Product Overview

The SWH-G02 is a NORTHMAN high-pressure, high-flow solenoid-operated directional control valve designed for hydraulic flow switching, actuator control and directional operation.

Northman classifies the SWH-G02 as a solenoid operated directional valve with a subplate-mounted construction and a 6 mm nominal size. The official documentation specifies a wet-armature solenoid design, interchangeable coils and interchangeable spools and bodies.

The official SWH-G02 specifications include:

• Maximum operating pressure: 315 kgf/cm² / 4500 PSI
• Rated flow capacity: 63 L/min maximum, depending on spool type
• Maximum tank-line back pressure: 140 kgf/cm² / 2000 PSI
• Maximum operating frequency: 300 CPM
• Recommended filtration: 25 micron
• Hydraulic fluid: Mineral oil
• Viscosity: 10–400 cSt
• Temperature range: -25°C to +90°C

The product family includes multiple spool configurations such as C2, C3, C4, C6 and C2B, allowing the valve to be configured for different directional-control functions.

For replacement applications, the complete configuration must be matched, including:

spool symbol + coil voltage + wiring + optional functions + mounting interface

Our replacement solutions focus on in-situ interchangeability and 100% simulated operating-condition testing.

Technical Specifications

SWH-G02 Series

• Manufacturer: NORTHMAN
• Series: SWH-G02
• Product Type: Solenoid Operated Directional Valve
• Construction: Direct-operated spool valve
• Mounting: Subplate mounted
• Nominal Size: 6 mm
• Interface: G02 / ISO 4401-03 / CETOP 3 / NG6
• Maximum Operating Pressure: 315 kgf/cm² / 4500 PSI
• Maximum Rated Flow: 63 L/min, depending on spool type
• Maximum Tank-Line Back Pressure: 140 kgf/cm² / 2000 PSI
• Maximum Operating Frequency: 300 CPM
• Recommended Filtration: 25 micron
• Hydraulic Fluid: Mineral oil
• Viscosity Range: 10–400 cSt
• Temperature Range: -25°C to +90°C
• Solenoid: Wet-armature type
• Coil: Plug-in / interchangeable
• Protection: IP65
• Spool: Interchangeable
• Valve Body: Interchangeable within the series
• Displacement: Not applicable
• Maximum Rotational Speed: Not applicable.

SWH-G02-C3-D24-10

• Full Model: SWH-G02-C3-D24-10
• Series: SWH-G02
• Spool Code: C3
• Spool Function Group: 4-way, 3-position, spring-centered
• Coil Voltage: D24 = DC24V
• Wiring: 10
• Electrical Connection: Joint box with indicator light
• Maximum Pressure: 315 kgf/cm² / 4500 PSI
• Maximum Rated Flow: 63 L/min, depending on spool type
• Maximum Tank Back Pressure: 140 kgf/cm² / 2000 PSI
• Maximum Operating Frequency: 300 CPM
• Recommended Filtration: 25 micron.

The complete SWH-G02-C3-D24-10 model is also listed in industrial distribution records.

SWH-G02-C2-D24-10

• Full Model: SWH-G02-C2-D24-10
• Series: SWH-G02
• Spool Code: C2
• Spool Function Group: 4-way, 3-position, spring-centered
• Coil Voltage: D24 = DC24V
• Wiring: 10
• Electrical Connection: Joint box with indicator light
• Maximum Pressure: 315 kgf/cm² / 4500 PSI
• Maximum Rated Flow: 63 L/min, depending on spool type
• Maximum Tank Back Pressure: 140 kgf/cm² / 2000 PSI
• Maximum Operating Frequency: 300 CPM
• Recommended Filtration: 25 micron.

The exact SWH-G02-C2-D24-10 model is also documented by industrial distributors.

SWH-G02-C22-D24-20-M3

• Full Model: SWH-G02-C22-D24-20-M3
• Series: SWH-G02
• Spool Code: C22
• Coil Voltage: D24 = DC24V
• Wiring: 20
• Electrical Connection: Hirschmann type with indicator
• Additional Suffix: M3
• Maximum Pressure: 315 kgf/cm² / 4500 PSI for the G02 platform
• Maximum Rated Flow: 63 L/min maximum platform capacity, subject to spool characteristics
• Maximum Tank Back Pressure: 140 kgf/cm² / 2000 PSI

The complete C22-D24-20-M3 model appears in Northman-related product records. However, the current publicly accessible Northman G02 spool documentation reviewed for this verification does not provide sufficient evidence to define C22 and M3 independently, so no additional engineering meaning is assigned to those codes here.

SWH-G03 Family

The original title also includes SWH-G03-C2/C3/C4/C6.

Northman’s official catalogue treats SWH-G03 as a separate subplate-mounted platform with a 10 mm nominal size, rather than the 6 mm G02 platform.

Therefore:

• SWH-G02: 6 mm / NG6 class
• SWH-G03: 10 mm class

These should not be presented as one identical valve size.

Key Technical Advantages

1. Wet-Armature Solenoid Design

Northman states that the armature operates in the hydraulic oil system, cushioning impact, reducing noise and increasing solenoid life.

2. No Pushpin Seal

The wet-armature design eliminates the pushpin seal, reducing seal wear and leakage associated with repeated solenoid movement.

3. High Pressure and High Flow

The G02 platform provides up to 315 kgf/cm² / 4500 PSI and 63 L/min maximum rated flow capacity, subject to spool type.

4. Balanced Spool Design

Northman specifies a specially designed balanced spool intended to achieve suitable shifting force and improve operational reliability and service life.

5. Low-Pressure-Drop Flow Passages

The valve body incorporates flow passages designed to reduce pressure drop, supporting lower hydraulic losses in high-flow circuits.

6. Interchangeable Spools and Bodies

Northman explicitly states that all spools and bodies are interchangeable, providing a strong advantage for maintenance and replacement programs.

7. Plug-In Coil Maintenance

The plug-in solenoid arrangement simplifies maintenance and allows the coil to be serviced separately from the hydraulic body.

Application Areas

Typical applications include:

• Industrial hydraulic power units
• Machine tools
• Injection molding machines
• Automated production equipment
• Hydraulic clamping systems
• Hydraulic cylinder directional control
• Hydraulic motor start/stop and reversing circuits
• Material-handling machinery
• Construction-equipment auxiliary hydraulics
• General industrial hydraulic control systems

The SWH-G02-C22-D24-20-M3 configuration also appears in market records associated with Haitian injection-molding hydraulic systems, but the exact engineering meaning of the M3 suffix has not been independently verified from the manufacturer’s current public documentation.

Expert Maintenance Tips

1. Match the Exact Spool Symbol

C2, C3, C4, C6 and other spool codes represent different hydraulic symbols and functional states. The hydraulic symbol must be matched before replacement.

2. Verify the DC24V Coil

Northman defines D24 as DC24V and specifies an operating range of 21.6–26.4 V for the standard D24 coil.

3. Maintain 25-Micron Filtration

The manufacturer recommends 25-micron filtration for the G02 series. Good contamination control is essential for reliable spool movement and leakage control.

4. Control Tank-Line Back Pressure

The G02 maximum tank-line back pressure is 140 kgf/cm² / 2000 PSI. Return-line restrictions and blocked filters should therefore be avoided.

5. Verify AC/DC Coil Type During Service

The SWH family is available with multiple AC and DC coil configurations, including D12 and D24 DC versions and multiple AC voltage variants. Coil selection must therefore match the actual control voltage.

6. Inspect the Mounting Surface and O-Rings

The valve is subplate mounted. Before installation, clean the mounting surface and inspect all O-rings. Northman documentation specifies AS568-012 O-rings and provides installation bolt and tightening-torque information.

7. Perform Full Operating-Condition Testing

After replacement, verify:

coil energization → spool shifting → P/A/B/T pressure → low-flow operation → rated-condition operation → leakage

Our replacement process additionally uses 100% simulated operating-condition testing to verify hydraulic function, electrical operation and replacement compatibility.