G - Physics – 01 – L
Patent
G - Physics
01
L
116/67.5
G01L 1/08 (2006.01) G01L 7/16 (2006.01) G01M 13/00 (2006.01)
Patent
CA 1056652
f FILTER CONDITION INDICATOR Abstract of the Disclosure A pressure differential indicator for indicating a change in a fluid pressure differential across a component in a fluid system, such as an oil filter, has piston means, means for communicating fluid pressures of said system upstream and downstream of said component to opposite sides of said piston means, respectively, and differential means associated with the piston means for normally balancing the resultant forces of said pressure on opposite sides of said piston means at a given pre- determined pressure differential across said component whereby said piston means is responsive to a change in the pressure differential above or below said predetermined differential pressure to indicate either a clean or a clogged filter condition. Means are provided for holding the piston means in its last position upon relief of said first and second pressures to indicate the operating filter condition when the system is not operating. In alternative embodiments, the indicator includes "kicker" means to start its motion, is responsive at all times to pressure differential above or below a predetermined value and includes a number of embodiments of adaptors to accommodate its introduction into fluid systems.
222911
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