Airtac GAFR Adjustable Filter Regulator GAFR50020ALNWK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALNWK 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
- Drainautomatic
- Pressure gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020ALNWK
The GAFR50020ALNWK is a filter and regulator combined into a single body, so incoming air is cleaned and then set to a steady outlet pressure without needing separate units. This 3/4in version operates in the lower 0.15-0.4 MPa (20-58 psi) band and uses a 5 um element to trap fine particles.
A reverse-flow valve is fitted, and the automatic drain clears condensate without manual attention. The 108 cc bowl collects water and solids spun out by the diversion structure, while the 950 g mass signals a unit that needs a proper panel mount rather than support from the tubing.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALNWK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALNWK |
|---|---|
| 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 | 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 | 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 GAFR50020ALNWK
| 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). |
| (blank) | Mounting bracket included. |
| N | No pressure gauge; 1/4" gauge connection. |
| W | Filtering grade 5 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 GAFR50020ALNWK Is Used
Machine header supply
Feed a 3/4in header serving multiple pneumatic stations on a production line, where the 8000 L/min envelope (at 0.7 MPa inlet) supports simultaneous actuation.
Instrument air prep
Use the 5 um element ahead of precision valves or sensors that need cleaner air, with the automatic drain keeping the bowl from filling during long runs.
Dusty environment filtration
In a warehouse with ambient dust, the diversion structure spins out solids into the 108 cc bowl while the lower pressure range protects sensitive downstream equipment.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALNWK the Right Air-Prep Unit?
Choose the GAFR500 body when you need a 3/4in port and the 8000 L/min flow envelope (plotted at 0.7 MPa inlet) for a machine header or multi-station line. The PC bowl suits general shop air, while the automatic drain handles wet or unattended lines without manual checks. The 5 um element filters finer than the standard 40 um, and the included bracket simplifies mounting; the lower-pressure type tops out at 0.4 MPa, so confirm your system never needs more. The no-gauge version leaves a 1/4in connection if you add one later, and the reflux valve is an ordering difference only. If oil is needed downstream, order the matching GAFC500-20 combination instead. With a 1.0 MPa max supply, you have about 0.6 MPa of headroom above the 0.4 MPa regulated ceiling.
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 GAFR50020ALNWK FAQ
Working pressure is 0.15-0.4 MPa (20-58 psi), max pressure is 1.0 MPa (145 psi), proof pressure is 1.5 MPa (215 psi), and temperature range is -5 to 70 C. The drain bowl holds 108 cc, the unit weighs 950 g, and the flow curve is plotted to 8000 L/min at 0.7 MPa inlet.
The N code after the port means no gauge is supplied, leaving a 1/4in connection if you add one later. The K code indicates a reverse-flow (reflux) valve is fitted, which is an ordering difference; its function is detailed in the catalogue.
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