Airtac GAFR Adjustable Filter Regulator GAFR50020ALJ
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALJ 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 GAFR50020ALJ
The GAFR50020ALJ is a filter and regulator combined into one body, handling both air preparation tasks without a separate filter and regulator pair. This lower-pressure model operates from 0.15 to 0.4 MPa (20-58 psi) and uses a 40 um element to trap solid particles.
Its 3/4in port and 950 g mass place it in the GAFR500 size class, with the automatic drain clearing the 108 cc condensate bowl without manual attention. The circular gauge with MPa/psi scale is fitted, and the unit's diversion structure spins incoming air to separate liquid water and solids before regulation.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALJ Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALJ |
|---|---|
| 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 GAFR50020ALJ
| 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. |
| (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 GAFR50020ALJ Is Used
Precision valve control
Feed a bank of precision pneumatic valves that require stable, lower pressure below 0.4 MPa, with the automatic drain handling condensate from a moderately wet compressor line.
Machine tool coolant actuation
Supply a machine tool's coolant valve actuators where a 3/4in port matches the header, and the lower pressure range protects sensitive pilot valves from over-pressurization.
Test rig pressure setting
Set a precise low pressure for a test rig that checks component seals at 0.3 MPa, using the fitted gauge to verify the setpoint and the automatic drain to keep the bowl clear during long runs.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALJ the Right Air-Prep Unit?
Choose the GAFR500 body for a 3/4in port and 108 cc drain bowl, stepping down to the GAFR400 if 1/2in ports and a 100 cc bowl suffice. The PC bowl suits general industrial use, while the automatic drain (A) handles wet or unattended lines without manual checks. This L-type regulates only up to 0.4 MPa, so confirm your supply never needs more; the standard S type reaches 0.9 MPa if that changes. The J code omits the mounting bracket for panel-mount installations, and the fitted gauge reads MPa/psi with PT threads. A 5 um element (W) is available for finer filtration, and the K option adds a reverse-flow valve. If oil is needed downstream, order the matching GAFC500-20 combination instead. 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 GAFR50020ALJ FAQ
The GAFR50020ALJ is a filter and regulator with a 3/4in port, regulating from 0.15 to 0.4 MPa (20-58 psi). Maximum pressure is 1.0 MPa (145 psi), proof pressure is 1.5 MPa (215 psi), and the temperature range is -5 to 70 C. It has a 108 cc drain bowl, weighs 950 g, and uses a 40 um element with an automatic drain.
The L code sets the lower pressure range to 0.15-0.4 MPa, which suits applications needing a capped outlet below the standard 0.9 MPa ceiling. The J code omits the mounting bracket, so you must provide your own panel mount or existing bracket; the unit is not supported by tubing alone given its 950 g weight.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Air-Preparation Units
Request a Quote for Airtac GAFR Adjustable Filter Regulator GAFR50020ALJ
Send us the quantity, thread type (PT / G / NPT) and destination. We confirm price, stock and lead time — usually within 7-8 hours.