AirTAC GR400-15 Pressure Regulator (GR40015LJN)
The AirTAC AirTAC GR400-15 Pressure Regulator (GR40015LJN) 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, ordered without a 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.
- TypePressure regulator
- Port sizePT1/2"
- Regulating range0.05 - 0.4 MPa (7 - 58 psi)
- Pressure typeLow-pressure type
- Pressure gaugeNot fitted
- Reflux valveNot fitted
- ThreadPT
- BracketSupplied without bracket
About the AirTAC GR400-15 Pressure Regulator (GR40015LJN)
The AirTAC GR40015LJN is a genuine AirTAC G-series air pressure regulator: it reduces and holds a stable downstream air pressure and does nothing else - no filtration, no bowl, no lubrication. This is the low-pressure (L) type, so the set point can be adjusted anywhere up to 0.4 MPa, which suits lines that run gently below normal plant pressure. The 400 size with PT1/2 port gives a half-inch PT (BS 21 taper) connection as the standard thread. This configuration has no mounting bracket (J) and no pressure gauge (N).
It is a genuine AirTAC part in the GR400 size range, which steps up through port sizes and flow capacity. Standard-type GR regulators, brackets, gauges and G/NPT thread options are all available if this exact build is not the one you need. AirTAC publishes regulator flow as curves rather than a single rated figure, so we will confirm the flow and datasheet figures against your application on request.
AirTAC GR400-15 Pressure Regulator (GR40015LJN) Technical Specifications
| Model | AirTAC GR400-15 Pressure Regulator (GR40015LJN) |
|---|---|
| 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 | Not fitted |
| Reflux valve | Not fitted |
| 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.
Model Code: AirTAC GR400-15 Pressure Regulator (GR40015LJN)
| 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | PT thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
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.
Size Class
- GR200PT1/8" - PT1/4"
- GR300PT1/4" - PT1/2"
- GR400PT3/8" - PT1/2"
- GR600PT3/4" - PT1"
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 |
Where the AirTAC GR400-15 Pressure Regulator (GR40015LJN) Is Used
Spray-booth atomizing air
On a paint-spray line, the atomizing air to the spray guns is held at a gentle set point. This low-pressure GR400 regulator on the 1/2-inch gun-air header keeps that pressure where the finish recipe calls for it, without overshooting into the low range the booth needs.
Glue and coating dispensing
A dispensing head on a packaging or electronics line needs a steady, modest air pressure to meter beads and dots consistently. This regulator sits in the supply line to the dispenser so the shot stays repeatable across the shift.
Pilot air to process valves
Pneumatically piloted process valves and dampers often take their pilot supply from a reduced-pressure branch. Mounted on the pilot-air takeoff at half inch, this unit holds the pilot pressure steady so the valve strokes with consistent force.
Is the AirTAC GR400-15 Pressure Regulator (GR40015LJN) the Right Regulator?
Choose the 400 size / PT1/2 port when your line is piped at half inch; smaller and larger GR400 port options exist to match your flow. This L-type unit regulates up to 0.4 MPa - if you need the full 0.05-0.9 MPa (7-130 psi) standard range, pick the non-L GR400 code instead. Bracket and gauge are deletions here, so order a bracketed or gauged variant if you want them; an embedded square gauge (MPa, psi or bar scale) or an external round gauge can be specified on other codes. Thread is PT as standard, with G (BSPP) and NPT available as order options.
Flow for GR regulators is published as curves, not a single rated number, so ask us to confirm sizing against your application before ordering.
Quick checklist
- ✓ Body size for your peak flow (PT1/2" here)
- ✓ Standard 0.9 MPa or low-pressure 0.4 MPa
- ✓ Gauge fitted, or order N without
- ✓ Gauge shape C round / F square
- ✓ Scale MPa (1), psi (2) or bar (3)
- ✓ Reflux valve needed, order K
Installation & Maintenance Notes
- check Install downstream of the filter, following the airflow arrow.
- check Keep inlet pressure at or below 1.0 MPa (145 psi).
- check Set pressure while air is flowing, then lock the knob.
- check Adjust within 0.05 - 0.4 MPa (7 - 58 psi) only.
- check Operating range -20 to +70 °C.
- check Panel-mount or use the fixing bracket; do not hang it on tubing.
Without a reflux valve, air cannot flow back through the regulator — order the K option if reverse flow is required. A regulator does not remove water or particulate; that is the filter's job.
AirTAC GR400-15 Pressure Regulator (GR40015LJN) FAQ
AirTAC publishes GR regulator flow as curves rather than a single rated figure, so there is no one flow number we can quote honestly. Send us your line pressure, set pressure and expected air demand, and we will confirm the sizing from the datasheet curves before you order.
The L in the code marks the low-pressure type: the set point is adjustable up to 0.4 MPa instead of the standard GR range of 0.05-0.9 MPa (7-130 psi). Choose this code when your process runs below 0.4 MPa; the standard-type GR400 codes cover the full range. This particular build also deletes the bracket (J) and the gauge (N).
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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.