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Class Information
Number: 137/485
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled
Description: Apparatus within ... in which the means sensing a change in fluid condition within the apparatus controls the application of another source of power for operating the flow control valve rather than acting directly through a mechanical connection.










Sub-classes under this class:

Class Number Class Name Patents
137/487.5 Electrically actuated valve 859
137/488 Fluid pressure type 200
137/486 Responsive to change in rate of fluid flow 401


Patents under this class:

Patent Number Title Of Patent Date Issued
8684028 Fuel quality traceable and remote system Apr. 1, 2014
8671972 Safety valve system for overpressure protection of hydraulic circuits Mar. 18, 2014
8627858 Methods and systems for selectively fuelling a vehicle Jan. 14, 2014
8555912 Dynamic leak control for system with working fluid Oct. 15, 2013
8550109 Gas meter device and gas supply system using the device Oct. 8, 2013
8430120 Liquid flow controller and precision dispense apparatus and system Apr. 30, 2013
8365762 Hydraulic control system Feb. 5, 2013
8251091 Temperature insensitive mass flow controller Aug. 28, 2012
8225813 Arrangement for controlling flow of fluid to a gas turbine engine component Jul. 24, 2012
8225814 Differential-pressure flowmeter and flow-rate controller Jul. 24, 2012
8091580 Pilot switch Jan. 10, 2012
8011382 Bi-modal bleed valve assembly for gas turbine engine Sep. 6, 2011
7917249 Intelligent sprinkler irrigation system Mar. 29, 2011
7784488 Valve for allocating available fluid to high priority functions of a hydraulic system Aug. 31, 2010
7766030 High pressure transducer Aug. 3, 2010
7590471 Intelligent sprinkler irrigation system Sep. 15, 2009
7284563 Surge relief apparatus and method Oct. 23, 2007
6820855 Air flow control valve Nov. 23, 2004
6516824 Apparatus and method for metering delivery quantity of ultra-low temperature liquefied gas Feb. 11, 2003
6371347 Air switch and palm guide for papermaking machinery Apr. 16, 2002
5937894 System and method for transporting a fluid susceptible to hydrate formation Aug. 17, 1999
5368067 Gas storage and recovery system Nov. 29, 1994
5070900 Safety valve actuator assembly Dec. 10, 1991
4261387 Pipeline surge relief system Apr. 14, 1981
3972364 Pressure surge relief system Aug. 3, 1976











 
 
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