Air preparation assemblies filter incoming compressed air, regulate downstream pressure and, where required, add lubricant. The 398 combination provides all three functions. Individual QSL, QTY and QIU units support a modular layout selected around the requirements of downstream valves and actuators.
Models and selection data
| Model or series | Published configuration or function | Selection details |
|---|---|---|
| 398 | Three-piece air preparation unit | Maximum working pressure 1.0 MPa. Working temperature 0–50 °C. Catalog water separation efficiency at least 80%. |
| 399 | Two-piece air preparation unit | Maximum working pressure 1.0 MPa. Working temperature 0–50 °C. Confirm the required filter grade. |
| 397 | Filter-regulator | Confirm the outlet range, filter grade and flow at the intended pressure drop. |
| 394 / 395 / 396 | Water-separating filter, regulator and lubricator respectively | Specify each function and its required port size. |
| QSL-8 / QSL-10 / QSL-15 / QSL-20 / QSL-25 / QSL-40 | QSL air filters | Choose filtration and drain details for the selected size. |
| QTY / QIU | Regulator and lubricator respectively | Confirm pressure range, rated flow and bowl configuration. |
Published operating data
| 398 nominal port | Nominal bore (mm) |
|---|---|
| G1/8 | 6 |
| G1/4 | 8 |
| G3/8 | 10 |
| G1/2 | 15 |
| G3/4 | 20 |
| G1 | 25 |
Reading a flow rating
A port connection and a nominal bore describe different features. Compare the flow with the intended upstream pressure, regulated outlet pressure and allowable pressure drop. The 398 catalog presents flow data at a stated pressure drop of 0.1 MPa.
Choosing a preparation train
Check the downstream equipment requirements before specifying a lubricator. Include drain access, bowl clearance, gauge orientation and adjustment access in the machine layout. For a two-piece assembly, verify the functions included in the complete order code.