04030523 is referenced by 29 patents and cites 7 patents.

A digital flow control system for testing ramjet engines that permits conl of fuel in steps, or percentages, of full flow rate. Four cavitating venturis connected to four valves control the flow rate through the valves such that the fuel flow rate is regulated in 10% increments of full flow rate depending upon the combination of valves which are open.

Title
Digital flow control system
Application Number
5/677944
Publication Number
4030523
Application Date
April 19, 1976
Publication Date
June 21, 1977
Inventor
James A Loundagin
China Lake
CA, US
Walter Gill
China Lake
CA, US
Robert E Cram
Ridgecrest
CA, US
Agent
W Thom Skeer
Roy Miller
R S Sciascia
Assignee
The United States of America represented by the Secretary of the Navy
DC, US
IPC
G05D 7/06
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