US PATENT SUBCLASS 137 / 505.18
.~.~.~ Balanced valve

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}
494  DF  .~ With separate connected fluid reactor surface {8}
505  DF  .~.~ With opening bias (e.g., pressure regulator) {13}
505.18.~.~.~ Balanced valve

DEFINITION

Classification: 137/505.18

(under subclass 505) Devices in which the valve is so related to the fluid controlled that the pressure bias imparted by the line pressure is balanced by means connected to but not forming a portion of the valve itself, so that the effect of line pressure tending to open or close the valve is cancelled out at least in part.