Product Overview
The KSO-G03-2BP-20-P-194, KSO-G02-4CB-30-N, and KSO-G02-2BA-30-E are core models in the DAIKIN KSO series of solenoid pilot-operated directional control valves, covering G03 (3/8 inch) and G02 (1/4 inch) nominal sizes. The KSO series achieves an exceptional combination of 35 MPa (350 kgf/cm²) high pressure and 160 L/min (G03) and 100 L/min (G02) high flow capacity. Constructed from high-strength cast iron, the valve body delivers superior rigidity and fatigue resistance. The product is designed to IEC Pub529 IP65 dust and water-proof standards and complies with European CE safety regulations, suitable for demanding industrial environments.
KSO-G03-2BP-20-P-194 (4-way, 2-position, spring return):
The KSO-G03-2BP-20-P-194 is a G03 size 4-way, 2-position solenoid directional valve featuring spring return configuration. This valve operates on DC24V supply. The 4-way, 2-position spring return configuration is ideal for single-solenoid directional control applications requiring automatic return upon de-energization.
KSO-G02-4CB-30-N (4-way, 3-position, spring centered):
The KSO-G02-4CB-30-N is a G02 size 4-way, 3-position solenoid directional valve featuring spring centered configuration. This valve operates on AC200V supply (50/60Hz), with terminal box wiring, indicator lamp, and built-in surge killer. The 4-way, 3-position spring centered configuration is the most widely used standard valve type in industrial hydraulic systems—the spool automatically returns to neutral by spring force when de-energized.
KSO-G02-2BA-30-E (2-way, 2-position, spring offset):
The KSO-G02-2BA-30-E is a G02 size 2-way, 2-position solenoid directional valve featuring spring offset configuration. This valve operates on DC24V supply, with terminal box wiring and indicator lamp. The 2-way, 2-position spring offset configuration is suitable for simple on/off control and unloading circuit applications.
As original DAIKIN KSO series solenoid valves, these products offer complete interchangeability within the same series and size, requiring no modifications to mounting interfaces or piping layouts. The KSO-G02 and KSO-G03 series support modular stack valve configurations.
Technical Specifications
KSO-G02 Series Common Specifications:
Brand: DAIKIN
Series: KSO Series
Nominal Size: G02 (1/4 inch)
Mounting Type: Gasket Mount
Mounting Standard: ISO 4401-03 / CETOP 3 / NG6
Maximum Operating Pressure: 35 MPa (350 kgf/cm²)
Note: Certain spool types (5C/66C/51C) have maximum operating pressure of 25 MPa (250 kgf/cm²)
Maximum Flow Rate: 100 L/min (G02)
Allowable Back Pressure: 17.5 MPa (175 kgf/cm²)
Maximum Shifting Frequency: 240 cycles/min
Protection Class: IEC Pub529 IP65
Insulation Class: Class B (Coil: Class H)
Dielectric Strength: AC1500V for 1 minute
Insulation Resistance: 50 MΩ minimum
Compatible Fluids: Petroleum-based hydraulic oil
Mounting Bolts: M5×45 (4 bolts)
Tightening Torque: 6.5–8.5 N·m
KSO-G03 Series Common Specifications:
Brand: DAIKIN
Series: KSO Series
Nominal Size: G03 (3/8 inch)
Mounting Type: Gasket Mount
Mounting Standard: ISO 4401-05 / CETOP 5 / NG10
Maximum Operating Pressure: 35 MPa (350 kgf/cm²)
Maximum Flow Rate: 160 L/min (DC) / 130 L/min (AC)
Allowable Back Pressure: 16 MPa (160 kgf/cm²)
Maximum Shifting Frequency: 240 cycles/min
Protection Class: IEC Pub529 IP65
Insulation Class: Class B (Coil: Class H)
Dielectric Strength: AC1500V for 1 minute
Insulation Resistance: 50 MΩ minimum
Compatible Fluids: Petroleum-based hydraulic oil
Mounting Bolts: M6×35 (4 bolts)
Tightening Torque: 12–15 N·m
KSO-G03-2BP-20-P-194 Specifications:
Model: KSO-G03-2BP-20-P-194
Spool Configuration: 4-way, 2-position
Spring Arrangement: Spring Return
Voltage: DC24V
Wiring: Terminal Box Type
Indicator Lamp: Equipped
Surge Killer: Not equipped
Design Number: 20
Option Code: P-194
Weight: 4.4 kg
KSO-G02-4CB-30-N Specifications:
Model: KSO-G02-4CB-30-N
Spool Configuration: 4-way, 3-position
Spring Arrangement: Spring Centered
Voltage: AC200V (50/60Hz)
Starting Current: AC200V 50Hz: 1.21A / 60Hz: 1.07A
Holding Current: AC200V 50Hz: 0.26A / 60Hz: 0.19A
Holding Power: AC200V 50Hz: 21.5W / 60Hz: 18W
Permissible Voltage Fluctuation: AC200V 50Hz: 80–110% / 60Hz: 90–121%
Wiring: Terminal Box Type
Indicator Lamp: Equipped
Surge Killer: Equipped
Operating Time: Energized 0.01–0.025s / Spring Return 0.01–0.045s
Weight: 1.8 kg
KSO-G02-2BA-30-E Specifications:
Model: KSO-G02-2BA-30-E
Spool Configuration: 2-way, 2-position
Spring Arrangement: Spring Offset
Voltage: DC24V
Wiring: Terminal Box Type
Indicator Lamp: Equipped
Surge Killer: Not equipped
Design Number: 30
Option Code: E
Weight: Approx. 1.5–1.8 kg (Reference only)
Key Technical Advantages
1. High-Pressure High-Flow Performance
The KSO series delivers an exceptional combination of 35 MPa operating pressure and 100 L/min (G02) and 160 L/min (G03) flow capacity. This performance places it at the forefront of solenoid directional control valves in its class, making it suitable for demanding high-pressure, high-flow hydraulic systems.
2. Rugged Environmental Protection
Designed to IEC Pub529 IP65 dust and water-proof standards, the valve features effective protection against dust ingress and water jets from any direction. CE compliance makes it suitable for export to European markets and equipment requiring CE certification.
3. High-Reliability Solenoid System
The solenoid coil utilizes Class H insulation material for excellent heat resistance. AC200V-powered models feature 80–121% voltage tolerance range. Insulation resistance exceeds 50 MΩ with dielectric strength of AC1500V for 1 minute. The solenoid supports continuous duty rating, ensuring long-term stable operation.
4. Precision Machining and Long Service Life
The valve body is manufactured from high-strength cast iron, with spool and bore surfaces precision-ground to ensure minimal internal leakage and long-term shifting accuracy. With a maximum shifting frequency of 240 cycles/min, the valve is ideal for high-cycle applications.
5. Flexible Spool Functions and Electrical Options
The KSO series offers a wide range of spool configurations—2-way 2-position (2BA), 4-way 2-position (2BP), 4-way 3-position spring centered (4CB), and more. Supports multiple voltage options including AC200V and DC24V. The KSO-G02-4CB-30-N features a built-in surge killer to suppress interference with control circuits during valve switching.
6. Modular Stack Valve Compatibility
The KSO-G02 and KSO-G03 series support modular stack valve configurations. Allows flexible integration of throttle valves, check valves, pressure reducing valves, and other hydraulic components—significantly simplifying hydraulic system layout and reducing leakage risk.
Application Areas
KSO-G03-2BP-20-P-194 (4-way, 2-position, spring return):
Injection Molding Machinery — Directional control for clamping, injection, and ejection cylinders
Hydraulic Presses and Forging Equipment — Directional control for presses and forming equipment
Construction Machinery — High-flow hydraulic directional control for excavators, loaders, and mobile equipment
Steel and Mining Equipment — Directional control for rolling mills and heavy-duty hydraulic systems
KSO-G02-4CB-30-N (4-way, 3-position, spring centered):
Injection Molding Machinery — Standard directional control for injection molding machine hydraulic systems
CNC Machine Tools — Directional control for machine tool hydraulic systems
Die-Casting Machines — Directional control for high-pressure casting equipment
Industrial Automation Production Lines — Hydraulic actuator control for automated production lines
General Industrial Hydraulic Systems — Standard 4-way, 3-position directional control
KSO-G02-2BA-30-E (2-way, 2-position, spring offset):
Unloading Circuits — System unloading and pressure release control
Hydraulic Cylinder Rapid Traverse — Oil circuit switching for differential circuits
Cooling and Filtration Circuits — On/off control for auxiliary oil circuits
Safety Interlock Devices — Emergency shutdown and safety valve control
Expert Maintenance Tips
1. Installation Guidelines
G02 size mounting surface must conform to ISO 4401-03 / CETOP 3 / NG6 standards. Use 4 M5×45 mounting bolts with recommended tightening torque of 6.5–8.5 N·m.
G03 size mounting surface must conform to ISO 4401-05 / CETOP 5 / NG10 standards. Use 4 M6×35 mounting bolts with recommended tightening torque of 12–15 N·m.
Thoroughly clean the mounting surface and all ports (P, A, B, T) before installation to prevent foreign particles from entering the valve and causing spool sticking or seal damage.
KSO-G02 and KSO-G03 series support modular stack valve configurations—pay attention to sealing and bolt length between stacked valve layers.
2. Hydraulic Fluid Cleanliness
Recommended fluid: Petroleum-based hydraulic oil. For water-glycol based fluids, verify seal material compatibility.
Note: Certain spool types (5C/66C/51C) have maximum operating pressure of 25 MPa (250 kgf/cm²), not 35 MPa. Confirm pressure rating with the complete model code.
Install a return line filter with minimum 25 μm filtration rating upstream of the valve.
3. Electrical Connection Specifications
KSO-G03-2BP-20-P-194 uses DC24V supply.
KSO-G02-4CB-30-N uses AC200V supply (50/60Hz). Permissible voltage fluctuation: 50Hz 80–110% / 60Hz 90–121%.
KSO-G02-2BA-30-E uses DC24V supply.
KSO-G02-4CB-30-N features built-in surge killer—no additional surge suppressor required.
4. Back Pressure Control
5. Periodic Maintenance Inspection
Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.
Check electrical connectors/terminal boxes 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.
Indicator lamps (on terminal box models with indicators) help quickly verify solenoid energization status.
