×

Plug valve

  • US 4,262,880 A
  • Filed: 06/29/1979
  • Issued: 04/21/1981
  • Est. Priority Date: 06/29/1979
  • Status: Expired due to Term
First Claim
Patent Images

1. A plug type valve comprising:

  • a valve body having a generally cylindrical plug member receiving opening therethrough between opposite actuating and locking end faces, fluid inlet and outlet openings communicating with said opening generally radially thereof, a plug member including a generally cylindrical plug portion rotatably received in said valve body opening and having an outer surface, opposite actuating and locking ends, and a lateral flow passage therethrough with inlet and outlet ends, circumferential seal receiving grooves in said outer surface adjacent said actuating and locking ends, seals received in said seal receiving grooves and being in sealing engagement with the periphery of said plug member receiving opening, said locking end of said plug portion extending outwardly beyond said locking face on said valve body and having a circumferential snap ring groove therein removably receiving a snap ring extending outwardly in overlapping relationship to said locking end face, a continuous groove in said outer surface intermediate said seal receiving grooves and said inlet and outlet ends, a continuous seal received in said continuous groove and being in sealing engagement with the periphery of said valve body opening, said continuous seal encompassing a closed seal area for sealingly surrounding said inlet passageway, a pressure relief groove extending generally circumferentially of said plug portion from said outlet end of said flow passage over a small arc in said outer surface located on the opposite side of said inlet and outlet ends from said continuous groove, said outer surface of said plug portion being smooth and ungrooved adjacent said inlet and outlet ends of said flow passage except for said pressure relief groove, a manual actuator on said plug member at said actuating end and including a generally flat actuator face extending outwardly beyond said plug portion outer surface in overlapping relationship to said actuating end face on said valve body, said actuator face having a recess therein with opposite recess ends defining stop surfaces, a projection on said valve body extending into said recess for cooperation with said stop surfaces to limit rotation of said valve body between a closed position in which said continuous seal surrounds said inlet passageway and an open position in which said inlet and outlet ends of said flow passage are in fluid communication with said inlet and outlet passageways, said pressure relief groove passing across said outlet passageway subsequent to complete movement of said inlet end past said inlet passageway during movement of said plug portion from said open position toward said closed position, and said recess and projection cooperating for providing complete insertion of said plug portion through said valve body opening for positioning a snap ring in said snap ring groove only when said plug portion is properly rotatably oriented for insuring alignment of said continuous seal in surrounding relationship with said inlet passageway and of said inlet and outlet ends respectively with said inlet and outlet passageways when said plug portion is rotated between said closed and open positions.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×