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Class Information
Number: 137/488
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled > Fluid pressure type
Description: Apparatus in which the means sensing a change in fluid condition controls the effectiveness of a fluid pressure which is employed for controlling the operation of the flow controlling valve.

Sub-classes under this class:

Class Number Class Name Patents
137/489 Choked or throttled pressure type 198
137/492 Single acting fluid servo 92

Patents under this class:
1 2 3 4

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
8684028 Fuel quality traceable and remote system Apr. 1, 2014
8631819 Gas supply system for pneumatic store ejection utilizing a removable, replaceable and on-board rechargeable gas storage vessel Jan. 21, 2014
8528588 Safety valve drive system Sep. 10, 2013
8490645 Pressure sensor, pressure-differential flow rate meter, and flow rate controller Jul. 23, 2013
8485213 Internal relief valve apparatus for use with loading regulators Jul. 16, 2013
8479734 Overpressure protection system and method for a hyperbaric chamber Jul. 9, 2013
8474480 Actuator control valve Jul. 2, 2013
8424561 Pressure regulator Apr. 23, 2013
8418715 Control system Apr. 16, 2013
8413677 System for accelerating relief valve opening Apr. 9, 2013
8375981 Pressure control valve Feb. 19, 2013
8360096 Low pressure rise rate pilot operated poppet relief valve Jan. 29, 2013
8286661 Bi-directional overpressure shut-off valve Oct. 16, 2012
8286652 Configurable active jerk control Oct. 16, 2012
8230877 Mass flow rate control system Jul. 31, 2012
8196595 Safety override circuit for pneumatic positioner and method of use thereof Jun. 12, 2012
8161993 Subsea system and method for protecting equipment of a subsea system Apr. 24, 2012
8056643 Systems and techniques to actuate isolation valves Nov. 15, 2011
8047225 Method for water hammerless opening of fluid passage, and method for supplying chemical solutions and device for water hammerless opening for which the method is used Nov. 1, 2011
8011382 Bi-modal bleed valve assembly for gas turbine engine Sep. 6, 2011
7992490 Automatic by-pass control system for meat injection machine and method of using same Aug. 9, 2011
7874834 Air fuel ratio sensor of incinerator Jan. 25, 2011
7784488 Valve for allocating available fluid to high priority functions of a hydraulic system Aug. 31, 2010
7775237 Fluid flow control regulator Aug. 17, 2010
7766030 High pressure transducer Aug. 3, 2010
7647940 Device and method for pneumatic valve control Jan. 19, 2010
7621293 Versatile emergency shutdown device controller implementing a pneumatic test for a system instrument device Nov. 24, 2009
7537019 Systems and methods to slowly reduce the pressure in a pressure chamber over time May. 26, 2009
7533690 Multi-functional regulator May. 19, 2009
7491321 Oxidation tank control valve assembly and systems and methods for replenishing a charge of oxygen-containing gas within an oxidation tank Feb. 17, 2009
7484522 Method to control starter/generator cooling fuel flow during engine starting Feb. 3, 2009
7469706 Adjustable pressure double latching valve Dec. 30, 2008
7380568 Water flow controller Jun. 3, 2008
7367349 Method for opening tank shut-off valves in gas feeding systems with connected tanks May. 6, 2008
7318447 Pressure loaded pilot system and method for a regulator without atmospheric bleed Jan. 15, 2008
7314059 Systems and methods for controlling pressure of fluids Jan. 1, 2008
7306195 Anti-icing actuator assembly for pneumatic valve Dec. 11, 2007
7302961 Surge relief valve Dec. 4, 2007
7296586 Gas-regulating unit for regulating a gas pressure in a gas-tight tank Nov. 20, 2007
7284563 Surge relief apparatus and method Oct. 23, 2007
7249610 Ratio controller with dynamic ratio formation Jul. 31, 2007
7240740 Diaphragm valve with pivoting closure member Jul. 10, 2007
7201180 Water supply system Apr. 10, 2007
7147430 Pneumatic valve control using downstream pressure feedback and an air turbine starter incorporating the same Dec. 12, 2006
7073392 Methods and apparatus for pressure compensation in a mass flow controller Jul. 11, 2006
7066710 Pneumatic valve control having improved opening characteristics and an air turbine starter incorporating the same Jun. 27, 2006
7066203 Gas flow control Jun. 27, 2006
7044156 Pipeline protection system May. 16, 2006
7036794 Method for control of a vacuum valve arranged between two vacuum chambers May. 2, 2006

1 2 3 4

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