The AirTAC GR400-10 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 AirTAC GR400-10 is a compressed-air pressure regulator in the 400 size with a 3/8 in NPT port. This is the low-pressure type (code L), so its adjustment range tops out at 0.4 MPa, making it the right choice where downstream equipment must be held at modest working pressure rather than full line pressure. The unit carries a maximum inlet pressure of 1.0 MPa (145 psi), operates in temperatures from -20 to 70 C (the widest temperature window in the G series), and comes with an embedded square gauge scaled in bar; an external round gauge is available as an option. A reverse/check valve (code K) is fitted, so downstream pressure is held if the upstream supply drops, and the mounting bracket is included, with panel mounting also possible.
This is a genuine AirTAC part. The GR family spans four sizes (200, 300, 400, 600) with progressively larger ports and flow capacity, and can be ordered with different thread standards (PT standard; G and NPT as options), gauge scales in MPa, psi or bar, a low-pressure type, a reverse/check valve, and with or without a bracket. Because AirTAC publishes regulator flow as curves rather than a single rated figure, we confirm the exact flow and datasheet figures for your application on request.
| Model | GR400-10 AirTAC Low-Pressure Regulator, NPT3/8 |
|---|---|
| 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 | Fixing bracket included |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — square, 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.
| 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. |
| (blank) | Fixing bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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 | 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 |
Hold pneumatic hold-down clamps at a gentle, repeatable pressure so veneers and soft hardwoods are pressed without bruising. The low-pressure range, bar-scale gauge and check valve keep the clamp force steady through supply dips.
Regulate atomising and blow-off air to a booth's nozzle manifold at low working pressure, read directly off the embedded bar gauge. The check valve stops the manifold back-feeding when the line is shut down.
Supply low-pressure air to capper cylinders and sorting fingers where full line pressure would slam the mechanism. The 3/8 in NPT port and included bracket make it a tidy drop-in regulator beside the conveyor.
Start with the port step: the GR family moves 200 through 600 in port and flow capacity, so pick the size whose curve covers your worst-case air demand rather than sizing to the pipe alone. This GR400-10 is the low-pressure type, limited to 0.4 MPa downstream - only choose it if your process never needs more; otherwise the standard GR covers up to 0.9 MPa. Decide on the gauge scale (MPa, psi or bar) to match the instruments your technicians read, and on the thread standard: PT is the catalogue standard, with G (BSPP) and NPT (this unit) as order options. The bracket is included and GR is also panel-mountable; the fitted reverse/check valve is worth keeping if a dropped supply must not vent your circuit. One honest note: AirTAC publishes regulator flow as curves, not a single rating, so ask us to confirm sizing against your actual air consumption 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 regulator flow as performance curves rather than a single rated figure, so there is no one number we can quote. Send us your application's air demand and we will confirm the flow from the GR400 datasheet curves on request before you order.
The L code means this GR400-10 is the low-pressure version: its downstream adjustment range tops out at 0.4 MPa instead of the standard GR's higher range. Choose it only for circuits that never need more than 0.4 MPa; for higher settings, order the standard type. Maximum inlet pressure is still 1.0 MPa (145 psi).
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.