Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJNK
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJNK 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 materialMetal
- Drainautomatic
- Pressure gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJNK
The GAFR500C20ALJNK is a filter & regulator with both functions in one body, so it replaces a separate GAF filter plus a GAR regulator with a single unit that has fewer joints to seal. This 3/4in version carries a 950 g mass, uses a metal bowl, and is rated for 0.15-0.4 MPa (20-58 psi) with a 40 um element.
The diversion structure spins the air to separate liquid water and trap solid particles into the 108 cc condensate bowl, while the balanced regulator holds the outlet steady as supply pressure varies. The pressed-in self-locking knob resists set-pressure drift from vibration, and the automatic drain clears condensate without manual attention.
Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJNK Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJNK |
|---|---|
| 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 | Metal |
| 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. No gauge is supplied with this model — the gauge connection on a GAFR500 is 1/4" if you add one. This unit filters and regulates only; it does not add lubrication.
Model Code: Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJNK
| 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". |
| 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. |
| N | No pressure gauge; 1/4" gauge connection. |
| (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 GAFR500C20ALJNK Is Used
Machine header supply
Feed a multi-station assembly machine header where a steady 0.15-0.4 MPa (20-58 psi) output protects sensitive tooling. The 3/4in port and 950 g body handle the line, while the automatic drain keeps the 108 cc bowl clear during long runs.
Low-pressure precision line
Supply a precision valve station that needs a capped 0.4 MPa regulated output. The balanced regulator holds the set pressure as supply varies, and the 40 um element traps particles before they reach fine orifices.
Panel-mounted process skid
Mount this unit on a process skid frame using existing brackets, since the J code omits the included bracket. The metal bowl and automatic drain suit a skid that runs unattended, and the reverse-flow valve is fitted for the specified flow direction.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500C20ALJNK the Right Air-Prep Unit?
Choose this GAFR500 body for a 3/4in port and a 950 g unit that needs a proper panel or frame mount, not support from the tubing. The metal bowl suits demanding environments, and the automatic drain (A) handles unattended or wet lines. The lower-pressure type (L) tops out at 0.4 MPa, so if the machine may ever need more, L is the wrong part. This model has no bracket (J) and no gauge (N); the gauge connection is 1/4in if one is added later. The 40 um element is standard, and the reverse-flow (reflux) valve (K) is fitted as an ordering difference. If the line needs oil downstream, the matching GAFC500-20 combination adds a lubricator. 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 GAFR500C20ALJNK FAQ
Pressure range is 0.15-0.4 MPa (20-58 psi), max pressure is 1.0 MPa (145 psi), proof pressure is 1.5 MPa (215 psi), temperature range is -5 to 70 C, drain bowl capacity is 108 cc, and weight is 950 g. The port is 3/4in, the element is 40 um, and the drain is automatic.
The L type limits regulation to 0.15-0.4 MPa (20-58 psi) for low-pressure applications, so it is not suitable if the machine may need more. The N code means no gauge is supplied; the gauge connection is 1/4in if one is added later. This model also has no bracket (J) and a metal bowl (C).
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