Airtac GAFR Adjustable Filter Regulator GAFR50020ALJN
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALJN 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 GAFR50020ALJN
The GAFR50020ALJN is a filter and pressure regulator combined into a single body, so it cleans incoming air and holds a steady outlet pressure without needing a separate filter plus regulator. This 3/4in version operates in the lower 0.15-0.4 MPa (20-58 psi) band and uses a 40 um element to trap solid particles and spun-out liquid water.
With a 950 g mass and a 108 cc condensate bowl, this unit is built for a machine header or a multi-station line rather than a small jig. The automatic drain clears collected water without manual attention, and the pressed-in self-locking knob resists set-pressure drift from vibration.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALJN Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALJN |
|---|---|
| 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 | Not included (J) |
| 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 GAFR50020ALJN
| 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). |
| J | No bracket (J) — supplied without the mounting bracket. |
| 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 GAFR50020ALJN Is Used
Machine header supply
Feed a 3/4in manifold that distributes air to multiple workstations on an assembly line, where the lower pressure range suits delicate operations.
Instrument air pre-filter
Protect sensitive pneumatic controls and positioners from water and 40 um-scale particles before they reach the precision valves.
Automated test rig
Supply a consistent 0.15-0.4 MPa to a test fixture that cycles cylinders, with the automatic drain keeping the bowl clear during long runs.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALJN the Right Air-Prep Unit?
Choose the GAFR500 body when your line needs a 3/4in port and a flow envelope plotted to 8000 L/min at 0.7 MPa inlet; step down to the GAFR400 for 1/2in ports with a 7000 L/min envelope, or up to the GAFR600 for 1in ports and 12000 L/min. The PC bowl suits general dry indoor use, 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 actuators never need more than that; the J code omits the mounting bracket for panel-mount installations, and the N code means no gauge is supplied - the 1/4in gauge connection is ready if you add one later. The 40 um element is the standard grade; choose the W option for 5 um filtration if you feed precision valves. If your line needs oil downstream, order the matching GAFC500-20 combination instead. A 1.0 MPa max supply leaves about 0.6 MPa above the 0.4 MPa top of the 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 GAFR50020ALJN FAQ
The GAFR50020ALJN is a filter & regulator with a 3/4in port, working pressure 0.15-0.4 MPa (20-58 psi), max pressure 1.0 MPa (145 psi), proof pressure 1.5 MPa (215 psi), temperature range -5 to 70 C, 108 cc drain bowl, and 950 g weight. It has a 40 um element, automatic drain, PC bowl, no bracket, and no gauge.
The N code means no gauge is fitted, so you cannot read the set pressure without adding one to the 1/4in gauge connection. The J code omits the mounting bracket, which suits installations where the unit is panel-mounted or secured by existing hardware.
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