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Class Information
Number: 137/487
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled > Responsive to change in rate of fluid flow > Control by pressures across flow line valve
Description: Apparatus in which the flow pressure drop across the flow line valve is used to control the flow line valve pilot or servo system.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8701703 Method and apparatus for controlling gas flow via a gas shut-off valve assembly Apr. 22, 2014
8590561 Pressure sensor, differential pressure type flow meter, and flow rate controller Nov. 26, 2013
8578962 Connection fitting Nov. 12, 2013
8555914 Method for autonomous control of a chemical injection systems for oil and gas wells Oct. 15, 2013
8499786 Mass flow controller with enhanced operating range Aug. 6, 2013
8483998 In situ emission measurement for process control equipment Jul. 9, 2013
8453688 Kit and device for connecting and transferring fluid and the use of said device Jun. 4, 2013
8381755 Pressure type flow rate control reference and corrosion resistant pressure type flow rate controller used for the same Feb. 26, 2013
8373539 Gas cutoff apparatus Feb. 12, 2013
8365761 Regulator unit and method for regulating a flap opening of a flap situated in a mass flow line Feb. 5, 2013
8322362 Backup pneumatic water pressure device Dec. 4, 2012
8286662 Switching valve with slider Oct. 16, 2012
8286661 Bi-directional overpressure shut-off valve Oct. 16, 2012
8150553 Apparatus and method for pressure fluctuation insensitive mass flow control Apr. 3, 2012
8109289 System and method for decentralized balancing of hydronic networks Feb. 7, 2012
7972561 Microfluidic device Jul. 5, 2011
7809473 Apparatus and method for pressure fluctuation insensitive mass flow control Oct. 5, 2010
7753066 Single system for low or high pressure gases control and high or low pressure gases control valve Jul. 13, 2010
7543596 Liquid flow controller and precision dispense apparatus and system Jun. 9, 2009
7424346 Apparatus and method for pressure fluctuation insensitive mass flow control Sep. 9, 2008
7422028 Apparatus for controlling and metering fluid flow Sep. 9, 2008
7412336 Attitude insensitive flow device system and method Aug. 12, 2008
7131451 Apparatus for controlling and metering fluid flow Nov. 7, 2006
6944529 Automatic fluid draining from a hydraulic system component of an automatic transmission Sep. 13, 2005
6868861 Level control system for sheet casting process Mar. 22, 2005
6860284 Method and device for controlling at least one valve Mar. 1, 2005
6837260 Pressure support system having a two-piece assembly Jan. 4, 2005
6823887 Water heater shut off device with water pressure delay line Nov. 30, 2004
6662554 Adjustable restriction muffler system for a combine Dec. 16, 2003
6634426 Determination of plunger location and well performance parameters in a borehole plunger lift system Oct. 21, 2003
6578435 Chemically inert flow control with non-contaminating body Jun. 17, 2003
6527862 Flow controller Mar. 4, 2003
6460565 Fluid metering apparatus and method Oct. 8, 2002
6450200 Flow control of process gas in semiconductor manufacturing Sep. 17, 2002
6348098 Flow controller Feb. 19, 2002
6308753 System for loading and unloading fluid tanks containing hazardous fluids Oct. 30, 2001
6065492 Gas mass flow metering valve May. 23, 2000
6029527 Fluid flow rate measuring and controlling device and method Feb. 29, 2000
6021808 Fluid supply shut off valve system and fluid monitoring device for use with same Feb. 8, 2000
5797418 Differential pressure detector with reduced reaction forces Aug. 25, 1998
5520206 Exhaust reduction system for control valves May. 28, 1996
5520211 Pressure reduction and flow regulation device May. 28, 1996
5460196 Fluid supply pressure control method and apparatus Oct. 24, 1995
5388607 Control system for supplying a gas flow to a gas consumption Feb. 14, 1995
5331995 Flow control system for medical ventilator Jul. 26, 1994
5234021 Nozzle damper assembly Aug. 10, 1993
5190068 Control apparatus and method for controlling fluid flows and pressures Mar. 2, 1993
5143116 Flow regulating valve and system using the same Sep. 1, 1992
5129619 Sealed magnetically operated flow control valve assembly Jul. 14, 1992
5063962 Apparatus for the controlled ventilation of rooms Nov. 12, 1991

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