Airtac GAFR Adjustable Filter Regulator GAFR500C20SK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500C20SK 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 - 0.9 MPa (20 - 130 psi). It has no lubricator, so it adds no oil to the airflow.
- TypeFilter & regulator
- Port size3/4"
- Pressure range0.15 - 0.9 MPa (20 - 130 psi)
- Filtering grade40 µm
- Bowl materialMetal
- Drainsemi-auto + manual
- Pressure gaugeCircular, MPa / psi
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500C20SK
The GAFR500C20SK is a filter and regulator combined into a single body, handling both filtration and pressure control without needing separate components. This 3/4in version operates from 0.15 to 0.9 MPa (20-130 psi) with a 40 um element, and its metal bowl holds 108 cc of condensate.
A diversion structure spins incoming air to separate liquid water and solid particles before regulation. The balanced, self-locking regulator keeps the outlet pressure steady as supply varies, and the pressed-in knob resists drift from vibration. With a 950 g mass, this unit requires proper panel or frame mounting rather than support from the tubing.
Airtac GAFR Adjustable Filter Regulator GAFR500C20SK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500C20SK |
|---|---|
| Series | GAFR500 filter & regulator |
| Port size | 3/4" (PT thread) |
| Filtering grade | 40 µm |
| Pressure range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Type | Standard |
| Bowl material | Metal |
| 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 GAFR500C20SK
| GAFR500 | GA500 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| C | Bowl material: Metal. 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. |
| S | Standard type — 0.15 - 0.9 MPa (20 - 130 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 GAFR500C20SK Is Used
Machine tool header
Feed a 3/4in header serving multiple machine tools with filtered, regulated air. The 108 cc bowl handles condensate from continuous operation, and the self-locking knob keeps the setpoint stable despite machine vibration.
Assembly line stations
Supply a multi-station assembly line where consistent pressure is needed for pneumatic actuators and clamping fixtures. The balanced regulator holds outlet pressure steady as upstream supply fluctuates.
Paint booth air supply
Provide clean, regulated air to paint spray equipment where water and solid contamination must be removed. The diversion filter separates liquid and particles before the air reaches the regulator stage.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500C20SK the Right Air-Prep Unit?
Choose the GAFR500 for 3/4in lines where the 108 cc metal bowl and 8000 L/min flow envelope (plotted at 0.7 MPa inlet) suit medium-to-large machine headers. The metal bowl is the only option on this body, and the standard type covers the full 0.15-0.9 MPa range. This model includes the mounting bracket and a circular gauge with MPa/psi scale, while the semi-auto plus manual drain gives both automatic condensate release and a manual override. The 40 um element handles general workshop air, and the PT thread matches standard local fittings. The reverse-flow (reflux) valve is fitted as an ordering difference. If oil is needed downstream, order the matching GAFC500-20 combination instead. With a 1.0 MPa max supply, you have about 0.1 MPa above the 0.9 MPa top of the regulated 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 GAFR500C20SK FAQ
The GAFR500C20SK is a filter & regulator with a 3/4in port, working pressure range of 0.15-0.9 MPa (20-130 psi), max pressure of 1.0 MPa (145 psi), and proof pressure of 1.5 MPa (215 psi). It operates from -5 to 70 C and must not freeze. The metal drain bowl holds 108 cc and the unit weighs 950 g. It comes with a 40 um element and a circular gauge with MPa/psi scale.
The K code indicates the reverse-flow (reflux) valve is fitted to this GAFR500C20SK. It is an ordering difference from models without the K suffix. The catalogue defers the detailed function of this valve to a separate page, so refer to the official AirTAC documentation for its operating principle.
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