The AirTAC GR30008LJF1TK 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 GR30008LJF1TK is an AirTAC GR300 series air pressure regulator for compressed air, built purely for regulation: it reduces and holds a stable downstream pressure with no filtration and no lubrication. This configuration is the low-pressure type, adjustable up to 0.4 MPa, with a 1/4 in NPT port. It comes with the embedded square pressure gauge on an MPa scale, a reverse/check valve fitted to hold downstream pressure, no mounting bracket, and 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.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in standard or low-pressure types, with your choice of gauge scale (MPa, psi or bar), reverse/check valve, bracket, and PT, G or NPT thread as order options. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GR30008LJF1TK 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, MPa 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. |
| 1 | Gauge scale: MPa. 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 |
Spray guns and atomizing headers in a finishing booth run best at reduced, steady pressure. This low-pressure GR regulator holds the setpoint up to 0.4 MPa, and the check valve keeps the gun circuit from losing its setting if shop supply dips mid-coat.
Carton sealing and wrapping machines often need a gentler, regulated air feed for low-pressure actuators and hold-downs. A 1/4 in NPT regulator with a built-in MPa gauge lets the line technician set and verify the reduced pressure at the machine.
Bench-top test rigs and pneumatic instrumentation need clean, stable low-pressure air. This GR300 low-pressure regulator setpoints up to 0.4 MPa, and the fitted check valve stops backfeed into the bench circuit when the main supply is shut off.
Start with the port: this unit is the 300 size with a 1/4 in NPT thread; larger sizes (400, 600) carry larger ports and more flow capacity, so step up if your line draws more air. This is the L low-pressure type, adjustable up to 0.4 MPa - if your process needs up to 0.9 MPa, choose the standard GR type instead. The fitted square gauge reads in MPa; psi and bar scales are available if you prefer. The K code means a reverse/check valve is fitted, useful where downstream pressure must be held if supply dips. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also an order option. No bracket is included with the J code, and the GR body can be panel-mounted.
One honest note on sizing: AirTAC publishes GR flow as curves, not as a single rated number, so we cannot quote you a rated flow figure. Send us your application details and we will confirm the datasheet curve and sizing 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.
AirTAC publishes GR regulator flow as performance curves rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your application - supply pressure, setpoint and air demand - and we will confirm the datasheet curve and check the sizing against your requirement before you order.
The L in the code marks the low-pressure type, adjustable up to 0.4 MPa. If your process needs a higher setpoint, the standard GR300 in the same 1/4 in port adjusts up to 0.9 MPa (7-130 psi range). Both share the same body size, so switching type does not change your plumbing.
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.