Airtac GAFR Adjustable Filter Regulator GAFR50020ALJNK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALJNK 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 GAFR50020ALJNK
The GAFR50020ALJNK is a filter and regulator combined into a single body, handling both filtration and pressure control without a separate lubricator. This 3/4in unit operates in the lower pressure band of 0.15-0.4 MPa (20-58 psi) and uses a standard 40 um element to capture particulates.
The diversion structure inside spins the incoming air to separate liquid water and solid debris into the 108 cc condensate bowl. Weighing 950 g, this size class needs a proper panel or frame mount rather than support from the tubing alone, especially when compared to the lighter GAFR300 at 500 g.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALJNK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALJNK |
|---|---|
| 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 GAFR50020ALJNK
| 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. |
| K | Reverse-flow (reflux) valve attached. |
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 GAFR50020ALJNK Is Used
Precision valve control
Feed a bank of precision pneumatic valves that require stable lower pressure regulation. The balanced mechanism holds the outlet steady as supply pressure varies, and the 40 um element protects sensitive internals.
Machine tool coolant lines
Supply filtered air to machine tool coolant actuators where the lower pressure range prevents over-pressurization. The automatic drain keeps the 108 cc bowl clear during extended production runs.
Conveyor tensioning stations
Maintain consistent tension on conveyor belt systems with the 3/4in port delivering adequate flow. The self-locking knob resists drift from vibration, keeping the set pressure stable.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALJNK the Right Air-Prep Unit?
Choose this GAFR500 body when you need a 3/4in port with a 108 cc drain bowl and a flow envelope plotted to 8000 L/min at 0.7 MPa inlet. The L type limits the regulated range to 0.15-0.4 MPa (20-58 psi), so verify your system never requires more than 0.4 MPa. The automatic drain (A) handles condensate without manual intervention, while the J code means no mounting bracket is included. No gauge is fitted (N), but the 1/4in gauge connection allows adding one later. The K code indicates a reverse-flow (reflux) valve is attached. If lubrication is needed 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.
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 GAFR50020ALJNK FAQ
The GAFR50020ALJNK operates in the lower pressure range of 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 uses a 40 um element and has a 3/4in port.
The J code omits the mounting bracket for installations using existing brackets or panel mounts. The N code means no gauge is supplied, but the 1/4in gauge connection allows adding one. This configuration suits buyers who already have gauges or prefer to source them separately.
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