Airtac GAFR Adjustable Filter Regulator GAFR50020LJK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR50020LJK 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 GAFR50020LJK
The GAFR50020LJK is a filter and regulator combined into a single body, handling both filtration and pressure control without needing separate units. It serves a 3/4in line with a lower-pressure range of 0.15-0.4 MPa (20-58 psi), a 40 um element, and a circular gauge with MPa/psi scale.
This 950 g unit includes a 108 cc condensate bowl and both semi-auto and manual drains, plus a reverse-flow valve fitted as an ordering difference. The balanced regulator holds the outlet steady as supply varies, while the diversion structure spins air to separate liquid water and solid particles into the bowl.
Airtac GAFR Adjustable Filter Regulator GAFR50020LJK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR50020LJK |
|---|---|
| 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 | 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 GAFR50020LJK
| 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). |
| 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 GAFR50020LJK Is Used
Machine header supply
Feed a 3/4in header serving multiple pneumatic stations on a production line, where the lower pressure range protects sensitive equipment from over-pressurization.
Conveyor control cabinet
Regulate air for conveyor control valves in a central cabinet, using the 108 cc bowl to handle condensate over longer shifts between manual drains.
Test rig air preparation
Prepare air for a test rig that requires stable low pressure, with the balanced regulator maintaining setpoint as upstream supply fluctuates.
Is the Airtac GAFR Adjustable Filter Regulator GAFR50020LJK the Right Air-Prep Unit?
Choose the GAFR500 body for a 3/4in port with an 8000 L/min flow envelope plotted at 0.7 MPa inlet, stepping down from the GAFR600's 12000 L/min at 0.7 MPa inlet if you need less capacity. The PC bowl suits standard environments, while the J code means no mounting bracket is included, so plan for panel mounting or existing brackets. This L-type model tops out at 0.4 MPa, so confirm your system never needs more than that; the semi-auto and manual drains are both fitted, and the 40 um element handles general filtration. The PT thread gives an MPa/psi gauge scale, and the K code adds the reverse-flow valve, which is named here as an ordering difference only. If you need lubrication 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 GAFR50020LJK FAQ
The GAFR50020LJK has a pressure range of 0.15-0.4 MPa (20-58 psi), max pressure of 1.0 MPa (145 psi), proof pressure of 1.5 MPa (215 psi), and temperature range of -5 to 70 C. It has a 108 cc drain bowl and weighs 950 g.
The K code indicates a reverse-flow (reflux) valve is fitted. It is an ordering difference only; the catalogue defers its function to a separate page not included in our data.
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Covers non-human-caused product damage.
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