KSO-G02-4CD-30 | Daikin Solenoid Directional Control Valve 35 MPa 100 L/min

Product Overview

The KSO-G02-4CD-30 is a solenoid-operated directional control valve from DAIKIN Industries’ KSO-G02 series, featuring a wet armature solenoid direct-acting design. This two-position, four-way directional valve is widely used for flow direction switching and control in industrial hydraulic systems.

Manufactured to strict DAIKIN original specifications, this valve delivers consistent performance in material quality, machining precision, sealing integrity, and factory testing. Every unit undergoes 100% full-load simulation testing prior to shipment, validating pressure, flow, and directional cycling performance under real-world operating conditions. The valve offers complete interchangeability with original KSO-G02 series valves—no modifications to mounting interfaces or piping layouts are required, significantly reducing equipment downtime and retrofitting costs.

Technical Specifications 

• Model Number: KSO-G02-4CD-30

• Brand Series: DAIKIN KSO-G02 Series

• Valve Type: Solenoid Operated Directional Control Valve

• Mounting Method: Gasket Mount Type

• Nominal Diameter: 1/4 inch (G02)

• Spool Type: Sliding Spool

• Positions/Ways: 2-Position, 4-Way (configuration dependent)

• Spool Operating Method: C – Spring Center Type

• Solenoid Configuration: Double Solenoid

• Maximum Operating Pressure: 35 MPa (350 kgf/cm²)

• Maximum Flow Rate: 100 L/min

• Permissible Back Pressure: 17.5 MPa (175 kgf/cm²)

• Maximum Switching Frequency: 240 cycles/min

• Protection Class: IEC Pub529 IP65 (Dustproof and Waterproof)

• Power Supply Voltage: AC 220 V (50 Hz)

• Holding Power Consumption: 21.5 W

• Holding Current: 0.23 A

• Allowable Voltage Fluctuation: 80~110% (AC 220V 50Hz)

• Hydraulic Fluid: Petroleum-based hydraulic fluid

• Insulation Class: Class B (Coils: Class F)

• Insulation Resistance: 50 MΩ

• Withstand Voltage: AC 1500V, 1 minute

• Rated Time: Continuous

• Body Material: Cast Iron

• Weight: Approx. 1.8 kg

• Design Number: 30

Key Technical Advantages

1. Compact Design with High Power Density
The KSO-G02 series delivers 35 MPa operating pressure and 100 L/min flow capacity within a compact 1/4-inch nominal diameter valve body. This high power density makes it an ideal choice for space-constrained applications requiring high-pressure, high-flow control.

2. Superior Dust and Water Protection
Compliant with IEC Pub529 IP65 dustproof and waterproof standards, effectively resisting ingress of dust, oil mist, and water spray. CE-compliant design makes it suitable for a wide range of demanding industrial environments.

3. Low Pressure Drop for High System Efficiency
Optimized flow passages and precision-matched spool-sleeve assemblies ensure minimal pressure drop across the valve, reducing system power losses and improving overall energy efficiency.

4. High Switching Frequency with Fast Response
Maximum switching frequency of 240 cycles/min meets the demands of high-frequency directional switching applications. The wet armature solenoid design ensures reliable actuation and fast response, ideal for automated hydraulic control systems.

5. Wide Voltage Compatibility and Flexible Configurations
The KSO-G02 series offers multiple voltage options including AC100V, AC200V, AC220V, DC12V, and DC24V. A broad range of spool types and operating methods are available, including 2-position spring offset, 2-position spring centered, and 3-position spring centered configurations.

Application Areas

• Machine Tool Hydraulics: Directional control and feed regulation in machining centers

• Automation Equipment: Hydraulic actuator directional control in industrial automation lines

• Hydraulic Power Units: Directional control and system integration in compact hydraulic stations

• Plastic Machinery: Hydraulic directional switching in injection molding and extrusion equipment

• Packaging Machinery: High-frequency directional switching in packaging equipment hydraulic systems

• Test Equipment: Directional control and flow distribution in hydraulic test benches

Expert Maintenance Tips

1. Fluid Cleanliness Management
The KSO-G02 series requires high fluid cleanliness. Install a filter with ≤10μm absolute filtration upstream of the valve and monitor fluid contamination regularly. Contaminated fluid is the leading cause of spool sticking and directional failure.

2. Solenoid Coil Voltage Verification
When replacing solenoid coils, always verify that the new coil’s voltage and frequency specifications match the original exactly. The KSO-G02 series allows voltage fluctuation within 80~110% of rated value—operation outside this range may cause coil burnout or insufficient solenoid force.

3. Mounting Surface and Seal Inspection
Prior to installation, inspect the gasket mounting surface for flatness and surface finish per DAIKIN original mounting standards. When replacing O-rings, use original specification seals and avoid scratching seal grooves during installation.

4. First-Start Commissioning Procedure
Before initial system startup, perform an air-bleed cycle at reduced pressure to purge air from the valve body and lines. Cycle the valve several times before gradually increasing to operating pressure—this prevents cavitation damage to spool surfaces.

5. Back Pressure Limitations
Note that the permissible back pressure for this valve is 17.5 MPa (175 kgf/cm²). If system return line back pressure exceeds this value, external drain configuration is recommended to ensure reliable spool return.