SS-G01 Series (NG6 / CETOP 3) Common Specifications
Brand: NACHI (Nach-Fujikoshi)
Series: SS Series, Wet-Type Solenoid Valve (Central Terminal Box Type)
Nominal Size: G01 (NG6 / 1/8 inch port)
Mounting Standard: ISO 4401-03 / CETOP 3
Mounting Type: Gasket Mount
Maximum Operating Pressure: 35 MPa (350 kgf/cm²)
Allowable Back Pressure: 21 MPa (214 kgf/cm²)
Maximum Shifting Frequency: 300 cycles/min
Protection Class: JIS C 0920 IP64
Fluid Temperature Range: -20°C to +70°C
Ambient Temperature Range: -20°C to +50°C
Viscosity Range: 15–300 mm²/s
Recommended Filtration: 25 μm or less
Solenoid Type: Wet-Type (Oil-Immersed Armature)
Certifications: CE (Europe), UL (USA), CSA (Canada)
SS-G01-C6-R-C2-31
Product Overview
The SS-G01-C6-R-C2-31 is a classic model in the NACHI SS series of wet-type solenoid directional valves, G01 size (NG6), with mounting pattern conforming to ISO 4401-03 / CETOP 3. This 4-way, 3-position solenoid directional valve features spring centered configuration with C6 spool type — all ports fully closed in neutral (closed center). It features a central terminal box with COM terminal and indicator light as standard equipment for easy wiring. The coil is plug-in type for one-touch replacement.
The SS series wet solenoid valves are certified to CE (Europe), UL (USA), and CSA (Canada) international safety standards, ensuring safe use worldwide. The product offers wide-ranging compatibility for easy installation on conventional valves, and when combined with modular valves, contributes to a more compact overall device configuration.
Model Code Breakdown (SS-G01-C6-R-C2-31):
SS: Wet-Type Solenoid Valve (Central Terminal Box Type)
G01: G01 Size (NG6 / CETOP 3)
C6: Spool Type (4-way, 3-position, spring centered, all ports blocked)
R: Auxiliary Symbol — with Indicator Light
C2: Power Supply — AC200V (50/60Hz common)
31: Design Series Number
Technical Specifications
Model: SS-G01-C6-R-C2-31
Spool Configuration: 4-way, 3-position
Spring Arrangement: Spring Centered
Center Position: All ports blocked (closed center)
Maximum Operating Pressure: 35 MPa
Maximum Flow Rate: 65 L/min
Allowable Back Pressure: 21 MPa
Maximum Shifting Frequency: 300 cycles/min
Coil Voltage: AC200V (50/60Hz)
Starting Current: 50Hz: 1.1A / 60Hz: 1.0A
Holding Current: 50Hz: 0.26A / 60Hz: 0.19A
Holding Power: 50Hz: 25W / 60Hz: 22W
Permissible Voltage Range: 50Hz: 160–220V / 60Hz: 180–240V
Protection Class: JIS C 0920 IP64
Port Connection: 1/8 inch
Weight: 1.8 kg
SS-G01-E3X-R-C2-31
Product Overview
The SS-G01-E3X-R-C2-31 is a classic model in the NACHI SS series of wet-type solenoid directional valves, G01 size (NG6), with mounting pattern conforming to ISO 4401-03 / CETOP 3. This 4-way, 3-position solenoid directional valve features detent (no-spring) configuration— the spool locks in position after solenoid actuation, maintaining the position even when de-energized. Maximum flow rate reaches 100 L/min.
Model Code Breakdown (SS-G01-E3X-R-C2-31):
SS: Wet-Type Solenoid Valve (Central Terminal Box Type)
G01: G01 Size (NG6 / CETOP 3)
E3X: Spool Type (4-way, 3-position, detent)
R: Auxiliary Symbol — with Indicator Light
C2: Power Supply — AC200V (50/60Hz common)
31: Design Series Number
Technical Specifications
Model: SS-G01-E3X-R-C2-31
Spool Configuration: 4-way, 3-position
Spring Arrangement: Detent (No-Spring)
Transition Flow Path: Closed
Maximum Operating Pressure: 35 MPa
Maximum Flow Rate: 100 L/min
Coil Voltage: AC200V (50/60Hz)
Protection Class: JIS C 0920 IP64
SS-G01-A3X-R-C1-30
Product Overview
The SS-G01-A3X-R-C1-30 is a classic model in the NACHI SS series of wet-type solenoid directional valves, G01 size (NG6), with mounting pattern conforming to ISO 4401-03 / CETOP 3. This 4-way, 3-position solenoid directional valve features spring centered configuration with maximum flow rate of 100 L/min. This model operates on AC100V supply and is part of the 30 Design Series.
Model Code Breakdown (SS-G01-A3X-R-C1-30):
SS: Wet-Type Solenoid Valve (Central Terminal Box Type)
G01: G01 Size (NG6 / CETOP 3)
A3X: Spool Type (4-way, 3-position, spring centered)
R: Auxiliary Symbol — with Indicator Light
C1: Power Supply — AC100V (50/60Hz common)
30: Design Series Number
Technical Specifications
Model: SS-G01-A3X-R-C1-30
Spool Configuration: 4-way, 3-position
Spring Arrangement: Spring Centered
Maximum Operating Pressure: 35 MPa
Maximum Flow Rate: 100 L/min
Coil Voltage: AC100V (50/60Hz)
Design Series: 30 Series
Protection Class: JIS C 0920 IP64
SS-G03-C5-R-C2-21
Product Overview
The SS-G03-C5-R-C2-21 is a high-flow model in the NACHI SS series of wet-type solenoid directional valves, G03 size (NG10 / CETOP 5), with mounting pattern conforming to ISO 4401-05. This 4-way, 3-position solenoid directional valve features spring centered configuration with C5 spool type — P port blocked, A & B ports open to T in neutral. Maximum flow reaches 160 L/min (DC) / 130 L/min (AC) . This model operates on AC200V supply and is part of the 21 Design Series.
Model Code Breakdown (SS-G03-C5-R-C2-21):
SS: Wet-Type Solenoid Valve (Central Terminal Box Type)
G03: G03 Size (NG10 / CETOP 5)
C5: Spool Type (4-way, 3-position, spring centered)
R: Auxiliary Symbol — with Indicator Light
C2: Power Supply — AC200V (50/60Hz common)
21: Design Series Number
Technical Specifications
Model: SS-G03-C5-R-C2-21
Spool Configuration: 4-way, 3-position
Spring Arrangement: Spring Centered
Maximum Operating Pressure: 35 MPa
Maximum Flow Rate: 160 L/min (DC) / 130 L/min (AC)
Allowable Back Pressure: 16 MPa
Coil Voltage: AC200V (50/60Hz)
Protection Class: JIS C 0920 IP64
Weight: Single Solenoid: 3.5–4.1 kg / Double Solenoid: 4.2–5.5 kg
Key Technical Advantages (SS Series Common)
1. Wet-Type Solenoid Design for Quiet, Long-Life Operation
The SS series features wet-type (oil-immersed) solenoid construction — the movable iron core operates fully submerged in hydraulic oil, providing lubrication to reduce wear and cushioning against switching impact and vibration. The wet-type solenoid ensures extremely low switching noise and very quiet operation. Minimal wear ensures long service life, suitable for demanding high-cycle applications.
2. Fluid Reaction Compensating Mechanism for Reliable Switching
The SS series employs an innovative fluid reaction compensating mechanism, effectively compensating for flow forces under high-pressure, high-flow conditions to ensure highly reliable valve switching. This achieves class-leading high capacity with minimal pressure loss.
3. Central Terminal Box for Easy Wiring and Maintenance
The SS series features central terminal box wiring with a special wiring box, COM terminal, and indicator light as standard equipment. Wiring is simple and straightforward, and maintenance is highly convenient. The coil is plug-in type for one-touch replacement.
4. Wide-Ranging Compatibility and Modular Integration
The SS series offers wide-ranging compatibility for easy installation on conventional valves. When combined with modular valves, it contributes to a more compact overall device configuration.
5. International Safety Certifications for Global Use
The SS series is certified to CE (Europe), UL (USA), and CSA (Canada) international safety standards, ensuring safe use worldwide. DC solenoid power consumption (D* and E*) is reduced for energy savings.
6. High-Pressure High-Flow Performance with Minimal Pressure Loss
The SS series delivers an exceptional combination of 35 MPa maximum operating pressure and 100 L/min (G01) / 160 L/min (G03) flow capacity. The fluid reaction compensating mechanism and low pressure loss design ensure class-leading high capacity with minimal pressure loss.
Application Areas
Injection Molding Machinery — Directional control for clamping, injection, and ejection cylinders
CNC Machine Tools — Directional control for machine tool hydraulic systems
Hydraulic Presses and Forging Equipment — Directional control for presses and forming equipment
Die-Casting Machines — Directional control for high-pressure casting equipment
Construction Machinery — Directional control for excavators, loaders, and mobile equipment
Industrial Automation Production Lines — Hydraulic actuator control for automated production lines
General Industrial Hydraulic Systems — Various hydraulic directional control applications
Expert Maintenance Tips
1. Installation Guidelines
G01 size mounting surface must conform to ISO 4401-03 / CETOP 3 standards. Use M5×45 mounting bolts.
G03 size mounting surface must conform to ISO 4401-05 / CETOP 5 standards.
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.
The SS series features gasket mount installation.
2. Hydraulic Fluid Cleanliness
Recommended fluid: Petroleum-based hydraulic oil, viscosity range 15–300 mm²/s.
Fluid temperature: -20°C to +70°C.
Recommended filtration: 25 μm or less.
For water-glycol based fluids, verify seal material compatibility.
3. Electrical Connection Specifications
SS-G01-C6-R-C2-31, SS-G01-E3X-R-C2-31, and SS-G03-C5-R-C2-21 use AC200V (50/60Hz) supply.
SS-G01-A3X-R-C1-30 uses AC100V (50/60Hz) supply.
SS series features central terminal box with COM terminal and indicator light.
Ensure the terminal box is properly sealed to maintain IP64 protection.
4. Detent Usage Notes (SS-G01-E3X-R-C2-31)
The detent (no-spring) valve locks the spool in position after solenoid actuation, maintaining the position even when de-energized.
To reset, the opposing solenoid must be energized or the detent must be manually released.
Exercise caution during manual override operation — be aware of the detent lock state.
5. Periodic Maintenance Inspection
Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.
Check terminal boxes for looseness, oxidation, or moisture ingress.
The coil is plug-in type for one-touch replacement.
If response lag or unstable shifting is observed, first check system fluid cleanliness and verify the spool is not sticking.
