Airtac GAFR Adjustable Filter Regulator GAFR500C20ALN
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500C20ALN 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 gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALN
The GAFR500C20ALN is a filter and regulator combined in a single body, cleaning incoming air and holding a steady outlet pressure without a separate filter-regulator pair. This metal-bowl version uses a 3/4in port and a 40 um element, with a lower-pressure range of 0.15-0.4 MPa (20-58 psi) for applications that need a modest, stable setting.
The automatic drain clears condensate without manual attention, and the 108 cc bowl holds a substantial volume of water and solids between services. At 950 g, this unit is built for panel or frame mounting rather than support from the tubing, and it replaces the need for two separate components on the line.
Airtac GAFR Adjustable Filter Regulator GAFR500C20ALN Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500C20ALN |
|---|---|
| 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 | Included |
| Weight | 950 g |
Specifications follow the official AirTAC GAFR catalogue (pages 235-236). Air must not freeze in the unit. No gauge is supplied with this model — the gauge connection on a GAFR500 is 1/4" if you add one. This unit filters and regulates only; it does not add lubrication.
Model Code: Airtac GAFR Adjustable Filter Regulator GAFR500C20ALN
| 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). |
| (blank) | Mounting bracket included. |
| N | No pressure gauge; 1/4" gauge connection. |
| (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 GAFR500C20ALN Is Used
Machine tool header
Feed a multi-station machining center with filtered air at a steady 0.3 MPa, relying on the automatic drain to handle condensate from a busy production line.
Assembly station air
Supply a clean, regulated 0.35 MPa to pneumatic clamps and fixtures on an assembly bench, where the lower pressure range protects delicate workpieces.
Test rig supply
Provide a stable 0.2 MPa to a leak-test fixture, with the metal bowl and automatic drain reducing maintenance on a continuously running setup.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALN the Right Air-Prep Unit?
Choose the GAFR500 body when you need 3/4in ports and a flow envelope plotted to 8000 L/min at 0.7 MPa inlet, stepping up from the GAFR400's 7000 L/min envelope for larger machine headers. The metal bowl suits demanding environments, while the automatic drain handles wet or unattended lines without manual checks. The L-type regulator tops out at 0.4 MPa, so confirm your system never needs more than that; the included bracket simplifies mounting, and the missing gauge means you must add one via the 1/4in connection if you need to read set pressure. For lines that require oil downstream, order the matching GAFC500-20 combination instead of this unit. A 1.0 MPa max supply leaves about 0.6 MPa above the 0.4 MPa top of the range, giving ample inlet margin for stable regulation.
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 GAFR500C20ALN FAQ
This filter & regulator has a 3/4in port, a working 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, holds 108 cc in the drain bowl, and weighs 950 g. The automatic drain clears condensate, and the 40 um element filters solid particles.
The L code sets the regulator to a lower band of 0.15-0.4 MPa (20-58 psi), which suits applications that only need modest pressure and benefit from finer adjustment within that range. The N code means no gauge is supplied; you can add one through the 1/4in gauge connection if you need to monitor the outlet pressure.
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