Airtac GAFR Adjustable Filter Regulator GAFR50020ALK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020ALK 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 GAFR50020ALK
The GAFR50020ALK is a filter and regulator combined into a single body, handling both air cleaning and pressure stabilization in one compact unit. It serves a 3/4in line with a lower-pressure range of 0.15-0.4 MPa (20-58 psi) and uses a 40 um element to trap solid particles.
This model includes a circular gauge with an MPa/psi scale, an automatic drain, and a reverse-flow valve fitted. The pressed-in self-locking knob resists drift from vibration, while the diversion structure spins incoming air to separate liquid water and solids into the 108 cc condensate bowl.
Airtac GAFR Adjustable Filter Regulator GAFR50020ALK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020ALK |
|---|---|
| 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 | Included |
| 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 GAFR50020ALK
| 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. |
| (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 GAFR50020ALK Is Used
Precision valve control
Feed a bank of precision pneumatic valves on a machine tool with regulated air at a stable lower pressure, protecting sensitive components from supply fluctuations.
Conveyor tensioning
Maintain a steady lower pressure for conveyor belt tensioning cylinders, ensuring consistent operation without over-pressurizing the system.
Assembly line stations
Supply filtered air to multiple assembly stations from a single 3/4in header, with the automatic drain reducing maintenance in a busy production environment.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020ALK the Right Air-Prep Unit?
Choose the GAFR500 body for a 3/4in port with a 950 g mass, placing it above the GAFR400 (880 g, 3/8in-1/2in) and below the GAFR600 (1880 g, 3/4in-1in) in the size range. The PC bowl is the standard build choice, and the automatic drain suits unattended lines where manual draining is impractical. The L-type pressure range tops out at 0.4 MPa, so confirm your system never needs more than that. The mounting bracket is included, and the 40 um element is the standard filtration grade. The fitted gauge reads MPa/psi, and the reverse-flow valve is present as an ordering difference. 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 GAFR50020ALK FAQ
The GAFR50020ALK is a filter & regulator with a 3/4in port, working pressure range of 0.15-0.4 MPa (20-58 psi), max pressure of 1.0 MPa (145 psi), and proof pressure of 1.5 MPa (215 psi). It operates in temperatures from -5 to 70 C, has a 108 cc drain bowl, and weighs 950 g. The unit features a 40 um element and an automatic drain.
The reverse-flow (reflux) valve is fitted on this model as an ordering difference. Its specific function is detailed in the catalogue, but it is included as part of the GAFR50020ALK configuration. This unit does not include a lubricator; if you need oil downstream, consider the GAFC500-20 combination.
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