The AirTAC GR400-10 AirTAC Air Pressure Regulator, NPT3/8, Low-Pressure 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 GR400-10 is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream air pressure, and it does nothing else. This is the low-pressure (L) type in the size 400 body, so its setting range tops out at 0.4 MPa, suited to circuits that must never see full line pressure. It carries 3/8 in NPT ports, tolerates a maximum inlet pressure of 1.0 MPa (145 psi), and works from -20 to 70 C, the widest temperature window in the G family. The N in the code means no gauge is fitted; the J means no mounting bracket, and the GR body can also be panel-mounted. The K suffix adds a reverse (check) valve, so downstream pressure will not back-drive through the unit when the upstream supply is removed.
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 standard and low-pressure types, with or without a gauge, bracket or reverse valve, and in PT, G or NPT thread. Flow for this series is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application before you order.
| Model | GR400-10 AirTAC Air Pressure Regulator, NPT3/8, Low-Pressure |
|---|---|
| Series | GR400 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.
| GR400 | G-series pressure regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 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 | GR400 · PT3/8" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
Adhesive and coating heads on carton and case-packing machines need a gentle, stable air supply. This low-pressure regulator caps the setpoint at 0.4 MPa so the metering circuit cannot be over-driven by the main 1.0 MPa line.
Pipetting and fluid-transfer modules in laboratory automation are sensitive to pressure spikes. The GR400-10 holds a low, steady downstream pressure, and the fitted check valve stops back-flow when the supply is shut off.
Brake and clutch actuators on unwind stands run at modest pressures that must stay constant as rolls change. This regulator, panel-mounted near the control station, keeps the tension circuit steady across the shift.
Start with the port step: this unit is size 400 with 3/8 in NPT ports; step up or down a size when your line runs larger or smaller. Choose the low-pressure (L) type only when your setpoint stays at or below 0.4 MPa; for higher setpoints up to 0.9 MPa use the standard GR type. Decide whether you want a gauge fitted (round or square, MPa, psi or bar scale) or an externally mounted one; this code ships without any gauge. Pick the thread to match your piping: PT is the catalogue standard, with G (BSPP) and NPT as order options. Bracket (J = none) and reverse valve (K = fitted) are the remaining decodable choices. Because GR flow is published as curves and not a single rating, send us your application details and we will confirm 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 number, so there is no one l/min, m3/h or SCFM figure we can honestly quote. Tell us your line pressure, setpoint and expected air demand, and we will confirm the sizing against the datasheet curves on request before you order.
The N in the code GR40010LJNTK means no pressure gauge is fitted. GR regulators can be ordered with an embedded square gauge or an external round gauge, in MPa, psi or bar scale. If you want to read the setpoint locally, ask us for the gauge-equipped variant of the same size and port.
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.