Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW 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 3/4" 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 size3/4"
- Pressure range0.15 - 0.4 MPa (20 - 58 psi)
- Filtering grade5 µm
- Bowl materialNylon
- Drainautomatic
- Pressure gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW
The GAFR500N20ALJW is a filter and regulator combined into a single 3/4in body, eliminating the need for separate filter and regulator units. It delivers air filtered to 5 um while maintaining a lower pressure range of 0.15-0.4 MPa (20-58 psi), with a circular gauge showing the MPa/psi scale.
This 950 g unit features a nylon bowl with an automatic drain, making it suitable for installations where regular manual draining is impractical. The diversion structure spins incoming air to separate liquid water and solid particles into the 108 cc condensate bowl, while the balanced, self-locking regulator holds the set pressure steady against supply variations.
Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW |
|---|---|
| Series | GAFR500 filter & regulator |
| Port size | 3/4" (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 | 108 cc |
| Bracket | Not included (J) |
| Weight | 950 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 GAFR500N20ALJW
| GAFR500 | GA500 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). |
| 20 | Port size 3/4". This body offers 20 = 3/4". |
| 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). |
| J | No bracket (J) — supplied without the mounting bracket. |
| (blank) | Circular pressure gauge fitted. |
| W | Filtering grade 5 µm. |
| (blank) | PT thread; gauge scale MPa / psi. |
| (blank) | No reverse-flow valve. |
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 GAFC500-20 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 | GAFR500 · 3/4" · curve to 8000 L/min |
|---|---|
| One size down | GAFR400 |
| One size up | GAFR600 (curve to 12000 L/min) |
| Add a lubricator | GAFC500-20 (F.R.L. combination) |
Where the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW Is Used
Precision valve control
Feed a bank of precision pneumatic valves on a 3/4in manifold where the 5 um element protects fine internal passages and the lower pressure range prevents over-pressurizing sensitive actuators.
Machine tool coolant lines
Supply filtered air to machine tool coolant systems where the automatic drain handles condensate from high-humidity shop air without requiring daily manual attention.
Assembly line workstations
Power multiple assembly fixtures from a single 3/4in drop, using the 108 cc bowl to reduce drain frequency and the 5 um element to keep downstream tooling clean.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW the Right Air-Prep Unit?
Choose the GAFR500 for 3/4in lines needing a 108 cc drain bowl and an 8000 L/min flow envelope at 0.7 MPa inlet; step down to the GAFR400 (100 cc bowl, 7000 L/min envelope) for 1/2in ports or up to the GAFR600 (205 cc bowl, 12000 L/min envelope) for 1in headers. The nylon bowl suits environments where weight matters, while the automatic drain handles wet or unattended lines without manual intervention. This L-type unit tops out at 0.4 MPa, so select the standard S type if your system may need up to 0.9 MPa. The J code omits the mounting bracket for panel-mount installations, and the 5 um element traps finer particles than the standard 40 um for precision applications. The PT thread carries the MPa/psi gauge scale, and a K option adds a reverse-flow valve if needed. For lines requiring downstream lubrication, order the matching GAFC500-20 combination instead. With a 1.0 MPa max supply, you have about 0.6 MPa of headroom above the 0.4 MPa top of this unit's regulated range.
Quick checklist
- ✓ Body size for your peak flow (3/4" 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 108 cc bowl fills.
- check Keep the unit above freezing (-5 to +70 °C, unfreeze).
- check Support the 950 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 GAFC500-20 combination; do not expect an oil mist from this unit.
Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJW FAQ
This unit operates in the lower pressure range of 0.15-0.4 MPa (20-58 psi), with a maximum pressure of 1.0 MPa (145 psi) and proof pressure of 1.5 MPa (215 psi). Temperature range is -5 to 70 C and must not freeze. The drain bowl holds 108 cc and the unit weighs 950 g. It has a 3/4in port, 5 um filtration, and a circular gauge with MPa/psi scale.
The nylon bowl (N before the port code) is a build choice for the condensate chamber, with the same 1.0 MPa max pressure and -5 to 70 C rating as PC or metal bowls. The J code means the mounting bracket is not included, so you must provide your own panel mount or existing bracket for installation.
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