US PATENT SUBCLASS 137 / 462
.~.~ Reset by pressure equalization valve or by-pass

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
456  DF  .~ Safety cut-off requiring reset {7}
462.~.~ Reset by pressure equalization valve or by-pass

DEFINITION

Classification: 137/462

(under subclass 456) Apparatus in which the valve is reopened or reset by use of by-passes and/or valves which equalize the pressure on both sides of the main or cut-off valve, thereby permitting or causing the cut-off valve to open by fluid pressure alone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

599+, for distribution systems comprising by-passes, and see the search notes to subclass 599.

629+, for plural valve organizations of the pressure equalization type.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation, 281+, for balanced valves of general utility, and see the search notes thereto.