Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJ
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJ 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 GAFR500N20ALJ
The GAFR500N20ALJ is a filter and regulator combined into a single body, handling both filtration and pressure control without a separate lubricator. This 3/4in unit operates in the lower pressure band of 0.15-0.4 MPa (20-58 psi) and comes with a 40 um element.
The nylon bowl collects condensate from the diversion-style filtration, while the automatic drain clears it without manual attention. A circular gauge with MPa/psi scale is fitted, and the pressed-in self-locking knob holds the set pressure steady against vibration.
Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJ Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJ |
|---|---|
| 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 GAFR500N20ALJ
| 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. |
| (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 GAFR500N20ALJ Is Used
Low-pressure precision circuits
Feed a sensitive pneumatic control loop that must stay below 0.4 MPa. The lower-pressure regulator type and 40 um filtration protect small precision valves from both over-pressure and particle wear.
Machine header supply
Supply a 3/4in machine header feeding multiple actuators. The 108 cc drain bowl and automatic drain handle condensate from a wet compressor line, while the 950 g body needs a proper frame mount.
Panel-mounted installations
Mount directly to an existing panel using the port threads, since the J code omits the bracket. The circular gauge with magnifier lets operators read set pressure at a glance.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJ the Right Air-Prep Unit?
Choose this GAFR500 when you need 3/4in ports and a 108 cc drain bowl, which holds roughly 1.8x the condensate of a GAFR400's 100 cc bowl. The nylon bowl suits applications where a metal bowl is over-specified, though the common 1.0 MPa maximum applies to all materials. The automatic drain (A) handles wet lines or unattended operation, while the missing bracket (J) suits panel mounting. The lower pressure type (L) tops out at 0.4 MPa, so verify your system never needs more. The 40 um element is the standard grade, and the PT thread gives an MPa/psi gauge scale. 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 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 GAFR500N20ALJ FAQ
Working pressure range is 0.15-0.4 MPa (20-58 psi). Maximum pressure is 1.0 MPa (145 psi) and proof pressure is 1.5 MPa (215 psi). Temperature range is -5 to 70 C. The drain bowl holds 108 cc and the unit weighs 950 g with a 3/4in port.
The L type is designed for applications that never need more than 0.4 MPa outlet pressure. This gives finer adjustment resolution within that band. If your system might require up to 0.9 MPa, choose the standard S type instead.
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