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Class Information
Number: 137/486
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled > Responsive to change in rate of fluid flow
Description: Apparatus in which the valve is operated in response to the sensing of the velocity of the fluid flow or to the pressure differential along the flow line under flow condition.

Sub-classes under this class:

Class Number Class Name Patents
137/487 Control by pressures across flow line valve 77

Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
8678025 Method and apparatus for controlling fluid pressure Mar. 25, 2014
8666556 Systems and methods for dynamic feedforward Mar. 4, 2014
8651135 Mass flow controller, mass flow controller system, substrate processing device, and gas flow rate adjusting method Feb. 18, 2014
8640729 Method and apparatus for automatic fluid shut-off Feb. 4, 2014
8640731 Flow rate control device Feb. 4, 2014
8636024 Fuel supply device Jan. 28, 2014
8622073 Apparatus and method for controlling flow rate of liquid, and storage medium Jan. 7, 2014
8573247 Flow-rate controller, and regulator unit and valve unit used for the same Nov. 5, 2013
8555914 Method for autonomous control of a chemical injection systems for oil and gas wells Oct. 15, 2013
8490645 Pressure sensor, pressure-differential flow rate meter, and flow rate controller Jul. 23, 2013
8479758 Methods and devices for reducing water consumption Jul. 9, 2013
8464741 Flow control method for multizone gas distribution Jun. 18, 2013
8439068 Fluid flow control valve May. 14, 2013
8418714 Flow rate range variable type flow rate control apparatus Apr. 16, 2013
8373539 Gas cutoff apparatus Feb. 12, 2013
8365762 Hydraulic control system Feb. 5, 2013
8356623 Mass flow meter and mass flow controller Jan. 22, 2013
8307845 Flow rate controller Nov. 13, 2012
8307627 Method and device for monitoring the formation of deposits of solid particles, particularly in a fuel line and in the fuel valves of a gas turbine Nov. 13, 2012
8286652 Configurable active jerk control Oct. 16, 2012
8240324 Method and apparatus for in situ testing of gas flow controllers Aug. 14, 2012
8230877 Mass flow rate control system Jul. 31, 2012
8219641 Automated data delivery systems Jul. 10, 2012
8205629 Real time lead-line characterization for MFC flow verification Jun. 26, 2012
8205635 Flowmeter and flow-rate controller Jun. 26, 2012
8196601 Thermal flow sensor with zero drift compensation Jun. 12, 2012
8176951 Versatile systems for continuous in-line blending of butane and petroleum May. 15, 2012
8160833 Thermal mass flow sensor with improved response across fluid types Apr. 17, 2012
RE43288 High purity fluid delivery system Apr. 3, 2012
8131400 Adaptive on-tool mass flow controller tuning Mar. 6, 2012
8109288 Flow rate control system and shower plate used for partial pressure control system Feb. 7, 2012
8087427 Vapor phase epitaxy apparatus and irregular gas mixture avoidance method for use therewith Jan. 3, 2012
8056579 Mass flow controller Nov. 15, 2011
8052845 Reflux divider for a column having portions for the transfer of material arranged in parallel Nov. 8, 2011
8019481 Flow rate ratio control device Sep. 13, 2011
7975718 In-situ monitor of injection valve Jul. 12, 2011
7979165 Mass flow rate control apparatus, its calibration method and semiconductor-producing apparatus Jul. 12, 2011
7971604 Flow controller delivery of a specified-quantity of a fluid Jul. 5, 2011
7925386 Control device for a pneumatically operated actuator Apr. 12, 2011
7918238 Flow controller and its regulation method Apr. 5, 2011
7881829 Mass flow controller Feb. 1, 2011
7881886 Methods for performing transient flow prediction and verification using discharge coefficients Feb. 1, 2011
7866337 Chemically inert flow controller with non-contaminating body Jan. 11, 2011
7809954 Biometric control of equipment Oct. 5, 2010
7798168 Pressure-based gas delivery system and method for reducing risks associated with storage and delivery of high pressure gases Sep. 21, 2010
7769493 System and method for controlling flow characteristics Aug. 3, 2010
7743114 Automated data delivery systems Jun. 22, 2010
7723700 Controlling the flow of vapors sublimated from solids May. 25, 2010
7699070 Shutoff valve apparatus and mass flow control device with built-in valve Apr. 20, 2010
7658204 Semiconductor manufacturing apparatus enabling inspection of mass flow controller maintaining connection thereto Feb. 9, 2010

1 2 3 4 5 6 7 8 9

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