Dual stage filter element bypass valve
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United States of America Patent
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-
Nov 16, 2004
Grant Date -
Feb 26, 2004
app pub date -
Aug 23, 2002
filing date -
Aug 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A replaceable cartridge type dual stage bypass valve is used in dual filter multi-media filtration assemblies. The cartridge may be selected and easily replaced to meet the various combinations and requirements of the dual filter elements (primary and secondary). The individual bypass valves that form the dual stage bypass valve may each be responsive to a predetermined increase of pressure due to a clogged filter condition. The individual bypass valves may use replaceable coil springs. The spring force of the coil spring is determined by the pressure differential to be resisted, i.e., the resistance to be offered by the spring action of the spring, and the flow capacity at a given pressure differential.
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