Airtac GAFR Adjustable Filter Regulator GAFR50020LJ
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020LJ 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 gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020LJ
The GAFR50020LJ is a filter and regulator combined in one body, handling both filtration and pressure control without a separate lubricator. It uses a 3/4in port and weighs 950 g, placing it in the mid-large size class for machine headers or multi-station lines.
This lower-pressure version regulates from 0.15 to 0.4 MPa (20-58 psi) with a 40 um element. The 108 cc condensate bowl collects separated water and solids, and the unit includes both semi-auto and manual drains for flexible servicing.
Airtac GAFR Adjustable Filter Regulator GAFR50020LJ Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020LJ |
|---|---|
| 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 | 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 GAFR50020LJ
| 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. |
| (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 GAFR50020LJ Is Used
Machine header supply
Feed a single machine header that needs filtered air at a stable low pressure, with the 3/4in port matching typical header piping.
Multi-station line
Supply several workstations on one line where each station has its own local regulation, relying on the 108 cc bowl to reduce drain frequency.
Low-pressure process
Run a process that requires a gentle 0.15-0.4 MPa supply, using the balanced regulator to hold the set pressure as the inlet varies.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020LJ the Right Air-Prep Unit?
Choose this GAFR500 body when you need 3/4in ports and a 950 g unit that suits a machine header or a multi-station line. The lower-pressure L type tops out at 0.4 MPa, so confirm your system never needs more than that. The PC bowl is the standard build, and the 40 um element handles general workshop air. The J code means no mounting bracket is included, so plan for a panel mount or an existing bracket. A circular gauge with MPa/psi scale is fitted, and the PT thread matches common local fittings. If you need oil downstream, order the GAFC500-20 combination instead of this unit. The 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 GAFR50020LJ FAQ
The GAFR50020LJ is a filter & regulator with a 3/4in port, working range 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, a fitted gauge with MPa/psi scale, and semi-auto plus manual drains.
The J code in GAFR50020LJ means the mounting bracket is not included. This suits installations where the unit mounts to an existing panel or frame, or where you already have a bracket from a previous unit. The 950 g weight means you should support it properly rather than letting the tubing hold it.
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