The AirTAC GR400-10 AirTAC Air Pressure Regulator Low-Pressure PT3/8 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 low-pressure air pressure regulator in the GR400 size, with a PT3/8 (3/8 in) port. This configuration is set up for applications that must run below the standard adjustment band: the low-pressure type regulates up to 0.4 MPa. Maximum inlet (working) pressure is 1.0 MPa (145 psi), and the unit operates in ambient and media temperatures from -20 to 70 C - a wider range than the rest of the G-series treatment family. An embedded square gauge with a psi scale is fitted as standard so the set pressure can be read directly at the unit, and a reverse (check) valve is fitted (code K) so downstream pressure is held if the upstream supply is lost. A mounting bracket is included, and the GR body is also panel-mountable.
This is a genuine AirTAC part. The GR regulator 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 your choice of gauge scale (MPa, psi or bar), an optional external round gauge, a reverse-valve option, and PT, G (BSPP) or NPT threads. Because AirTAC publishes regulator flow as curves rather than a single rated figure, we confirm the flow and datasheet figures for your application on request - just ask before ordering.
| Model | GR400-10 AirTAC Air Pressure Regulator Low-Pressure PT3/8 |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT3/8" (PT 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, psi 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | PT 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 |
Packaging machines that close, hold or nest product with air cylinders often need a setpoint well below the main header pressure. This low-pressure GR400-10 regulates that branch up to 0.4 MPa, with the psi gauge letting operators read and set the clamp pressure at the machine, and the check valve holding the setting if the supply drops.
Web converting and printing lines run air knives, drying nozzles and blow-off tips at reduced pressure to avoid marking the product. Dropping a 3/8 in branch off the header through this regulator gives the operator a dedicated low-pressure setting, read on the psi gauge, independent of the main line regulator.
Food, textile and chemical process areas frequently run actuators, dampers and gates from a reduced-pressure branch rather than the full plant header. This GR400-10 sets that branch up to 0.4 MPa, tolerates -20 to 70 C ambient conditions, and panel-mounts or brackets onto the zone's control panel for a tidy installation.
Start with the port step: the GR400 size carries a 3/8 in port, and the GR range steps 200/300/400/600 with ports from 1/8 in up to 1 in - pick the size whose curve covers the air your circuit consumes. Then choose the regulator type: this unit is the low-pressure (L) type, regulating up to 0.4 MPa; if your setpoint sits higher, the standard GR type adjusts from 0.05 to 0.9 MPa instead. Gauge options are the embedded square gauge (this unit has the psi scale; MPa and bar scales are available) or an optional external round gauge. The trailing K in the code means a reverse (check) valve is fitted; leave it off if you do not need downstream pressure held. Thread is PT as standard - G (BSPP) and NPT are catalogue options to order - and a mounting bracket is included, with panel mounting also possible on GR. One honest note on sizing: AirTAC publishes regulator flow as curves, not a single rated number, so ask us to confirm the flow for your application 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 regulator flow as curves, not as a single rated figure, so we do not quote a flow number for this unit. Send us your application details - supply pressure, set pressure and the air your circuit consumes - and we will confirm the flow against the GR400 datasheet curves on request before you order.
L is the low-pressure regulator type: this unit regulates up to 0.4 MPa, whereas a standard GR adjusts from 0.05 to 0.9 MPa - so choose L only if your setpoint sits in the low band. K means a reverse (check) valve is fitted, which holds downstream pressure if the upstream supply is interrupted. The F2 in the code is the embedded square gauge with a psi scale, and the PT3/8 port is PT thread as standard, with G (BSPP) and NPT available as order options.
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.