The Danfoss PAH 2 (code 180B6124) is an axial piston high-pressure pump for tap water and other low-lubricity fluids. It is oil-free and water-lubricated — the pumped water itself lubricates the bearings, so there is no oil circuit and no path for oil to contaminate the process. The housing is AISI 304 stainless steel.
Documentation & Drawings
Technical Specifications
| Identification | |
| Code number | 180B6124 |
| Pump size | PAH 2 |
| Series | PAH 2 – 12.5 |
| Type | Axial piston, oil-free, water-lubricated |
| Version | ATEX / EX approved |
| Housing material | AISI 304 stainless steel |
| Standard-rotation code | 180B0024 |
| Displacement & Flow | |
| Geometric displacement | 2 cm³/rev (0.12 in³/rev) |
| Flow at 1000 rpm, max. pressure | 1.0 l/min |
| Flow at 1500 rpm, max. pressure | 2.0 l/min |
| Flow at 1200 rpm, max. pressure | 0.4 gpm |
| Flow at 1800 rpm, max. pressure | 0.7 gpm |
| Pressure | |
| Max. outlet pressure | 140 barg (2030 psig) |
| Min. outlet pressure | 10 barg (145 psig) |
| Inlet pressure, continuous | 0-4 barg (0-58 psig) |
| Speed | |
| Min. speed, continuous | 700 rpm |
| Max. speed | 1800 rpm |
| Operating Conditions | |
| Media temperature | 2-50 °C (36-122 °F) |
| Ambient temperature | 0-50 °C (32-122 °F) |
| Sound pressure level LPA at 1 m | 76 dB(A) |
| Mechanical | |
| Weight (dry) | 4.4 kg (9.7 lb) |
| Torque at max. specification | 5.9 Nm (4.4 lbf-ft) |
| Typical Motor | |
| Motor size at 1500 rpm, max. pressure | 0.9 kW |
| Motor size at 1800 rpm, max. pressure | 1.5 HP |
| Identification | |
| Manufacturer | Danfoss High Pressure Pumps |
| Data sheet reference | Danfoss AI073186502976en-001902, §4.1 |
Video
How an axial piston pump works — the same working principle as the PAH range
Video courtesy of Danfoss High Pressure Pumps.
Why an Axial Piston Pump for Tap Water
Flow from a positive-displacement axial piston pump is set by displacement and shaft speed rather than by system pressure, so output holds steady as back-pressure rises — unlike a centrifugal pump, whose output falls away as head increases.
- Oil-free — lubricated by the pumped water, so no oil changes and no contamination path into the process.
- No high-pressure mechanical seal — a common wear point on other pump types is simply absent.
- AISI 304 housing, suited to tap water and other clean low-lubricity fluids.
- Field serviceable — Danfoss supplies purpose-designed service kits and tools, which we stock.
Typical duties include high-pressure water mist and fog systems, humidification, dust suppression, industrial cleaning, hydrostatic testing and water hydraulics.
Frequently Asked Questions
What flow will the PAH 2 give me?
Does it come with a motor?
Can it run on water other than tap water?
What inlet pressure does it need?
How is it serviced?
Specifications reproduced from Danfoss data sheet AI073186502976en-001902 (2023.03), §4.1. PAH® is a registered trademark of Danfoss A/S. Danfoss reserves the right to alter specifications without notice; confirm critical values against the current data sheet before purchase.
