04769135 is referenced by 32 patents and cites 8 patents.

A fluid metering device (10) is provided for automatically restricting (i.e., shutting off or reducing) fluid flow to a filter (16). The metering device (10) has a vane (32) which turns as fluid flows and thereby drives a gear (92). Once the vane (32) has rotated a selected number of times, as a result of the fluid flow, the rotation of the gear will break a frangible link (82), causing the fluid flow to stop or reduce by closing a valve (60). The customer will know to replace the filter (16) when the fluid no longer flows or is substantially reduced, and the customer will also have to replace the frangible link (82) to enable the fluid to flow at full volume again.

Title
Automatic metering system
Application Number
7/20348
Publication Number
4769135
Application Date
March 2, 1987
Publication Date
September 6, 1988
Inventor
William W Norton
Lincolnshire
IL, US
Agent
George H Gerstman
Assignee
Culligan International Company
IL, US
IPC
G01F 1/06
G01F 15/12
B01D 35/00
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