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Class Information
Number: 137/87.01
Name: Fluid handling > Self-proportioning or correlating systems
Description: Subject matter wherein a fluid flow in a first flow line is proportioned or correlated with the fluid flow in a second fluid flow line by a movable means, which is positioned in one of the fluid flow lines and controlling the fluid flow in the other fluid flow line in response to a sensor detecting a variable condition or characteristic of the fluid in the other fluid flow line.

Sub-classes under this class:

Class Number Class Name Patents
137/87.03 Flow rate responsive 38
137/94 Fuel controlled by boiler or water system condition 12
137/87.02 Liquid level responsive 12
137/88 Mixture condition maintaining or sensing 161
137/87.05 Plural sensors 12
137/109 Self-controlled branched flow systems 33
137/98 Self-proportioning flow systems 129
137/102 Supply and exhaust type 293

Patents under this class:

Patent Number Title Of Patent Date Issued
8591221 Combustion blower control for modulating furnace Nov. 26, 2013
8443825 Faucet valve system May. 21, 2013
8375970 Valve system Feb. 19, 2013
8066026 Diaphragm controlled bypass valve Nov. 29, 2011
8056643 Systems and techniques to actuate isolation valves Nov. 15, 2011
8020573 Microfluidic channels and reservoirs in portable electronic devices Sep. 20, 2011
7945989 Wet extractor valve system May. 24, 2011
7776275 Chemical feeder system and method Aug. 17, 2010
7757662 Fuel injection metering valves Jul. 20, 2010
7670480 Solvent supply with correction of piston movement Mar. 2, 2010
7636640 Multi-gas flow device Dec. 22, 2009
7531138 Device and method for rapidly lysing cells or viruses May. 12, 2009
7416903 Wavy interface mixer Aug. 26, 2008
7318912 Microfluidic systems and methods for combining discrete fluid volumes Jan. 15, 2008
7195229 Automatic sampler Mar. 27, 2007
7192559 Methods and devices for high throughput fluid delivery Mar. 20, 2007
7165569 Safety shut-off device Jan. 23, 2007
7118910 Microfluidic device and methods of using same Oct. 10, 2006
6955188 Switch valve for the exhaust gases of an internal combustion engine Oct. 18, 2005
6571817 Pressure proving gas valve Jun. 3, 2003
6520076 Oil pressure device Feb. 18, 2003
6220270 Brake velocity fuse Apr. 24, 2001
6109288 Flow control apparatus Aug. 29, 2000
6070607 Differential pressure supply system Jun. 6, 2000
5960814 Counter balanced locking valve Oct. 5, 1999
5960809 Fuel equalizing system for plurality of fuel tanks Oct. 5, 1999
5918621 Automatic, pressure-sensitive, independent zone, diverter check valve Jul. 6, 1999
5449051 Pneumatic oil lubricator Sep. 12, 1995
5236001 Dual fluid remote control valve Aug. 17, 1993
4679778 Fluid-containing power unit mounting device Jul. 14, 1987
4664084 Fuel metering system May. 12, 1987
4513358 Lamp comprising automatically actuated louver system Apr. 23, 1985
4446890 Continuity actuated isolation valve assembly May. 8, 1984
4227746 Braking pressure control unit for a dual circuit brake system Oct. 14, 1980
4067348 Fuel shut-off valve Jan. 10, 1978
4044788 Diaphragm actuated valves Aug. 30, 1977
4039009 Hydraulic control system for a tree felling unit Aug. 2, 1977
4019525 Tractor protection valve Apr. 26, 1977
3957073 Pressure balancing valve May. 18, 1976

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