Signal device for detecting filter condition

Details Signal device for detecting filter condition Signal device for detecting filter condition

1974-02-25

1976-03-02

Swisher, S. Clement

Signals and indicators

Alarms

Fluid-pressure variation

116112, 116117R, G01L 912

Patent

active

039410773

ABSTRACT:
Disclosed herein is a signal device for detecting the condition of a fluid line filter and automatically activating a signal indicating that the filter requires cleaning or replacement. The signal device may be built in or installed as an attachment in the fluid lines leading to and from a filter for removing moisture and/or contaminants from the line. The signal device comprises a piston housing containing a piston movable to signalling position in response to reduced fluid pressure adjacent one end of the piston resulting from reduced volume of fluid passing through the filter, locking means for retaining the piston in said signalling position, and signal actuating means activated by fluid pressure when the piston is in said signalling position. The signal may be visual or audible, actuated mechanically or electrically.

REFERENCES:
patent: 2758563 (1956-08-01), Bigelow
patent: 3028009 (1962-04-01), Scavuzzo
patent: 3442134 (1969-05-01), Bennett
patent: 3594745 (1971-07-01), Nickels

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