Airtac GAFR Adjustable Filter Regulator GAFR50020LJW
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020LJW 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 5 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 grade5 µm
- Bowl materialPC
- Drainsemi-auto + manual
- Pressure gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020LJW
The GAFR50020LJW is a filter and regulator combined into a single body, handling both air preparation steps without the need for separate units. This 3/4in version operates in the lower pressure band of 0.15-0.4 MPa (20-58 psi) and comes with a 5 um element for finer particle removal.
Its 108 cc condensate bowl and 950 g mass place it in the mid-large size class, suitable for machine headers or multi-station lines. The pressed-in self-locking knob resists set-pressure drift from vibration, keeping the outlet steady during operation.
Airtac GAFR Adjustable Filter Regulator GAFR50020LJW Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020LJW |
|---|---|
| Series | GAFR500 filter & regulator |
| Port size | 3/4" (PT thread) |
| Filtering grade | 5 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 | 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 GAFR50020LJW
| 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). |
| J | No bracket (J) — supplied without the mounting bracket. |
| (blank) | Circular pressure gauge fitted. |
| W | Filtering grade 5 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 GAFR50020LJW Is Used
Machine header supply
Feed a 3/4in header serving multiple pneumatic actuators on a production machine, with the 5 um element protecting precision valves from fine wear particles.
Instrument air branch
Supply a clean, regulated 0.15-0.4 MPa branch to gauges or sensors where finer filtration prevents orifice clogging and the lower pressure band matches the instrument spec.
Test bench setup
Use on a test bench where a stable lower regulated pressure is needed for calibration fixtures, with the semi-auto drain allowing quick manual purging between tests.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020LJW the Right Air-Prep Unit?
Choose the GAFR500 body when you need a 3/4in port and a flow envelope plotted to 8000 L/min at 0.7 MPa inlet, stepping up from the GAFR400's 7000 L/min envelope. The PC bowl (blank code) suits general industrial use, while the 5 um element (W) traps finer particles for sensitive equipment. This model has the semi-auto plus manual drain (blank) and includes no mounting bracket (J), so plan for a panel mount or existing bracket. The gauge is fitted with an MPa/psi scale, and the PT thread matches common local piping. If your line needs oil downstream, order the matching GAFC500-20 combination instead. 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 GAFR50020LJW 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. It has a 3/4in port, 5 um element, and a fitted gauge with MPa/psi scale.
The J code omits the mounting bracket, which is included by default on other versions. This is for installations using an existing panel mount or a custom frame. The 950 g weight means the unit should be supported by a proper bracket, not by the tubing alone.
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