Page 16 - Parker - The Handbook of Hydraulic Filtration
P. 16
Fluid Cleanliness Standards
Filtration Fact Component Cleanliness
Level Requirements
Most machine and hydraulic Many manufacturers of hydraulic and
load bearing equipment specify the
component
optimum cleanliness level required for
manufacturers specify a their components. Subjecting compo-
target ISO cleanliness nents to fluid with higher contamina-
tion levels may result in much shorter
level to equipment in
component life.
order to achieve optimal
performance standards. In the table below, a few components
and their recommended cleanliness
levels are shown. It is always best to
Filtration Fact consult with component manufacturers
and obtain their written fluid cleanli-
Color is not a good ness level recommendations. This
indicator of a fluid’s information is needed in order to
select the proper level of filtration.
cleanliness level.
It may also prove useful for any
subsequent warranty
claims, as it may draw
Fluid Cleanliness Required for
the line between nor-
Typical Hydraulic Components
mal use and excessive
or abusive operation. ISO
Components Code
Servo control valves 17/14/11
Proportional valves 18/15/12
Vane and piston 19/16/13
pumps/motors
Directional & pressure 19/16/13
control valves
Gear pumps/motors 20/17/14
Flow control valves, 21/18/15
cylinders
New unused fluid 21/18/15
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