The AirTAC GR30010LJC1TK AirTAC Low-Pressure Regulator, NPT3/8 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, 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 GR30010LJC1TK is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream air pressure from a variable upstream supply. This unit is the low-pressure type (code L), so its adjustment range is up to 0.4 MPa, and it is built in size 300 with a 3/8 inch NPT port. It carries a round pressure gauge with an MPa scale (code C1) so the set pressure is readable at the unit, and a reverse/check valve (code K) is fitted to help hold the downstream setting if the supply side drops. As a pure regulator it contains no filter and no bowl, so there is no drain to manage and no filtration grade to specify.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, standard or low-pressure regulation, gauge choices and scales, and optional G (BSPP) or NPT threads in place of the PT standard. Flow for this size is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures against your application before you order.
| Model | GR30010LJC1TK AirTAC Low-Pressure Regulator, NPT3/8 |
|---|---|
| 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 | Fitted — round, MPa 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. |
|---|---|
| 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. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 1 | Gauge scale: MPa. 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 |
Packaging machines that close, hold or press with air at modest pressures need a setpoint that stays put through the shift. This low-pressure regulator holds a stable line below 0.4 MPa, and the fitted check valve keeps the clamp circuit's setting if the supply side dips.
Fixture and clamping circuits on CNC workholding often run at reduced pressure to protect the part surface. A size 300 regulator with a 3/8 inch NPT port sits neatly in the pilot line, with the round MPa gauge letting the setter read and verify the clamping pressure directly.
Test benches and lab rigs fed from a shop-air drop frequently need a gentle, low setpoint rather than full line pressure. This unit regulates down to low pressures with a readable gauge, and the check valve helps the rig hold its setting while the operator adjusts upstream valves.
Start with the port step: this unit is size 300 with a 3/8 inch NPT port, so size up or down (200/400/600) if your line runs larger or smaller piping and higher or lower air demand. Choose the regulator type by the pressure you actually need: the standard type covers the full GR range, while this low-pressure type (L) is the right pick when the setpoint stays at or below 0.4 MPa, giving finer practical control in that band. The check valve (K) is worth specifying whenever a dropped supply must not dump your downstream setting. Gauge options are an embedded square gauge or an external round gauge, with MPa, psi or bar scales; this unit has the round gauge reading MPa. Thread is PT as the catalogue standard, with G (BSPP) and NPT as orderable options - this code is the NPT version. A mounting bracket is optional (this code omits it), and GR is also panel-mountable. Flow is published as curves, not a single rating, so send us your application details and we will confirm sizing from 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 flow as curves rather than a single rated figure, so we do not quote a rated l/min, SCFM or Cv number. Tell us your line pressure, set pressure and expected air demand, and we will confirm the sizing from the datasheet curves before you order.
The C1 code on this model specifies the round external gauge with an MPa scale, which is the common scale on Asian-market machines. If your team works in psi or bar, the same GR300 regulator can be ordered with a scale-2 (psi) or scale-3 (bar) gauge instead - just ask and we will decode the right code for you.
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.