The AirTAC GR400-10TK AirTAC Air Regulator NPT 3/8 in, Check Valve is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.9 MPa (7 - 130 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 GR400-10TK is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream pressure from a compressed-air supply. This size 400 unit carries a 3/8 in NPT port and is the standard (not low-pressure) type, adjustable from 0.05 to 0.9 MPa (7-130 psi) with a maximum inlet pressure of 1.0 MPa (145 psi). The code confirms an external round gauge with a psi scale fitted, a reverse/check valve (K) that helps hold the set pressure against downstream backflow, and no mounting bracket - the unit is panel-mountable. Because it is a pure regulator, it contains no filter, no bowl and no drain; it operates in compressed air from -20 to 70 C, a wider temperature window than the rest of the G family.
This is a genuine AirTAC part. The GR line spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in PT (standard), G (BSPP) or NPT thread, with or without gauge, bracket or reverse/check valve, and a low-pressure (L) variant limited to 0.4 MPa. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures on request.
| Model | GR400-10TK AirTAC Air Regulator NPT 3/8 in, Check Valve |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT3/8" (NPT thread) |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard 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, 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". |
| (blank) | Standard type — 0.05 - 0.9 MPa (7 - 130 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. |
| 2 | Gauge scale: psi. 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 - 0.9 MPa (7 - 130 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
Set a stable, reduced pressure feeding gripper and end-of-arm tooling circuits on an assembly robot, so clamping force stays consistent cycle after cycle. The check valve helps the set point survive momentary downstream backflow.
Regulate the branch feeding carton-sealing cylinders and diverters on a packaging conveyor, holding a fixed working pressure independent of what the compressor room delivers. The round psi gauge gives operators a direct local readout.
Trim the pressure to a bench pneumatic clamp or light press so workpieces are held without over-driving the tooling, with the regulator panel-mounted at the station and the psi scale matching the shop's gauges.
Start with the port step: size 400 with a 3/8 in NPT port suits circuits where you want a mid-to-large regulator body on 3/8 in piping; step up to size 600 or down to 300/200 if your line runs larger or smaller. Set the downstream pressure anywhere in the 0.05-0.9 MPa (7-130 psi) range; if your process must run at or below 0.4 MPa, the low-pressure L type is the matching variant. This unit ships configured with a round psi gauge - if your panel reads MPa or bar, the same regulator can be ordered with those gauge scales instead. The fitted reverse/check valve (K) is worth keeping if backflow could disturb your set point; it can be omitted on order. Thread is NPT here, but PT (standard) and G (BSPP) versions exist, and the J code means no bracket is included, so plan for panel mounting. Flow is published as curves, not a single rating, so 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 number, so there is no one flow figure we can quote. Tell us your inlet pressure, set pressure and the flow your circuit needs, and we will confirm the correct size from the datasheet on request before you order.
T is the NPT thread option (PT is the standard thread, and G/BSPP is also available to order), and K means a reverse/check valve is fitted to help hold the set pressure against backflow. The gauge here is the external round type with a psi scale; MPa or bar scales can be ordered instead.
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.