Airtac GAFR Adjustable Filter Regulator GAFR50020ALJWK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALJWK 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 gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020ALJWK
The GAFR50020ALJWK is a filter and regulator combined in a single body, so it cleans the air and stabilizes downstream pressure without needing separate units. This 3/4in model has a 108 cc condensate bowl and weighs 950 g, placing it in the mid-large size class for machine headers.
It delivers a lower pressure range of 0.15-0.4 MPa (20-58 psi) and uses a 5 um filter element to trap fine particles. The automatic drain clears condensate without manual attention, and the fitted circular gauge shows the outlet pressure on an MPa/psi scale.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALJWK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALJWK |
|---|---|
| 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 | 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 GAFR50020ALJWK
| 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. |
| (blank) | Circular pressure gauge fitted. |
| 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 GAFR50020ALJWK Is Used
Precision valve protection
Feed a bank of precision pneumatic valves that require clean, low-pressure air. The 5 um element stops fine abrasive particles, while the 0.15-0.4 MPa range protects sensitive pilot stages.
Machine header supply
Mount this 3/4in unit on a machine header serving multiple actuators. The 108 cc bowl handles condensate from several branches, and the automatic drain keeps the line running without daily checks.
Low-pressure test rig
Use it on a test bench where you need a stable, low-pressure air supply for calibration or leak testing. The balanced regulator holds the set pressure as the shop supply fluctuates.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALJWK the Right Air-Prep Unit?
Choose this GAFR500 when you need a 3/4in port with a lower 0.15-0.4 MPa output band, ideal for delicate circuits that must not see higher pressures. The 5 um element suits precision valves or instrument air, while the automatic drain handles wet or unattended lines. This unit ships without a mounting bracket (J code), so plan for a panel mount or an existing bracket, and the reverse-flow valve (K) is fitted as an ordering difference. The PC bowl is the standard build; confirm compatibility if your environment is aggressive. If your line also needs lubrication downstream, order the matching GAFC500-20 combination instead. Note that 1.0 MPa max supply leaves about 0.6 MPa above the 0.4 MPa top of the range, so this regulator has ample inlet headroom.
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 GAFR50020ALJWK FAQ
This filter & regulator has a 3/4in port, a lower pressure range of 0.15-0.4 MPa (20-58 psi), a maximum pressure of 1.0 MPa (145 psi), a proof pressure of 1.5 MPa (215 psi), and a temperature range of -5 to 70 C. It has a 108 cc drain bowl, weighs 950 g, and uses a 5 um filter element.
The L code sets the regulated output to 0.15-0.4 MPa, which suits applications that must not exceed 0.4 MPa. The J code means the mounting bracket is omitted, so you need a panel mount or an existing bracket. This unit also has the reverse-flow valve (K) fitted as an ordering difference.
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