Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK is a genuine two-in-one filter & regulator — a diversion-type water/particulate filter and a balanced pressure regulator built into ONE body. It has 1/2" ports, a 5 µm filter element and regulates 0.15 - 0.4 MPa (20 - 58 psi). It has no lubricator, so it adds no oil to the airflow.
- TypeFilter & regulator
- Port size1/2"
- Pressure range0.15 - 0.4 MPa (20 - 58 psi)
- Filtering grade5 µm
- Bowl materialNylon
- Drainautomatic
- Pressure gaugeCircular, MPa / psi
- Weight880 g
About the Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK
The GAFR400N15ALWK is a filter and regulator combined into a single body, saving rail space and reducing potential leak points compared to separate units. This 1/2in version weighs 880 g and uses a 5 um element to trap fine particles for sensitive downstream equipment.
Its lower-pressure regulator operates from 0.15 to 0.4 MPa (20-58 psi), with the automatic drain clearing condensate from the 100 cc bowl without manual intervention. The nylon bowl and fitted reverse-flow valve make this a specialized configuration for applications requiring clean, regulated air at modest pressures.
Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK |
|---|---|
| Series | GAFR400 filter & regulator |
| Port size | 1/2" (PT thread) |
| Filtering grade | 5 µm |
| Pressure range | 0.15 - 0.4 MPa (20 - 58 psi) |
| Type | Lower pressure |
| Bowl material | Nylon |
| Drain type | Automatic drain |
| Fluid | Air |
|---|---|
| Max. pressure | 1.0 MPa (145 psi) |
| Proof pressure | 1.5 MPa (215 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Capacity of drain bowl | 100 cc |
| Bracket | Included |
| Weight | 880 g |
Specifications follow the official AirTAC GAFR catalogue (pages 235-236). Air must not freeze in the unit. The fitted circular gauge reads in MPa / psi, set by the PT thread code. This unit filters and regulates only; it does not add lubrication.
Model Code: Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK
| GAFR400 | GA400 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| N | Bowl material: Nylon. Available on this body: PC (blank), Metal (C), Nylon (N). |
| 15 | Port size 1/2". This body offers 10 = 3/8", 15 = 1/2". |
| A | Drain: Automatic drain. |
| L | Lower pressure type — 0.15 - 0.4 MPa (20 - 58 psi). This body offers Standard (S) or Lower pressure (L). |
| (blank) | Mounting bracket included. |
| (blank) | Circular pressure gauge fitted. |
| W | Filtering grade 5 µm. |
| (blank) | PT thread; gauge scale MPa / psi. |
| K | Reverse-flow (reflux) valve attached. |
The filter and the regulator are ONE body here — there is no separate GAF filter or GAR regulator part to assemble. Need lubrication downstream too? Add a lubricator by ordering the matching GAFC400-15 F.R.L. combination instead.
Size Class & Flow Envelope
- GAFR2001/8"-1/4" · 2000 L/min
- GAFR3001/4"-1/2" · 3500 L/min
- GAFR4003/8"-1/2" · 7000 L/min
- GAFR5003/4" · 8000 L/min
- GAFR6003/4"-1" · 12000 L/min
Figures are the end of the flow curve plotted in the AirTAC catalogue at 0.7 MPa inlet pressure — a sizing envelope for comparing bodies, not a rated flow. Read the catalogue curve for a real duty point. Outlet pressure falls as flow rises, so size a body with headroom above your peak demand.
| This model | GAFR400 · 1/2" · curve to 7000 L/min |
|---|---|
| One size down | GAFR300 |
| One size up | GAFR500 (curve to 8000 L/min) |
| Add a lubricator | GAFC400-15 (F.R.L. combination) |
Where the Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK Is Used
Precision valve control
Feed a bank of precision pneumatic valves that require clean, 5 um filtered air at a stable lower pressure. The automatic drain keeps the 100 cc bowl from filling during long production runs.
Machine tool coolant lines
Regulate air for coolant mist systems on CNC machines where consistent lower pressure prevents over-spray. The nylon bowl resists the occasional splash of cutting fluid better than PC.
Test bench air supply
Provide a clean, regulated air source for laboratory fixtures and test jigs. The 5 um element protects sensitive instrumentation, while the gauge allows operators to verify set pressure at a glance.
Is the Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK the Right Air-Prep Unit?
Choose this GAFR400 when you need 1/2in ports and a 100 cc condensate bowl, stepping up from the GAFR300's 60 cc bowl for longer intervals between drain checks. The nylon bowl suits environments where PC might be a concern, while the automatic drain handles wet lines or unattended operation. The 5 um element filters finer than the standard 40 um, ideal for precision valves, though it will require more frequent service. The lower-pressure L type is selected when the application never needs more than 0.4 MPa, and the included bracket simplifies panel mounting. The fitted gauge shows MPa/psi, and the reverse-flow valve is an ordering option. If oil is needed downstream, order the matching GAFC400-15 combination instead. With 1.0 MPa max supply, you have about 0.6 MPa of headroom above the 0.4 MPa top of the regulated range.
Quick checklist
- ✓ Body size for your peak flow (1/2" here)
- ✓ Standard 0.9 MPa or lower-pressure 0.4 MPa
- ✓ Bowl material: PC (blank), Metal (C), Nylon (N)
- ✓ Drain: semi-auto + manual, or automatic
- ✓ Element 40 µm or 5 µm
- ✓ Bracket kept or removed (J); add a lubricator = GAFC
Installation & Maintenance Notes
- check Install with the airflow arrow: IN to OUT, gauge/knob accessible.
- check Keep inlet pressure at or below 1.0 MPa (145 psi).
- check Set pressure with the pressed-in self-locking knob; pull to adjust, press to lock.
- check Drain condensate before the 100 cc bowl fills.
- check Keep the unit above freezing (-5 to +70 °C, unfreeze).
- check Support the 880 g unit on its bracket, not on the tubing.
This is a filter and regulator only — it delivers filtered, pressure-set air with no added oil. If a downstream tool needs lubrication, add a separate lubricator or order the GAFC400-15 combination; do not expect an oil mist from this unit.
Airtac GAFR Adjustable Filter Regulator GAFR400N15ALWK FAQ
This filter & regulator has a 1/2in port, a lower-pressure range of 0.15-0.4 MPa (20-58 psi), a maximum pressure of 1.0 MPa (145 psi), and a proof pressure of 1.5 MPa (215 psi). It operates from -5 to 70 C, has a 100 cc drain bowl, and weighs 880 g. The 5 um element and automatic drain are fitted, with a nylon bowl and reverse-flow valve included.
The reverse-flow valve is an ordering difference on this model, fitted as an option. Its specific function is detailed in the catalogue on a page not included in our data, so we cannot explain its operation. It is simply present on this configuration.
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