Airtac GAFR Adjustable Filter Regulator GAFR50020LK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020LK 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
- Drainsemi-auto + manual
- Pressure gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR50020LK
The GAFR50020LK is a filter & regulator combining air filtration and pressure regulation in a single body. It handles 3/4" ports and delivers a lower pressure range of 0.15-0.4 MPa (20-58 psi), with a 40 um element for standard filtration. This unit has no lubricator and only one bowl for condensate, keeping the setup compact.
Its 108 cc drain bowl collects water and solids separated by the diversion structure, while the balanced, self-locking regulator maintains a steady outlet as supply pressure varies. Weighing 950 g, this body class suits fixed installations where the piping supports the weight, not the tubing.
Airtac GAFR Adjustable Filter Regulator GAFR50020LK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020LK |
|---|---|
| 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 | Semi-auto drain + manual 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 GAFR50020LK
| 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". |
| (blank) | Drain: Semi-auto drain + manual 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 GAFR50020LK Is Used
Precision pressure setting
Use the GAFR50020LK on a machine station that requires a stable, lower pressure for delicate operations, such as a clamping fixture or a light pressing task.
Dedicated lower-pressure line
Feed a branch line serving low-pressure actuators or air tools where the main supply is higher, relying on the regulator to step down and hold the setting.
Equipment upgrade path
Replace a separate filter and regulator pair on a 3/4" line with this single-body unit, reducing potential leak points and saving space on the rail.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020LK the Right Air-Prep Unit?
Choose the GAFR50020LK for a 3/4" line needing lower regulated pressure, up to 0.4 MPa. The PC bowl suits general-purpose use, and the included bracket simplifies mounting. The semi-auto and manual drains give you control over condensate removal, while the fitted gauge with MPa/psi scale shows the set pressure directly. The 40 um element handles standard shop air, and the reverse-flow (reflux) valve is fitted as an ordering difference. If you need oil 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 GAFR50020LK FAQ
The GAFR50020LK has a pressure range of 0.15-0.4 MPa (20-58 psi), a max pressure of 1.0 MPa (145 psi), and a proof pressure of 1.5 MPa (215 psi). Its temperature range is -5 to 70 C, it has a 108 cc drain bowl, and it weighs 950 g.
The L type limits the regulated output to a maximum of 0.4 MPa, suitable for applications that never require more. The K code indicates a reverse-flow (reflux) valve is fitted; this is an ordering difference, and its specific function is detailed in the catalogue.
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