 15–100 mm²/s (max range 2.8–500 mm²/s)

• Recommended Cleanliness: ISO 4406 20/18/15 (NAS 1638 Class 9)

• MTTFd: 150 years (per EN ISO 13849)

• Assembly Position: Any position (except 170* springless types)

• Manual Override: Standard integrated manual override pin

• Weight: Approx. 5.5–6.1 kg (configuration dependent)

Key Technical Advantages

1. Direct-Operated Design for Fast Response

The SDKE series features direct-operated spool construction—the solenoid directly actuates the spool with no pilot stage delay. Compared to pilot-operated valves, the direct-operated design delivers faster response and higher reliability. DC switching time: 30–50 ms (on) / 15–25 ms (off). AC switching time: 10–25 ms (on) / 20–40 ms (off).

2. 350 bar High Pressure and 150 L/min High Flow Capacity

Delivers 350 bar (35 MPa) maximum operating pressure and 150 L/min flow capacity in a compact NG10 valve body. Tank port allowable back pressure reaches 210 bar (DC) or 160 bar (AC) . This performance places it at the forefront of direct-operated solenoid directional valves in its class.

3. Wet-Type Solenoid Design for Quiet, Long-Life Operation

The SDKE series features wet type screwed tube solenoid design—the movable iron core operates fully submerged in hydraulic oil. The hydraulic oil lubricates moving parts to reduce wear and cushions switching impact and vibration. Compared to dry-type designs, the wet-type configuration delivers lower noise, longer service life, and higher reliability.

4. Flexible Coil and Seal Options

The SDKE series offers both AC and DC power supply options, with DC coils or AC coils interchangeable without tools. Multiple seal options: NBR (standard), FKM (/A option, fluoroelastomer for heat and chemical resistance), HNBR (/BT option, low-temperature resistance). cURus certified coils available.

5. Extensive Spool Configurations and Options

The SDKE series offers multiple spool types and spring configurations:

• 61: Single solenoid, spring centered, center plus external position

• 63: Single solenoid, 2 external positions, spring offset

• 67: Single solenoid, center plus external position, spring offset

• 70: Double solenoid, 2 external positions, without springs

• 71: Double solenoid, 3 positions, spring centered

• 75: Double solenoid, 2 external positions, with detent

6. International Standard Compliance for Global Interchangeability

Mounting conforms to ISO 4401 Size 10 international standards. Fully compatible with globally adopted NG10 size interfaces for direct replacement of same-series, same-specification products. Coil protection class IP65 with optional IP67 connectors. cURus North American certification available.

Application Areas

• Injection Molding Machinery — High-flow directional control for clamping, injection, and ejection cylinders

• CNC Machine Tools — Directional control for machine tool hydraulic systems

• Hydraulic Presses and Forging Equipment — High-flow directional control for presses and forming equipment

• Die-Casting Machines — High-flow directional control for high-pressure casting equipment

• Construction Machinery — High-flow hydraulic directional control for excavators, loaders, and mobile equipment

• Industrial Automation Production Lines — Hydraulic actuator control for automated production lines

• Steel and Mining Equipment — High-flow directional control for rolling mills and heavy-duty systems

Expert Maintenance Tips

1. Installation Guidelines

• SDKE series mounting must conform to ISO 4401 Size 10 standards.

• Use 4 M5×30 mounting bolts, strength class 12.9, tightening torque 8 N·m.

• Subplate surface finishing: Roughness Ra 0.4, flatness 0.01/100 (ISO 1101) .

• Thoroughly clean the mounting surface and all ports (P, A, B, T) before installation to prevent foreign particles from entering and causing spool sticking or seal damage.

2. Hydraulic Fluid Cleanliness

• Recommended fluid cleanliness: ISO 4406 20/18/15 (NAS 1638 Class 9).

• Compatible fluids: HL, HLP, HLPD, HVLP, HVLPD (mineral oils); HFDU, HFDR (water-free fire-resistant fluids); HFC (water-containing fire-resistant fluids).

• Recommended viscosity: 15–100 mm²/s (max range 2.8–500 mm²/s).

• Install a return line filter with minimum 10 μm filtration rating.

3. Electrical Connection Specifications

• SDKE-1631/2 10S and SDKE-1631/2/A 10S use 24V DC supply with power consumption of 28–31 W.

• Voltage for SDKE-1710/1711/1713/1714 10S varies by configuration—verify coil nameplate voltage matches supply voltage before connection.

• Standard coil connector: DIN 43650 with IP65 protection.

• Optional connectors: AMP Junior Timer (IP67) , Deutsch (IP67) , lead wire.

• Ensure the connector is fully locked to maintain protection class.

4. Manual Override

• SDKE series features standard integrated manual override pin.

• Manual override operation is only possible when T port pressure is below 50 bar.

• Manual operation is for emergency use only and is not recommended for continuous duty.

5. Seal Material Selection

• NBR (no suffix): Standard seals for mineral oils, temperature range -20°C to +80°C.

• FKM (/A suffix): Fluoroelastomer seals for mineral oils and water-free fire-resistant fluids, heat and chemical resistant.

• HNBR (/BT suffix): Hydrogenated nitrile seals for mineral oils and water-containing fire-resistant fluids, low-temperature resistant to -40°C.

6. Periodic Maintenance Inspection

• Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.

• Check electrical connectors for looseness, oxidation, or moisture ingress.

• If response lag or unstable shifting is observed, first check system fluid cleanliness and verify the spool is not sticking.

• SDKE series coils can be replaced quickly without disturbing hydraulic connections.