Airtac GAFR Adjustable Filter Regulator GAFR50020LN
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020LN 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
- Drainsemi-auto + manual
- Pressure gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020LN
The GAFR50020LN is a filter and regulator combined into one body, handling both filtration and pressure control in a single compact unit. It has no lubricator and only one bowl, the 108 cc condensate bowl, which collects water and solids separated by the diversion structure.
This model uses a 3/4in port and operates in the lower pressure band of 0.15-0.4 MPa (20-58 psi). The standard 40 um element traps particles, while the semi-auto and manual drains give you control over condensate removal. Weighing 950 g, this unit is built for a fixed installation where the piping provides support.
Airtac GAFR Adjustable Filter Regulator GAFR50020LN Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020LN |
|---|---|
| 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 | Semi-auto drain + manual 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 GAFR50020LN
| 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". |
| (blank) | Drain: Semi-auto drain + manual 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 GAFR50020LN Is Used
Machine header supply
Feed a medium-sized machine header with a 3/4in line, using the GAFR50020LN to clean the air and hold a stable lower pressure for downstream pneumatic controls.
Low-pressure test rig
Use this unit in a test rig that requires a precise 0.15-0.4 MPa supply, where the balanced regulator keeps the outlet steady as the shop air pressure fluctuates.
Conveyor control cabinet
Mount the GAFR50020LN in a control cabinet for a conveyor system, where its 108 cc bowl and semi-auto drain handle condensate between scheduled maintenance checks.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020LN the Right Air-Prep Unit?
Choose the GAFR500 body for a 3/4in port with a flow envelope plotted to 8000 L/min at 0.7 MPa inlet, which suits medium-sized machine headers. The PC bowl is the standard choice, and the included mounting bracket simplifies installation on a frame or panel. The semi-auto plus manual drain lets you monitor condensate, while the lower pressure type caps the output at 0.4 MPa, so verify your system never needs more than that. The gauge connection is 1/4in if you add a pressure gauge later, and the PT thread matches common local fittings. If your line requires oil downstream, order the matching GAFC500-20 combination instead. The 1.0 MPa max supply leaves about 0.6 MPa above the 0.4 MPa top of the range, so you have ample inlet pressure for consistent 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 GAFR50020LN FAQ
The GAFR50020LN is a filter and regulator with a 3/4in port, a pressure range of 0.15-0.4 MPa (20-58 psi), and a maximum pressure of 1.0 MPa (145 psi). The proof pressure is 1.5 MPa (215 psi), and the temperature range is -5 to 70 C. It has a 108 cc drain bowl and weighs 950 g.
The L code indicates a lower pressure type, limiting the regulated output to 0.15-0.4 MPa instead of the standard 0.15-0.9 MPa. This suits applications that only need a modest pressure, but if your machine might require more than 0.4 MPa in the future, select the standard S type instead.
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