Airtac GAFR Adjustable Filter Regulator GAFR50020ALJK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALJK 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 gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020ALJK
The GAFR50020ALJK combines an air filter and a pressure regulator in a single body, so it cleans incoming air and locks the outlet pressure without a separate filter-regulator train. This 3/4in unit runs on the lower-pressure type, regulating from 0.15 to 0.4 MPa (20-58 psi), and uses a 40 um element to trap solid particles.
A diversion structure spins the air to separate liquid water and drop it into the 108 cc drain bowl, while the pressed-in self-locking knob resists set-pressure drift from vibration. The automatic drain clears condensate without manual attention, and the circular gauge with clip and magnifier shows the outlet pressure on an MPa/psi scale.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALJK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALJK |
|---|---|
| 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. 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 GAFR50020ALJK
| 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. |
| (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 GAFR50020ALJK Is Used
Machine header supply
Feed a multi-station machine header on a 3/4in line where steady lower pressure protects sensitive tooling and the automatic drain keeps condensate from reaching downstream valves.
Lower-pressure test rig
Run a test bench that needs a regulated 0.15-0.4 MPa band for component checks; the balanced regulator holds the setpoint as supply varies, and the gauge gives a clear readout.
Panel-mounted process skid
Mount this filter-regulator on a process skid with an existing bracket, using the 3/4in port to supply a bank of pneumatic actuators that must not see pressure above 0.4 MPa.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALJK the Right Air-Prep Unit?
Choose the GAFR500 for a 3/4in line where a GAFR400 at 3/8in or 1/2in would be undersized; the 500's flow envelope is plotted to 8000 L/min at 0.7 MPa inlet, against 7000 L/min for the 400. The PC bowl suits standard shop-air duty, the automatic drain handles wet or unattended lines, and the J code means no mounting bracket is supplied, so plan a panel mount or existing bracket. A 40 um element is the default; the K suffix adds a reverse-flow (reflux) valve as an ordering difference, and the PT thread carries an MPa/psi gauge scale. If the line needs oil downstream, order the matching GAFC500-20 combination instead of this unit. Note that 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 GAFR50020ALJK 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), and a proof pressure of 1.5 MPa (215 psi). It operates from -5 to 70 C and must not freeze. The drain bowl holds 108 cc and the unit weighs 950 g.
The L code sets the regulated band to 0.15-0.4 MPa, which suits applications that must never exceed that ceiling; the J code omits the mounting bracket for panel-mount or existing bracket setups. The K suffix adds a reverse-flow (reflux) valve, which is an ordering difference.
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