.~ With control of flow by a condition or characteristic of a fluid {6}
12
.~.~ By fluid pressure
DEFINITION
Classification: 137/12
(under subclass 2) Processes in which the condition or characteristic which is determined is a fluid pressure and the determination is used to cause delivery of controlled quantity of a fluent material at a part of the system.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7, for processes of mixture control depending on pressure sensing.
455+, for line condition change responsive valves, and see the search notes to subclass 455.
