03942553 is referenced by 19 patents and cites 6 patents.

Individually actuatable digital valve elements in parallel interconnect a fluid source to a receiver. In the flow passage of each valve element, there is a converging-diverging nozzle that feeds into the receiver. A trim adjustment screw is movable along the axis of each nozzle to vary the effective cross-sectional area of such nozzle. The nozzle and screw are part of an insert that can be mounted in the valve body after individual calibration.

Title
Digital fluid flow control system with trim adjustment
Application Number
5/432152
Publication Number
3942553
Application Date
January 10, 1974
Publication Date
March 9, 1976
Inventor
Robert A Gallatin
Newport Beach
CA, US
Agent
Christie Parker & Hale
Assignee
Process Systems
UT, US
IPC
F16K 11/24
View Original Source