The AirTAC GR30015LJC3T AirTAC Air 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 GR30015LJC3T is an AirTAC GR300 air pressure regulator, built for one job only: holding a steady downstream air pressure. This is the low-pressure (L) type, so the outlet can be set anywhere up to 0.4 MPa, while the inlet accepts up to 1.0 MPa (145 psi). It decodes to NPT1/2 (1/2 in) ports with the T thread suffix, and the C3 suffix means an external round gauge scaled in bar is fitted so the set pressure is visible at the panel. As a J-code unit it comes without a mounting bracket, and being a GR it carries no filter, no bowl and no drain - regulation only. Its -20 to 70 C operating range is wider than the rest of the G family, which suits colder installations.
This is a genuine AirTAC part. The GR family runs in four sizes (200, 300, 400, 600) with ports from 1/8 in to 1 in, and options include standard or low-pressure regulation, gauge type and scale (MPa, psi or bar), a reverse/check valve, bracket or no bracket, and PT, G or NPT threads. Flow for this series 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 | GR30015LJC3T AirTAC Air 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 — round, bar scale |
| Reflux valve | Not fitted |
| 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). |
| C | Gauge shape: Round. 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. |
| (blank) | No reverse-flow valve (the default). |
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 carton sealing or case packing machine, clamp cylinders that must press gently are best fed from a regulator set well below the main line pressure. This low-pressure GR300 holds the reduced setting on 1/2 in lines feeding the clamp circuit, with the bar gauge letting operators verify the set point at the panel.
Test benches and lab manifolds often need a stable, modest supply pressure rather than full shop air. Fitted on the 1/2 in bench feed, this regulator steps the incoming line down to the low set point the process requires, and the round bar gauge gives a direct local reading during setup and runs.
Cooling and product-blowing headers in a plant are usually run at a fraction of header pressure to avoid disturbing the product. Mounted at the take-off on a 1/2 in branch, this low-pressure regulator holds that reduced setting steadily, and its wide -20 to 70 C range suits unheated corners of the plant.
Start with the port step: GR300 in 1/2 in (NPT here) sits mid-range in the family, and the right size is the one whose flow curve covers your air demand at an acceptable pressure drop - we can check that against the curves before you order. Choose the low-pressure (L) type when your set point must stay at or below 0.4 MPa; the standard GR type covers the full 0.05-0.9 MPa range. This unit is ordered with the round external gauge on a bar scale; square embedded gauges and MPa or psi scales are the other catalogue choices. Thread is NPT on this code, with PT (standard) and G available as order options. J means no bracket - add the bracket suffix if you want panel or surface mounting, or use the GR's panel-mount capability directly. A reverse/check valve (K) can be specified if the downstream circuit needs one.
Quick checklist
Without a reflux valve, air cannot flow back through the regulator — order the K option if reverse flow is required. A regulator does not remove water or particulate; that is the filter's job.
AirTAC publishes GR-series flow as curves, not as a single rated number, so there is no one l/min or SCFM figure we can honestly quote. Send us your line size, inlet pressure and air demand, and we will confirm the sizing against the datasheet curves on request before you order.
The L in the code GR30015LJC3T marks the low-pressure version: its outlet is adjustable up to 0.4 MPa instead of the standard GR range of 0.05-0.9 MPa. Choose it when your set point is always low; if you need settings above 0.4 MPa, the standard GR300 in the same 1/2 in port is the catalogue alternative.
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.