Filter restriction indicator

Details Filter restriction indicator Filter restriction indicator

1979-05-22

1981-03-10

Yasich, Daniel M.

Signals and indicators

Indicators

Fluid flow

55274, 55DIG34, 73709, 116270, 116DIG25, G01L 708, G01L 1908

Patent

active

042547318

ABSTRACT:
An indicator device for indicating when a prechosen pressure difference has been exceeded comprises a casing having two ports separated by a resilient diaphragm with an aperture therein, and a movable member urged into sealing relation with said aperture so as to prevent leakage therethrough, the configuration of the member and the aperture being selected so that, in use, the application of a prechosen pressure differential between said ports will cause the member to partly pass through the aperture to a position whereat it is retained by the diaphragm, said member being provided with means for indicating that it has been so retained.

REFERENCES:
patent: 3443365 (1969-05-01), Lee et al.
patent: 3465707 (1969-09-01), Kashiwaba
patent: 3779080 (1973-12-01), Smith
patent: 3963891 (1976-06-01), Magondeaux

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