Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJ
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJ 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 materialMetal
- Drainautomatic
- Pressure gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJ
The GAFR500C20ALJ is a filter and pressure regulator combined into a single body, eliminating the need for separate GAF and GAR units. This 3/4in model handles a lower pressure band of 0.15-0.4 MPa (20-58 psi) and uses a 40 um element to strain solids and spun-out water into its 108 cc metal condensate bowl.
Its balanced regulator mechanism keeps the outlet steady as inlet pressure shifts, while the pressed-in self-locking knob resists drift from vibration. With a 950 g mass, this unit demands a proper panel or frame mount rather than support from the tubing alone, and the fitted circular gauge reads in MPa/psi.
Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJ Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJ |
|---|---|
| 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 | Metal |
| 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 GAFR500C20ALJ
| GAFR500 | GA500 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| C | Bowl material: Metal. 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. |
| (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 GAFR500C20ALJ Is Used
Machine header feed
Supply a 3/4in header feeding multiple pneumatic actuators on a production machine, where the lower pressure range protects sensitive tooling.
Precision assembly station
Regulate air for a precision assembly station that requires a stable, low-pressure supply to avoid over-force on delicate components.
Test rig air supply
Provide clean, regulated air to a test rig with a 3/4in inlet, where the automatic drain keeps the bowl from filling during long test cycles.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJ the Right Air-Prep Unit?
Choose this GAFR500 for a 3/4in line where the lower 0.15-0.4 MPa (20-58 psi) range is sufficient; if the machine may ever need more pressure, the standard S type is the correct pick. The metal bowl suits demanding environments, and the automatic drain handles unattended operation or wet lines without manual intervention. This model ships without a mounting bracket (J), so plan for a panel mount or existing bracket, and the 40 um element is the standard grade for general shop air. The PT thread carries an MPa/psi gauge scale, and no reverse-flow valve is fitted. 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 this unit's 0.4 MPa regulated ceiling.
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 GAFR500C20ALJ FAQ
The GAFR500C20ALJ is a filter & regulator with a 3/4in port, working pressure range of 0.15-0.4 MPa (20-58 psi), maximum pressure of 1.0 MPa (145 psi), and proof pressure of 1.5 MPa (215 psi). It operates from -5 to 70 C, has a 108 cc drain bowl, and weighs 950 g. The unit features a 40 um element and an automatic drain.
The 'L' code designates the lower-pressure type, which tops out at 0.4 MPa (58 psi) instead of the standard 0.9 MPa. The 'J' code means the mounting bracket is not included, so you must use a panel mount or an existing bracket. This model also has a metal bowl and an automatic drain for wet or unattended lines.
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