The AirTAC GR30015LJC3TK 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 GR30015LJC3TK is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream pressure from your compressed-air supply. This is the low-pressure (L) type in the GR300 size, set up for 1/2 in NPT ports, with a working range up to 0.4 MPa. It carries a round pressure gauge reading in bar, a reverse/check valve (K) that holds downstream pressure if the upstream supply drops, and no mounting bracket (J) - the GR body is also panel-mountable. Maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature range is -20 to 70 C, wider than the rest of the G family.
This is a genuine AirTAC part. The GR line spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, standard or low-pressure regulation, gauge or no-gauge builds, and PT, G or NPT threads as order options. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before you order.
| Model | GR30015LJC3TK 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 — round, 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). |
| 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. |
| 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 |
Machining fixtures that clamp with low-pressure air need a regulator set well below normal line pressure. The L-type GR300 holds the controlled circuit at up to 0.4 MPa, and the check valve keeps the clamp from venting if the main supply dips mid-cycle.
Looms and textile blowing stations run on gentle, steady air rather than full line pressure. A 1/2 in low-pressure regulator at each station lets operators set the jet pressure once and keeps it stable through the shift, read directly on the bar gauge.
Air-piloted process valves and actuators need a clean, fixed pilot pressure independent of the main header. This GR300 regulator, panel-mounted near the valve bundle, supplies that pilot line at low pressure with the reverse valve holding the pilot signal during supply fluctuations.
Pick the GR size by the air demand of the circuit: 200, 300, 400 and 600 step up in port size and capacity, with this GR300 sitting at 1/2 in. Choose the standard type for normal line pressures or the L type, as here, when the controlled pressure must stay at or below 0.4 MPa. Decide whether you want a gauge (square embedded as standard, or an external round gauge) and its scale in MPa, psi or bar - this unit ships with a round bar gauge. Thread is PT as the catalogue standard, with G and NPT as orderable options; this code is the NPT build. You can also add a reverse/check valve (K, fitted here) and choose bracket or no bracket.
One honest note on sizing: AirTAC publishes GR flow as curves, not as a single rated number, so we do not quote a flow figure. Send us your application details and we will confirm the datasheet curve against your required flow 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-series flow as curves, not as a single rated figure, so we do not quote a flow number for this regulator. Tell us your line pressure, set pressure and required air demand, and we will confirm the datasheet curve and check the GR300 size against your application before you order.
L marks the low-pressure type: its regulated output range goes up to 0.4 MPa, whereas the standard GR type adjusts up to 0.9 MPa. Both share the same 1.0 MPa (145 psi) maximum inlet and the same -20 to 70 C temperature range. Choose L when your downstream equipment must never see more than 0.4 MPa.
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.