The AirTAC AirTAC GR30010LJNTK Regulator NPT3/8 Low-Pressure Type 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 PT3/8" 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 GR30010LJNTK is an AirTAC GR-series air pressure regulator: it does one job, holding downstream pressure steady, and it carries no filter, no bowl and no lubricator. This 300-size unit is ordered with a 3/8 in NPT thread, and it is the low-pressure type, so its adjustment range tops out at 0.4 MPa for circuits that must never see full-line pressure. A reverse (check) valve is fitted, allowing downstream pressure to be held if the upstream supply is lost, and the code confirms no gauge and no mounting bracket are supplied. Maximum inlet pressure is 1.0 MPa (145 psi), and the working temperature range is -20 to 70 C, wider than the rest of the G family.
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 PT (standard), G or NPT thread, with standard or low-pressure regulation, optional gauge, optional bracket and an optional reverse valve. Flow for any GR size is published as a curve rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | AirTAC GR30010LJNTK Regulator NPT3/8 Low-Pressure Type |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT3/8" (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. |
|---|---|
| 10 | Port size PT3/8". 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 · PT3/8" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
Soft clamps and hold-downs on a carton sealing line need a pressure ceiling well below full line supply. The low-pressure type caps adjustment at 0.4 MPa, and the fitted check valve helps the circuit hold its setting if upstream supply dips.
Spray guns and atomising air on a finishing line need a steady, moderate pressure held constant through the shift. A dedicated GR regulator at each booth station keeps gun supply pressure stable without filtering or lubrication duties mixed in.
Positioners and pneumatic pilot stages on a process skid need a trimmed, low-pressure supply independent of the main header. A panel-mounted GR300 regulator gives operators a fixed, repeatable pilot setting, with the check valve guarding the pilot circuit.
Start with the port step: 300 size covers 3/8 in here, and stepping up to 400 or 600 gives larger ports and more flow capacity, while 200 suits smaller lines. Choose the type by ceiling pressure: this low-pressure (L) variant adjusts up to 0.4 MPa; the standard type covers 0.05-0.9 MPa. The K code adds a reverse/check valve, useful where a controlled circuit must hold its setting if supply pressure drops. Thread is NPT here; PT is the catalogue standard and G is also available. A gauge (round or square, MPa, psi or bar scale) and a mounting bracket are order options and are not included in this code. GR is also panel-mountable. Because flow is published as curves rather than a single rating, ask us to confirm sizing against your application before ordering.
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 curves, not as a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your line size and required downstream flow and we will confirm the datasheet curve figures for this 300-size, 3/8 in NPT regulator on request before you order.
L is the low-pressure type, so adjustment tops out at 0.4 MPa instead of the standard 0.05-0.9 MPa range. N means no gauge is supplied (a round or square gauge in MPa, psi or bar scale is an order option), and K means a reverse/check valve is fitted. J confirms no mounting bracket is included, though GR is also panel-mountable.
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.