Product Overview
The DFB-02-2B3-A110-32-6H is a core model in the Taiwan DOFLUID DFB series of wet-type solenoid directional valves, G02 size (1/4 inch), with mounting pattern conforming to NG6 / CETOP 3 / NFPA D03 standards. This is a 3-way, 2-position solenoid directional valve featuring spring offset configuration. DFA, DFB, and DFC are sub-series within the same product family, sharing identical mounting dimensions and performance specifications—differing primarily in electrical connection methods:
DFA Series: Hirschmann/DIN type connector
DFB Series: Terminal box type connection
DFC Series: Lead wire type connection
The DFB-02-2B3-A110-32-6H features 2B3 spool type (3-way, 2-position, spring offset) with single solenoid operation—when de-energized, the spool returns to the initial position by spring force. This model features terminal box type wiring with AC110V supplyand design/configuration code 32/6H.
As an original DOFLUID DFB series solenoid directional valve, this product offers complete interchangeability within the same series and size, requiring no modifications to mounting interfaces or piping layouts.
Model Code Breakdown (DFB-02-2B3-A110-32-6H):
DF: Wet-type solenoid operated directional valve series
B: Electrical connection — B=Joint box type
02: Size code — 02=1/4 inch (NG6)
2B3: Spool type (3-way, 2-position, spring offset)
A110: Coil voltage — AC110V (50/60Hz)
32: Design/configuration code
6H: Factory internal configuration code
Technical Specifications (Bulleted List)
DFB-02-2B3-A110-32-6H Specifications:
Model: DFB-02-2B3-A110-32-6H
Brand: DOFLUID (Taiwan)
Series: DFB Series
Product Type: Wet-Type Solenoid Directional Valve
Spool Configuration: 3-way, 2-position
Spring Arrangement: Spring Offset
Spool Type: 2B3
Nominal Size: G02 (1/4 inch, NG6)
Mounting Standard: NG6 / CETOP 3 / NFPA D03
Maximum Operating Pressure: 35 MPa (5000 psi)
Maximum Flow Rate: 160 L/min (42 GPM)
Allowable Back Pressure: 16 MPa (160 bar) (02 series 35C type)
Coil Voltage: AC110V (50/60Hz)
Electrical Connection: Joint Box Type
Solenoid Type: Wet-Type (Oil-Immersed)
Protection Class: IP65
Mounting Type: Subplate Mounting
Compatible Fluids: Petroleum-based hydraulic oil
Coil Construction: Integrated molded, moisture-resistant, high-temperature resistant
Key Technical Advantages
1. Wet-Type (Oil-Immersed) Solenoid Design — Quiet, Long-Life Operation
The DFB series features wet-type (oil-immersed) 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, ensuring stable and quiet operation under high-pressure and high-frequency conditions, significantly extending valve service life.
2. Dual Return Flow Path Design — Reduced Pressure Drop and Heat Generation
The DFB series features dual return flow path design, substantially reducing return line pressure drop and minimizing system temperature rise. This optimization improves system efficiency and reduces operating costs.
3. 35 MPa High Pressure and 160 L/min High Flow Capacity
The DFB series delivers 35 MPa (5,000 psi) operating pressure and 160 L/min (42 GPM) flow capacity in a compact NG6 package. Allowable back pressure reaches 160 bar. This performance places it at the forefront of directional control valves in its class.
4. Integrated Coil Design for Superior Environmental Resistance
Coils feature integrated molded construction, delivering excellent moisture resistance, heat dissipation, and high-temperature performance. IP65 protection is achieved with properly installed connector, effectively resisting dust and water ingress.
5. Surge-Free Coil Option — Reduced Voltage Spikes
Optional surge-free coils reduce voltage spikes, providing quieter operation and extended relay contact life.
6. International Standard Compliance for Global Interchangeability
Mounting conforms to NG6 / CETOP 3 / NFPA D03 international standards. Fully compatible with globally adopted NG6 size interfaces for direct replacement of same-series, same-specification products. Coils comply with DIN 43650 and ISO 4400 standards. AC coils operate on 50/60Hz without rewiring when changing frequency. DC coils are non-polarized.
Application Areas
Injection Molding Machinery — Directional control for hydraulic systems
Hydraulic Presses — Directional control for pressing equipment
Vulcanizing Presses — Hydraulic control for rubber vulcanizing equipment
Woodworking Machinery — Hydraulic actuator control
CNC Machine Tools — Directional control for machine tool hydraulic systems
Industrial Automation Production Lines — Hydraulic actuator control for automated production lines
Expert Maintenance Tips
1. Installation Guidelines
DFB-02 series mounting must conform to NG6 / CETOP 3 / NFPA D03 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.
DFB series features terminal box type connection—ensure the terminal box is properly sealed during installation.
2. Hydraulic Fluid Cleanliness
Recommended fluid: Petroleum-based hydraulic oil.
Allowable back pressure: 16 MPa (160 bar) (02 series 35C type).
Install a return line filter with minimum 25 μm filtration rating upstream of the valve.
3. Electrical Connection Specifications
DFB-02-2B3-A110-32-6H uses AC110V (50/60Hz) supply. Verify supply voltage matches coil rated voltage before connection.
DFB series features terminal box type connection—ensure the cover is properly sealed to maintain IP65 protection.
AC coils operate on 50/60Hz without rewiring when changing frequency.
4. Spool Type Usage Considerations
2B3 type (3-way, 2-position, spring offset) : Single solenoid operation with automatic spring return. Suitable for single-solenoid directional control applications requiring automatic return upon de-energization.
Optional shockless type (S) is available to reduce spool shifting speed.
When using specific spool types in differential or special circuits, the T port must not be plugged—it must be piped to the tank.
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.
Coils can be replaced quickly without affecting wiring and without risk of leakage.
If response lag or unstable shifting is observed, first check system fluid cleanliness and verify the spool is not sticking.
Do not energize AC coils when not installed on the armature—this may cause coil burnout.
