The AirTAC GR30015LJF3TK AirTAC Low-Pressure Regulator NPT1/2 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 PT1/2" 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 GR30015LJF3TK is an AirTAC GR-series air pressure regulator: it does one job, holding a steady downstream pressure from a compressed-air supply. This is the low-pressure type, set up for applications that must not run above the low-pressure regulation ceiling. The code decodes as size 300 with a 1/2 in NPT port, a square pressure gauge reading in bar, a built-in reverse (check) valve so downstream pressure cannot push back through the unit, and no mounting bracket - the GR body is also panel-mountable, so it can be screwed straight to a machine plate or control cabinet.
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 and low-pressure types, with gauge, thread and check-valve options to match. Flow is published as curves rather than a single rating, so if you need a figure for sizing, ask us and we will confirm it from the datasheet on request.
| Model | GR30015LJF3TK AirTAC Low-Pressure Regulator NPT1/2 |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/2" (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. |
|---|---|
| 15 | Port size PT1/2". 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 · PT1/2" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
On a fixture or jig that clamps with air at reduced pressure, this low-pressure GR regulator holds the downstream setting so delicate workpieces are gripped without over-pressure, with the check valve holding the setting against upstream fluctuation.
Spray guns and atomising air lines need a steady, moderate supply pressure. This 1/2 in regulator sits at the booth drop and keeps gun feed pressure stable, with the bar-scale square gauge giving the operator a direct reading at the panel.
Sealing bars, hold-down cylinders and low-pressure actuators on packaging lines run from a reduced-pressure branch. This regulator on the branch line keeps that circuit independent of the main header pressure, panel-mounted beside the machine controls.
Start with the port step: size 300 carries a 1/2 in port, and moving up or down a size changes both the port and the flow path, so match the size to the air demand of the circuit - we can confirm the flow curve against your application before you order. This unit is the low-pressure (L) type, so choose it only where the working pressure must stay within the low-pressure range; the standard GR covers the full adjustment range. The square gauge here reads in bar; MPa and psi scales are the other order options, and an external round gauge is available instead of the embedded square one. Thread is NPT on this code; PT is the standard and G (BSPP) is the alternative order option. The K in the code means a reverse/check valve is fitted - order a code without K if backflow protection is not wanted. Bracket: this code is J (no bracket); blank-code versions include one, and the GR is panel-mountable either way.
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 curves, not as a single rated figure, so we do not quote a number on the page. Tell us your application and air demand and we will confirm the sizing from the datasheet on request before you order.
L marks the low-pressure regulator type, whose adjustment range tops out lower than the standard GR - use it only where the process genuinely runs at reduced pressure. K means a reverse (check) valve is fitted, so downstream pressure cannot push back through the unit. Both are order options: the same size is available as a standard type without the check valve under a different code.
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.