The AirTAC GR400-15 AirTAC Air Pressure Regulator 1/2 in PT 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 PT1/2" 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 GR400-15 is a genuine AirTAC GR-series air pressure regulator: it does one job only, holding a stable downstream pressure from your compressed-air supply. This is the 400 size with a 1/2 in PT port, built as the low-pressure type with an adjustment range up to 0.4 MPa, so it suits circuits that must never see standard regulator settings. It comes fitted with an external round gauge scaled in psi and a reverse/check valve (code K) that holds downstream pressure when the upstream supply is lost, and it ships without a mounting bracket (code J) - the GR body is also panel-mountable.
GR regulators are genuine AirTAC parts, available across the 200, 300, 400 and 600 sizes with ports from 1/8 in to 1 in, PT as the standard thread and G (BSPP) or NPT as orderable options. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -20 to 70 C, wider than the rest of the G family. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GR400-15 AirTAC Air Pressure Regulator 1/2 in PT |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT1/2" (PT 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, 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| (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. |
| (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 · PT1/2" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
On a spray-finishing line where atomising air must stay well below standard regulator settings, the low-pressure GR400-15 with its 0.4 MPa ceiling and psi gauge gives operators a direct, safe setpoint at the booth.
On carton-sealing and case-packing machines, the fitted reverse/check valve keeps clamping and hold-down pressure stable in the circuit even if the main air supply drops, while the 1/2 in port feeds the machine's air manifold.
For laboratory rigs and pneumatic test benches that need gentle, closely limited supply pressure, the low-pressure regulator with a round psi gauge gives technicians a clear, protected setpoint at the bench drop.
Start with the port step: this 400 size carries a 1/2 in PT port, and the larger the size the more flow the body passes - match the size to your line rather than throttling a small regulator. This unit is the L low-pressure type, so choose it only where your setpoint sits within its up-to-0.4 MPa range; for higher setpoints, pick a standard GR. The fitted round gauge reads in psi; square embedded gauges and MPa or bar scales are the other catalogue choices. Thread is PT as standard, with G (BSPP) and NPT available to order. The J code means no mounting bracket is supplied - add one if you want the unit bolted to a plate or machine frame, remembering GR is also panel-mountable. The K reverse/check valve is already fitted here, which is the right choice where downstream pressure must be held on supply loss. Because 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 regulator flow as curves, not as a single rated number, so we do not quote a figure here. Tell us your line pressure, setpoint and expected air demand, and we will confirm the flow behaviour from the GR400 datasheet on request before you order.
The L in GR40015LJC2K marks the low-pressure type, whose adjustment range goes up to 0.4 MPa instead of the standard GR range - the right choice where downstream equipment must not see higher settings. The K means a reverse/check valve is fitted, holding downstream pressure if the upstream supply is interrupted.
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.