Page 9 - ingenioren

Liquid Filter Design Features
Heavy-duty Design

Filter Media OVERVIEW
Curing is the process that adds strength
to the filter media and ensures that filter
bypass does not occur. Donaldson cures
filter media while the media is in a flat,
pleated state to ensure consistent and
even curing. Competitive brands cure
the media after the filter is assembled –
leaving the media poorly cured and in a
weakened condition. Uncured media has
very low strength and can rupture easily
when saturated with oil. Donaldson cures its filter media (on left) before the filter is assembled, as shown by the
consistent color of the entire surface of the filter media. The uneven color variation of the
filter media of competitive brands (on right) is an indication that the filter media was cured
after filter assembly.

Inner Liner
Donaldson’s spiral wound construction
allows more flow area without
compromising the collapse strength.
Sharp edges on holes in competitive
tubes can cause media tears during pleat Donaldson unique center flow tube allows greater flow
movement. without compromising strength.

Donaldson’s louver design has hundreds
more flow openings. The louvers are
pushed in towards the inner tube, the
surface is smooth and pleat tip wear is
eliminated.

Liners with open holes can cause media tears during
pleat movement.

Housing Material & Shape Inner Spring or Grommet
Donaldson domes and corner radius have superior pressure fatigue These components
performance. Filters with wrench flats or sharp radius edges will crack keeps the internal filter
sooner than a Donaldson filter. compressed against the
baffle plate and seal.
Donaldson spin-on filters
use coil springs and
grommets which compress and rebound
under extreme pressure. Competitive
Brand A Brand B
Donaldson brands use a leaf spring which, when
compressed, will bend and deform,
allowing unfiltered fluid to bypass the
filter.

www.donaldson.com Engine Liquid Filtration • 7