Patents by Inventor William Xiaoguang Sun

William Xiaoguang Sun 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).

  • Method and apparatus for isolating water valves
    Patent number: 10627010
    Abstract: A method for isolating a water valve for repair or replacement includes closing the valve and thereafter replacing an outlet pipe with an adapter pipe. An expandable plug is used to seal the adapter pipe, after which the valve is opened and an air tube having a bladder on an end thereof is inserted through the valve and expanded to seal the inlet pipe. Thereafter, the stem assembly of the valve or the entire valve itself may be removed for simple replacement of the sealing washer or total replacement of the valve. The apparatus for practicing the method, and including the expandable plug, inflatable bladder, and necessary tubing, plug actuator, and air valve are presented.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: April 21, 2020
    Inventor: William Xiaoguang Sun
  • Method and Apparatus for Isolating Water Valves
    Publication number: 20200032923
    Abstract: A method for isolating a water valve for repair or replacement includes closing the valve and thereafter replacing an outlet pipe with an adapter pipe. An expandable plug is used to seal the adapter pipe, after which the valve is opened and an air tube having a bladder on an end thereof is inserted through the valve and expanded to seal the inlet pipe. Thereafter, the stem assembly of the valve or the entire valve itself may be removed for simple replacement of the sealing washer or total replacement of the valve. The apparatus for practicing the method, and including the expandable plug, inflatable bladder, and necessary tubing, plug actuator, and air valve are presented.
    Type: Application
    Filed: July 30, 2018
    Publication date: January 30, 2020
    Inventor: William Xiaoguang Sun