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Class Information
Number: 251/281
Name: Valves and valve actuation > Balanced valves
Description: Subject matter wherein the valve is so related to the fluid controlled that the pressure bias imparted by the line pressure is balanced by opposing surfaces related to the valve, so that the effect of the line pressure tending to open or close the valve is cancelled out at least in part and a lesser external force is necessary to actuate the valve.

Sub-classes under this class:

Class Number Class Name Patents
251/282 Reciprocating 396
251/283 Rotary 79

Patents under this class:

Patent Number Title Of Patent Date Issued
8333362 Pressure compensating method Dec. 18, 2012
8113482 Microvalve device with improved fluid routing Feb. 14, 2012
7380768 Balanced-plug cage style control valve and bonnet seal assembly Jun. 3, 2008
7195229 Automatic sampler Mar. 27, 2007
7083160 Balanced-plug cage style control valve and bonnet seal assembly Aug. 1, 2006
6994115 Thermally actuated microvalve device Feb. 7, 2006
6989729 Proportional pressure control valve for controlling the pressure level in a hydraulic circuit Jan. 24, 2006
6932321 Balanced-plug cage style control valve and bonnet seal assembly Aug. 23, 2005
6902704 Injection pump assembly for a combinatorial reactor and related method Jun. 7, 2005
6641110 Binary balance seal assembly Nov. 4, 2003
6173785 Pressure-balanced rod piston control system for a subsurface safety valve Jan. 16, 2001
5540259 Automatically releasable shut-off coupling Jul. 30, 1996
5133386 Balanced, pressure-flow-compensated, single-stage servovalve Jul. 28, 1992
4930541 Variable orifice diverter valve Jun. 5, 1990
4697620 Sanitary valve assembly Oct. 6, 1987
4597556 Rotary valve operating mechanism Jul. 1, 1986
4385642 Bi-stable electrically operated valve May. 31, 1983
4148337 Free delivery return valve and associated system Apr. 10, 1979

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