Figure 9-48.—Proportional-flow filter,pressure. The pressure difference forces some ofthe fluid through the element to rejoin the mainstream at the venturi. The amount of fluid filteredis proportional to the flow velocity. Hence, thename proportional-flow filter.Indicating FiltersIndicating filters are designed to signal theoperator when the element needs cleaning.There are various types of indicators, suchas color-coded, flag, pop-up, and swing arm.Figure 9-49 shows a color-coded indicatingfilter. The element is designed so it beginsto move as the pressure increases due to dirtaccumulation, One end is linked to an indicatorthat shows the operator just how clean ordirty the element is. Another feature of thistype of filter is the ease and speed withwhich the element can be removed and replaced.Most filters of this kind are designed forinlet line installation.Figure 9-49.—Color-coded indicating filter.9-31
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