Patents Represented by Attorney, Agent or Law Firm Stetina Grunda Garred & Brucker
  • Patent number: 6776392
    Abstract: A retractable plug assembly for engaging a seat ring seating surface comprises a plug housing, a plug body, a retainer ring, a wear ring, a spring retainer and a valve spring. The plug housing has the plug body slidably disposed therewithin and defines a plug body seating surface. The wear ring is mounted to the retainer ring and extends downwardly therefrom to define a wear ring bottom face positioned downwardly relative to the plug body seating surface. The valve spring, captured between the spring retainer and the plug housing, biases the plug body away from the seat ring during engagement of the wear ring to the seat ring such that inwardly flowing fluid is prevented from directly impinging the plug body seating surface. The valve spring deforms during downward movement of the plug body such that the plug body seating surface engages the seat ring seating creating a fluid-tight seal.
    Type: Grant
    Filed: April 24, 2003
    Date of Patent: August 17, 2004
    Assignee: Control Components, Inc.
    Inventor: Michael N. Reilly