The AirTAC GR400-15 AirTAC Low-Pressure Air Regulator NPT1/2 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 an AirTAC GR-series air pressure regulator in the 400 size with a 1/2 in NPT port. This is the low-pressure (L) type, so its set range tops out at 0.4 MPa - the right choice when the downstream circuit must never see standard-line pressure. The configuration carries an embedded square gauge reading in psi, a reverse/check valve (K) that holds the downstream setting if upstream supply is lost, and no mounting bracket (J); the GR body is also panel-mountable. As a pure regulator it contains no filter and no bowl, so it does not remove water or particulate and adds no lubrication.
This is a genuine AirTAC part. The GR family spans the 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, gauge scales in MPa, psi or bar, standard or low-pressure regulation, and PT as the standard thread with G and NPT as order options. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GR400-15 AirTAC Low-Pressure Air Regulator NPT1/2 |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT1/2" (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 | 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. |
|---|---|
| 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). |
| F | Gauge shape: Square. 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 · 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 carton-sealing or case-packing machine, soft clamp and hold-down cylinders often need a gentle, capped pressure well below the main line. This low-pressure GR regulator with its psi gauge lets the setter dial and read the clamp circuit directly in the units the shop uses, while the check valve holds the setting through supply dips.
A drying or debris blow-off station on a conveyor line usually runs best at a modest, stable pressure rather than full line supply. Feeding the air knives through this 1/2 in NPT regulator caps the circuit at up to 0.4 MPa, protects the nozzles and the product, and keeps the setting visible on the square gauge.
Looms, winders and fabric-handling equipment commonly use air for thread tension rollers, guides and light actuation where high pressure would damage the material. This GR400 regulator gives that section its own reduced, low-pressure supply independent of the plant main, with the check valve preventing backflow surprises during shutdowns.
Start with the size and port: 400 is the second-largest GR frame and carries a 1/2 in port, so match it to the line size and the flow your circuit needs - and remember flow is published as curves, not a single rating, so ask us to confirm sizing against the application before ordering. Choose the low-pressure (L) type only where the working setpoint stays at or below 0.4 MPa; for higher setpoints use the standard GR type with its 0.05-0.9 MPa range. Pick the gauge scale you want to read - this unit is fitted with a square psi gauge. Thread: PT is the AirTAC standard; G (BSPP) and NPT are catalogue options ordered by suffix, so order the T version if your piping is NPT. Bracket is optional (this unit omits it), and GR can also be panel-mounted.
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 we do not quote a l/min, SCFM or Cv number here. Send us your line size, upstream pressure and required downstream flow, and we will confirm the sizing against the GR400 datasheet on request before you order.
The L in the code GR40015LJF2TK marks the low-pressure type, whose set range goes up to 0.4 MPa - intended for circuits that must stay gentle. If your application needs setpoints above that, order the standard GR400 type instead, which adjusts from 0.05 to 0.9 MPa. The rest of the configuration (port, gauge, thread) stays the same.
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.