Airtac GAFR Adjustable Filter Regulator GAFR50020ALN
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALN 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 materialPC
- Drainautomatic
- Pressure gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020ALN
The GAFR50020ALN is a filter and regulator combined into a single body, eliminating the need for separate filter and regulator units. It handles a 3/4in port and delivers a lower pressure range of 0.15-0.4 MPa (20-58 psi) with a 40 um filtering element.
This model features an automatic drain and a 108 cc condensate bowl, making it suitable for applications where regular manual draining is impractical. Weighing 950 g, it is a substantial unit designed for permanent mounting, not for support from the tubing alone.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALN Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALN |
|---|---|
| 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 | PC |
| 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 GAFR50020ALN
| GAFR500 | GA500 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| (blank) | Bowl material: PC. 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 GAFR50020ALN Is Used
Machine Tool Header
Feed a 3/4in header supplying multiple pneumatic actuators on a single machine tool, where a steady, low pressure is critical for consistent clamping force.
Conveyor Tensioning
Maintain a precise, low pressure for a conveyor belt tensioning system, ensuring consistent belt tracking without over-stressing the mechanism.
Low-Pressure Assembly
Provide clean, regulated air at a maximum of 0.4 MPa for delicate assembly operations, such as placing lightweight components or operating soft-touch grippers.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALN the Right Air-Prep Unit?
Choose this GAFR500 for 3/4in port applications needing a compact, combined filter and regulator. The lower pressure type (L) is ideal for precise, low-pressure work, but verify your system never requires more than 0.4 MPa. The automatic drain (A) handles wet or unattended lines, while the included mounting bracket simplifies installation. The absence of a gauge (N) means you must add one via the 1/4in connection to monitor output pressure. For finer filtration, select the 5 um element option (W). If your downstream equipment needs lubrication, order the matching GAFC500-20 combination instead, as this unit does not lubricate. 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 GAFR50020ALN FAQ
This filter & regulator has a 3/4in port and a lower pressure range of 0.15-0.4 MPa (20-58 psi). Maximum supply pressure is 1.0 MPa (145 psi), with a proof pressure of 1.5 MPa (215 psi). It operates in temperatures from -5 to 70 C and has a 108 cc condensate bowl. The unit weighs 950 g.
The GAFR50020ALN is supplied without a pressure gauge. To monitor the outlet pressure, you will need to install a separate gauge into the 1/4in gauge connection port on the unit. This allows you to use a gauge with the specific scale or range you prefer.
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