Auxiliary Pilot Valve Overrides A First Pilot Valve Patents (Class 251/19)
  • Regulating overtravel in bi-furcated plugs for use in valve assemblies
    Patent number: 11079032
    Abstract: A gap control device that works with a plug on a valve assembly for use in high-temperature applications. The plug may include two parts and a compressible seal that, when compressed, engages with an adjacent wall of a cylinder or “cage” typical of a trim assembly. In one embodiment, the gap control device forms a hard stop that expands in response to high temperatures. This feature prevents excess over-travel between the two parts of the plug in the high-temperature applications so as to limit stress and wear on the compressible seal.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: August 3, 2021
    Assignee: Dresser, LLC
    Inventor: Thomas Henry Cunningham