Filter assembly utilizing dual filter elements and a pressure responsive member to provide differential pressure actuated switchover
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United States of America Patent
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Jun 28, 2005
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N/A
app pub date -
Nov 15, 2002
filing date -
Nov 15, 2002
priority date (Note) -
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Abstract
Method and apparatus for filtering contaminants from a pressurized fluid. First and second filter elements are arranged within a housing to receive a flow of pressurized fluid. Respective first and second portions of the flow are directed through the filter elements and impinge opposing sides of a piston member which is biased in a first position by a collapsible pressure responsive member, such as a buckling pin. So long as the differential pressure across the first filter element is below a selected threshold, the first portion of the flow passes through an outlet of the housing and the second portion of the flow is blocked. Once sufficient contaminants have been captured by the first filter element, however, the resulting increase in differential pressure causes a collapse of the pressure responsive member. This moves the piston to a second position and directs the second portion of the flow to the outlet.
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