Annulus Patents (Class 137/860)
  • Control valves
    Patent number: 4095617
    Abstract: A pressure compensated directional control valve is provided which automatically regulates the position of the valve depending upon the load so as to maintain a constant flow of fluid by means of check valve members in the spool in the form of a resilient or flexible band in a groove surrounding the valve spool and covering the outer ends of the radial passages from the internal spool chambers.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: June 20, 1978
    Assignee: Commercial Shearing, Inc.
    Inventor: Robert F. Hodgson
  • Sealing member for valve stems
    Patent number: 4072161
    Abstract: An all-plastic valve having a unitary body has a cap assembly for excluding external contaminants from the interior of the valve while allowing venting of excess pressure from the interior.
    Type: Grant
    Filed: August 16, 1976
    Date of Patent: February 7, 1978
    Assignee: Rockwell International Corporation
    Inventors: E. Frederick Schoeneweis, Leonard J. Stephens
  • Flow control aerator
    Patent number: 4000857
    Abstract: A flow control device that maintains a constant flow rate and is arranged to produce a regulated, aerated stream on the discharge side.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: January 4, 1977
    Inventor: Alfred M. Moen