Patents by Inventor David Horsfield

David Horsfield has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Automated valve testing apparatus
    Patent number: 8540211
    Abstract: A method for partially stroking an emergency valve apparatus is provided. The emergency valve apparatus comprises an actuator (103) and a valve member (101). The apparatus is movable between a first position and a second position. The method comprises the step of initiating a partial stroke movement of the apparatus from the first position towards the second position. A parameter of the fluid acting on the apparatus is measured. Once the measured parameter reaches a threshold value, the partial stroke movement is reversed.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: September 24, 2013
    Assignee: Norgren Limited
    Inventors: Christopher John Wheater, David Horsfield
  • AUTOMATED VALVE TESTING APPARATUS
    Publication number: 20110114191
    Abstract: A method for partially stroking an emergency valve apparatus is provided. The emergency valve apparatus comprises an actuator (103) and a valve member (101). The apparatus is movable between a first position and a second position. The method comprises the step of initiating a partial stroke movement of the apparatus from the first position towards the second position. A parameter of the fluid acting on the apparatus is measured. Once the measured parameter reaches a threshold value, the partial stroke movement is reversed.
    Type: Application
    Filed: July 25, 2008
    Publication date: May 19, 2011
    Applicants: Norgren Limited, Thompson Valves LTD
    Inventors: Christopher John Wheater, David Horsfield