Danfoss PAHT - Introduction

20 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12
Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps
1. Introduction ...........................................................................20
2. Benets................................................................................21
3. Application examples ..................................................................21
4. Technical data .........................................................................22
4.1 PAHT 2-12.5 ............................................................................22
4.2 PAHT 20-32 and PAHT 20-32 LP .........................................................23
4.3 PAHT 50-90 ............................................................................24
4.4 PAHT 256-308..........................................................................25
5. Flow ...................................................................................26
5.1 PAHT 2-6.3 typical ow curves at max pressure .........................................26
5.2 PAHT 10-12.5 typical ow curves at max pressure .......................................27
5.3 PAHT 20-32 typical ow curves at max pressure .........................................28
5.4 PAHT 20-32 LP typical ow curves at max pressure ......................................29
5.5 PAHT 50-90 typical ow curves at max pressure.........................................30
5.6 PAHT 256-308 typical ow curves at max pressure ......................................31
6. Motor requirements....................................................................32
7. Installation.............................................................................33
7.1 Filtration ..............................................................................33
7.2 Noise ..................................................................................33
7.3 Open-system design ...................................................................34
7.4 Closed-system design .................................................................35
8. Dimensions and connections...........................................................36
8.1 PAHT 2-6.3 .............................................................................36
8.2 PAHT 10-12.5...........................................................................37
8.3 PAHT 20-32 ............................................................................38
8.4 PAHT 50-90 ............................................................................39
8.5 PAHT 256-308..........................................................................40
9. Service.................................................................................41
1. Introduction
Table of Contents
The Danfoss range of PAHT high-pressure pumps
is specically designed for use with technical
water such as:
• Ultra-pure water that has undergone
multiple reverse osmosis processes
• De-ionized water
• Demineralized water
Danfoss PAHT pumps are positive displacement
pumps, with axial pistons that move a xed
amount of water in each cycle. Flow is propor-
tional to the number of input shaft revolutions
(rpm). Unlike centrifugal pumps, they produce
the same ow at a given speed independently of
no matter what the discharge pressure.