The AirTAC GR30008LJC3TK 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 GR30008LJC3TK is an AirTAC GR300 air pressure regulator in the low-pressure type, built purely for pressure regulation - it contains no filter, no bowl and no lubricator. This configuration is set up for 1/4 in NPT ports, with a maximum outlet setting of up to 0.4 MPa, making it the right choice where the downstream circuit must run well below full line pressure. It comes fitted with an external round gauge scaled in bar, and a reverse (check) valve is built in so downstream pressure is held if the upstream supply drops. No mounting bracket is included with this code; the GR body is also panel-mountable.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600, with port options from 1/8 in to 1 in and G (BSPP) or NPT threads as order options alongside the PT standard. GR units are rated for a maximum inlet pressure of 1.0 MPa (145 psi) and operate from -20 to 70 C - a wider temperature window than the rest of the G-series. 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 | GR30008LJC3TK 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 — 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. |
|---|---|
| 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). |
| 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 · PT1/4" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
Where a packaging line's clamp or hold-down cylinders are specified to run at reduced pressure, this low-pressure GR300 regulator holds the outlet setting below 0.4 MPa, with the built-in check valve keeping the circuit stable if supply pressure dips.
Spray and coating setups that call for a gentle, controlled air feed can take their supply through this 1/4 in NPT regulator, with the bar-scaled round gauge giving the operator a clear local reading at the point of use.
Labelling heads, pushers and diverters that must not slam benefit from a dedicated low-pressure branch: this GR300 regulator sets the reduced pressure for that branch independently of the main header, panel-mounted or line-mounted as the machine allows.
Start with the port step: GR300 carries 1/4 in ports, and the larger 400 and 600 sizes open up more flow - match the size to your air demand rather than the pipe alone. This code is the L (low-pressure) type, limited to a 0.4 MPa outlet setting; if your circuit needs the full 0.05-0.9 MPa range, choose a standard GR instead. The round gauge here is scaled in bar; square embedded gauges and MPa or psi scales are the other catalogue choices. Thread is NPT on this unit, with PT as the standard and G (BSPP) available to order. The K code adds a reverse/check valve, and J means no bracket - order a bracketed code if you want one supplied.
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 here. Send us your application details and we will confirm the 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.
AirTAC publishes GR-series flow as performance curves rather than a single rated figure, so we do not state a flow number here. Tell us your application - inlet pressure, downstream demand and acceptable pressure drop - and we will confirm the relevant datasheet figures for this 1/4 in GR300 unit on request before you order.
The L in the code GR30008LJC3TK marks the low-pressure type, whose outlet setting goes up to 0.4 MPa - suited to circuits that must run well below main line pressure. If your application needs the standard GR range of 0.05-0.9 MPa, order a GR300 code without the L position. The inlet rating is 1.0 MPa (145 psi) either way.
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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.