Dial-type flow-restriction gauges

Details Dial-type flow-restriction gauges Dial-type flow-restriction gauges

2011-04-12

2011-04-12

Allen, Andre J (Department: 2855)

Measuring and testing

Fluid pressure gauge

Reexamination Certificate

active

07921720

ABSTRACT:
Dial-type flow-restriction gauges are used for indicating flow-restriction conditions of fluid filters, such as automobile air and fuel filters. Prior versions of these type filters have been more complicated and costly to manufacture than desirable. Accordingly, the present inventors have devised, among other things, an exemplary dial-type flow-restriction gauge that is inexpensive to manufacture and performs reliability and consistently over a wide temperature range. One exemplary gauge includes an external dial that rotates relative a restriction scale in response to a differential pressure. Placement of the dial on the exterior of the gauge eliminates the need to use clear material and allows embedding of the restriction scale into an exterior surface of the gauge.

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