US PATENT SUBCLASS 137 / 630.21
.~.~.~ Rotary concentric valves

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


137 /   HD   FLUID HANDLING

561 R  DF  SYSTEMS {32}
628  DF  .~ Sequentially progressive opening or closing of plural valves {4}
630.19  DF  .~.~ Lost motion {3}
630.21.~.~.~ Rotary concentric valves

DEFINITION

Classification: 137/630.21

(under subclass 630.19) Systems in which the valves rotate about a common axis, one valve having relative motion with respect to and within the other, and having a lost motion connection between one of the valves and the actuator, or the other valve.