Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJK 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 40 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 grade40 µm
- Bowl materialNylon
- Drainautomatic
- Pressure gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJK
The GAFR500N20ALJK is a filter and regulator combined into a single body, with no lubricator section. It handles 3/4" ports and regulates within a lower pressure band of 0.15-0.4 MPa (20-58 psi), filtering down to 40 um. Weighing 950 g, this unit's nylon bowl holds 108 cc of condensate, and the automatic drain clears it without manual attention.
The diversion structure spins incoming air to separate liquid water and solid particles before regulation. A balanced, self-locking mechanism keeps the outlet pressure steady as supply varies, resisting drift from vibration. This model includes a circular gauge with MPa/psi scale and a reverse-flow valve fitted as an ordering option.
Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJK |
|---|---|
| Series | GAFR500 filter & regulator |
| Port size | 3/4" (PT thread) |
| Filtering grade | 40 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 GAFR500N20ALJK
| 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. |
| (blank) | Filtering grade 40 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 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 GAFR500N20ALJK Is Used
Machine header supply
Feed a 3/4" header serving multiple pneumatic valves on a production line, where the lower pressure range protects sensitive equipment and the automatic drain handles condensate without downtime.
Low-pressure precision circuits
Regulate instrument air at 0.15-0.4 MPa for precision gauging or inspection fixtures that require a stable, lower supply pressure with fine filtration.
Panel-mounted utility station
Mount on an existing panel where the bracket is omitted (J), using the 3/4" port to supply a clean, regulated air drop for maintenance tools or test benches.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJK the Right Air-Prep Unit?
Choose the GAFR500 body for 3/4" piping where a 950 g unit needs proper panel or frame mounting, not support from tubing. The nylon bowl suits environments where a transparent PC bowl is not preferred, though compatibility for aggressive surroundings should be confirmed. This model has an automatic drain (A) for unattended or wet lines, and the J code means no mounting bracket is included, so plan for panel-mount or existing brackets. The L type tops out at 0.4 MPa, so if the machine may ever need more pressure, the standard S type is the correct choice. The 40 um element handles general shop air, while the fitted gauge reads in MPa/psi with PT threads. If oil is needed downstream, 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 the 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 GAFR500N20ALJK FAQ
The GAFR500N20ALJK operates at 0.15-0.4 MPa (20-58 psi), with a max 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. It has a 108 cc drain bowl, weighs 950 g, and filters to 40 um.
The K code indicates a reverse-flow (reflux) valve is fitted to the GAFR500N20ALJK. It is an ordering difference from models without the K code, and its function is detailed in the catalogue's separate reflux valve section.
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