Technical References Table of Contents
Donaldson provides this technical reference as a short course in “Hydraulic Filtration” – for those who want to gain a better understanding of hydraulic filtration. In industrial and mobile applications at factories all over the world, we too often see hydraulic circuits that don’t include proper fluid filtration, or include it as an afterthought. Good filtration needs to be an integral part of the hydraulic circuit to ensure the long life and proper operation of the pumps, valves and motors. A € 100 l lter protects your € 100,000 equipment. This section is offered to aid in choosing the filter that will help you achieve the ideal cleanliness levels and longest life for your critical components.
Topics
Hydraulic Components Need Protection How Contamination Damages Precision Parts
14 14 14 14 15 16 17 17 18 19 19 20 22 23 23 24 25 26 28 30 31 32 32
Types of Contaminant
Typical Factors in Component Life Where Contamination Comes From
Fluid Conditioning
Proper Filter Application
Fluid Properties
Types of Hydraulic Fluid
How Filter Media Functions in a Filtration System
How Filter Media Collects Particles Basic Types of Hydraulic Filter Media
Symbols Used
Donaldson Filter Media Efficiency Ratings per ISO 16889 Test Standards
ß
Beta Ratio Centistokes
Hydraulic Filtration Pressure Drop
cSt
Four Major Factors Contribute to Pressure Drop
Viscosity/Temperature Chart Filter Design and Construction
DP
Pressure Drop or Differential Pressure International Standards Organization
ISO
Combining the ISO Rating and Filter Performance Ratings
m
Micron or micrometer
Filter Efficiency Standards
ppm SSU SUS
Parts per million
Donaldson Hydraulic Filter Media Beta Ratings
Cleanliness Level Correlation Table
Saybolt Seconds Universal
Compatibility of Donaldson Filter Media with Hydraulic Fluids
Threads
Material in this section is in the public domain, not confidential, and may be copied for educational purposes at any time. Information was collected from many sources, both public and private, including Donaldson Company, Inc. Engineering Departments, Eaton Corporation, the Lightning ® Reference Handbook from Berendsen Fluid Power, Hydraulics & Pneumatics Magazine, National Fluid Power Association (NFPA), and various industry authorities.
Hydraulic Filters & Accessories • 15
Powered by FlippingBook