DIESEL FUEL AND UREA TANK AIR BREATHER FILTER

摘要

Provided is a filter that filters air flowing from the filter to a downstream component, while preventing fluid from flowing from the filter to the downstream component and preventing a substance, such as urea or fuel, entering the filter from the downstream component from degrading the filter element in the filter. The filter includes a filter element having an interior surface defining an inner chamber and a standpipe extending through the inner chamber and terminating at a point that allows air that flows from outside the filter element through the filter element and into the inner chamber to flow into the standpipe and out of the filter, while preventing fluid flowing from the opposite direction through the standpipe from entering the filter element.

主权项

1. A filter including:
a housing circumscribing a central axis, the housing having an inlet at a lower end and an outlet at an upper end; a filter element disposed within an upper portion of the housing, the filter element having an interior surface defining an inner upper chamber and an exterior surface defining with an interior surface of the housing an outer upper chamber; a standpipe forming a passageway communicating at an upper end to the outlet and at a lower end to a lower chamber in the housing below the inner upper chamber, the lower end of the standpipe extending through the inner upper chamber to a point no higher than a lower exposed surface of the filter element; and a check valve that permits flow from the lower chamber to the inlet and blocks flow from the inlet to the lower chamber.