The AirTAC GR30008LJNTK AirTAC Air Regulator, Low-Pressure, 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, ordered without a 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 GR30008LJNTK is an AirTAC GR300 air pressure regulator in the low-pressure type, built for lines that must run well below normal shop-air settings: its adjustment range tops out at 0.4 MPa. It takes a 1/4 in NPT port, tolerates up to 1.0 MPa (145 psi) at the inlet, and operates from -20 to 70 C, the widest temperature window in the G family. A reverse/check valve is fitted, so downstream pressure is held if the upstream supply drops. No pressure gauge is fitted and no mounting bracket is included; the GR body is also panel-mountable.
This is a genuine AirTAC part. The GR series spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in standard or low-pressure types, with optional gauges, brackets, reverse valves and PT, G or NPT threads. 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 | GR30008LJNTK AirTAC Air Regulator, Low-Pressure, 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 | Not fitted |
| 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 air-assisted atomisers on a finishing line often run at reduced pressure to control droplet size. This low-pressure GR300 regulator holds a setpoint up to 0.4 MPa on a 1/4 in drop from the booth's air drop, and the fitted check valve keeps the setting stable if the main supply dips.
Pneumatic clamps and hold-downs on a carton or bag packaging machine need a steady, moderate pressure so parts are gripped without crushing. Fed from the machine's 1/4 in NPT air manifold, this regulator sets that circuit independently of the main header, and the reverse valve stops the clamps relaxing during a supply dropout.
Laboratory test benches and small pilot rigs frequently need compressed air trimmed to a gentle, repeatable pressure for purging, agitation or actuating small cylinders. Mounted at the bench on a 1/4 in line, this regulator gives fine control up to 0.4 MPa and tolerates the -20 to 70 C span of an unheated lab or plant room.
Start with the port step: this unit is size 300 with a 1/4 in NPT port; the GR series steps through 1/8, 1/4, 3/8, 1/2, 3/4 and 1 in across sizes 200 to 600, and the larger the size the more flow the body passes. Choose the low-pressure type (L) only when your setpoint stays at or below 0.4 MPa; the standard GR covers up to 0.9 MPa. This code carries the T thread (NPT); PT is the standard offering and G (BSPP) is also a catalogue option. Gauges, brackets and the reverse/check valve (K) are decodable choices, so order the suffix that matches your panel.
One honest note on sizing: GR flow is published as pressure-loss curves, not a single rated number, so we cannot quote a rated flow here. Send us your line pressure, setpoint and expected air demand and we will confirm the right size against the datasheet curves 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 flow as pressure-loss curves rather than a single rated figure, so there is no one rated flow number we can honestly quote. Tell us your inlet pressure, setpoint and the air demand of the equipment, and we will confirm the sizing against the datasheet curves on request before you order.
L marks the low-pressure type, whose adjustment range tops out at 0.4 MPa instead of the standard GR range, and K means a reverse/check valve is fitted so downstream pressure is held on supply loss. This particular code has no gauge and no bracket; gauges (round or square, with MPa, psi or bar scales) and mounting brackets are available as catalogue options on other GR codes, and PT is the standard thread with G and NPT as orderable choices.
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.