The AirTAC GR30008LJF3TK AirTAC Low-Pressure Regulator NPT1/4 is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.4 MPa (7 - 58 psi) with PT1/4" ports, and ships with a pressure gauge. A regulator does not filter the air — put a GF filter upstream, or use a GFR filter regulator, when water and particulate must also be removed.
The GR30008LJF3TK is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream pressure from your compressed-air supply, and it carries no filter, bowl or lubricator. This specific configuration is the low-pressure type, so its adjustment range tops out at 0.4 MPa - the right choice for circuits that must never see full line pressure. It is built in the GR300 size with a 1/4 in NPT port, and the T in the code confirms the NPT thread option rather than the PT standard. A square pressure gauge with a bar scale is fitted as standard, a reverse/check valve (K) is included to hold the set pressure against upstream loss, and the J code means no mounting bracket is supplied - the GR body is also panel-mountable. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -20 to 70 C, wider than the rest of the G family.
This is a genuine AirTAC part. The GR300 series is one of four sizes (200/300/400/600) with port options from 1/8 in to 1 in, available in standard or low-pressure types, with or without a gauge, bracket or reverse valve, and in PT, G or NPT thread. Flow figures for this series are published as curves rather than a single rated number, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GR30008LJF3TK AirTAC Low-Pressure Regulator NPT1/4 |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (NPT thread) |
| Regulating range | 0.05 - 0.4 MPa (7 - 58 psi) |
| Pressure type | Low-pressure type |
| Bracket | Supplied without bracket |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — square, bar scale |
| Reflux valve | Fitted (reverse flow permitted) |
| Mounting | Panel mounting; optional fixing bracket |
Specifications follow the official AirTAC G-series air-preparation data. Note the GR temperature range is -20 to +70 °C, wider than the other G-series units. A regulator has no bowl and no filter element, so there is no filtering grade. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GR300 | G-series pressure regulator, 300 body — sets the port range. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| L | Low-pressure type — 0.05 - 0.4 MPa (7 - 58 psi). 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. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| K | Reverse-flow (reflux) valve fitted. |
Field order is size, port, type, bracket, gauge, gauge shape, scale, thread, reflux — a blank position takes the default. Example: GR300-08LNK is a 300 body, PT1/4", low-pressure type, no gauge, with 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 rather than from a single rated figure.
| This model | GR300 · PT1/4" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
Delicate product-holding clamps on a carton or tray line need a gentle, repeatable pressure well below main line pressure. This low-pressure regulator caps the setpoint at 0.4 MPa, and the check valve holds the clamp setting if the upstream supply dips.
Bottle-rinse and dry-off air knives run at low, carefully tuned pressures to avoid splashing or damaging labels. A 1/4 in NPT low-pressure regulator with a bar-scale gauge lets the line technician set and read the exact blow-off pressure.
Pneumatic positioners and valve pilots on a process skid need a steady, low reference pressure. The GR300 regulator with NPT threads suits US plant piping, and the -20 to 70 C range covers outdoor instrumentation runs in cold weather.
Start with the port and flow step: the GR300 size with a 1/4 in port sits in the middle of the GR range (200/300/400/600), so step up a size if your line may grow. Because this is the L (low-pressure) type, its setpoint ceiling is 0.4 MPa - if your process needs to regulate up to 0.9 MPa, choose the standard type instead. The fitted square gauge reads in bar; MPa and psi scales are the other catalogue options. Thread is NPT here, but PT is the standard and G is also available to order. The K code adds a reverse/check valve, useful where upstream supply can drop out, and the J code omits the bracket - order a bracketed variant if you need panel or surface mounting. Flow for this series is published as curves, not a single rating, so send us your application details and we will confirm sizing against the datasheet before you order.
Quick checklist
The reflux valve lets air flow back through the regulator, which is useful when downstream volume must vent quickly. A regulator does not remove water or particulate; that is the filter's job.
We do not quote a single rated flow number for this regulator because AirTAC publishes flow for the GR series as curves, not as one figure. Send us your inlet pressure, set pressure and expected air demand, and we will confirm the datasheet curve figures for your application on request before you order.
The L in the code marks the low-pressure type, whose adjustment range tops out at 0.4 MPa - ideal where the circuit must never see full line pressure. If you need to regulate up to 0.9 MPa, the standard GR300 type in the same size and NPT1/4 port is the catalogue alternative; we can confirm the right variant for your setpoint on request.
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.