The AirTAC GFR400-15LJF2K AirTAC Filter Regulator PT1/2 Low-Pressure is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT1/2" ports, a differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The GFR400-15LJF2K is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 400 unit is built with a PT1/2 (1/2 in) PT thread, the standard 40 um filter element, a differential-pressure drain, a low-pressure regulator type, an embedded square gauge scaled in psi, and a built-in reverse (check) valve. The polycarbonate bowl carries compressed air from -5 to 70 C (non-freezing), with a maximum inlet pressure of 1.0 MPa (145 psi). No mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR family covers sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options across the family include 5 um filtration (code W), automatic or manual drains, gauge style and scale, G or NPT threads, and bracket choices. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR400-15LJF2K AirTAC Filter Regulator PT1/2 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure type |
| Adjusting mechanism | Balanced type |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Drain type | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi scale |
| Reflux valve | Fitted (reverse flow permitted) |
Specifications follow the official AirTAC G-series air-preparation data. The regulating band is set by the drain type: automatic and differential-pressure drains regulate 0.15 - 0.9 MPa, a manual drain regulates 0.05 - 0.9 MPa. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. Air must not freeze in the unit. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GFR400 | G-series filter regulator, 400 body — sets the port range. |
|---|---|
| 15 | Port size PT1/2". This body offers 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT thread. PT is the default; G is BSPP and T is NPT. |
| K | Reverse-flow (reflux) valve fitted. |
Field order is size, port, drain, type, bracket, gauge, shape, scale, grade, thread, reflux — a blank position takes the default. Example: GFR300-08 is a 300 body, PT1/4", differential drain, standard type, bracket included, gauge fitted, 40 µm, PT thread, no reflux valve.
A larger body carries a larger port and holds set pressure better as flow rises. AirTAC publishes flow only as curves, so size the body from your peak demand with headroom. The GFR600 uses an aluminium-alloy bowl; the 200, 300 and 400 bodies use PC.
| This model | GFR400 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
On a cartoning or wrapping line, this filter regulator cleans the plant air supply and holds a steady low regulated pressure to the machine's pneumatic cylinders, with the check valve helping the circuit stay pressurised through brief supply dips.
In a machining cell using pneumatic clamps that must not lose grip when the main header fluctuates, the low-pressure regulator sets the working pressure and the fitted check valve keeps the clamp circuit charged if upstream pressure falls.
In a control panel feeding positioners, air piloted valves and small actuators on a food or beverage line, this unit filters the incoming air, regulates it to the low pressure those devices need, and shows the setpoint on the psi-scaled square gauge.
Start with the port step: size 400 with a PT1/2 (1/2 in) PT thread suits lines plumbed at 1/2 in; step up or down a size if your header is larger or smaller, since port size tracks the flow band of each size. This unit carries the standard 40 um element, which is right for general plant air; choose the 5 um (W) option only if downstream equipment needs finer filtration. The differential-pressure drain is the default and needs no operator attention, while automatic and manual drains are orderable alternatives. The square gauge is scaled in psi here; MPa and bar scales are available. The K code means a reverse (check) valve is fitted, useful where you want the downstream circuit held if supply pressure drops. Thread is PT as standard; G (BSPP) and NPT are catalogue options to order, and this J-coded unit ships without a bracket. Flow for this series is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR series as performance curves rather than a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the flow from the datasheet and check the sizing against your required flow band before you order.
The K in GFR400-15LJF2K means a reverse (check) valve is fitted. It allows downstream pressure to be held when the upstream supply pressure drops, which is useful in clamping, holding or other circuits where losing pressure momentarily would interrupt the process. Configurations without the K code do not include this valve.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity, thread type (PT / G / NPT), gauge scale and destination. We confirm price, availability and lead time — usually within 7-8 hours.