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System, method and apparatus for combined ball segment valve and check valve

  • US 9,234,598 B2
  • Filed: 05/08/2014
  • Issued: 01/12/2016
  • Est. Priority Date: 05/08/2014
  • Status: Active Grant
First Claim
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1. A valve apparatus, comprising:

  • a ball segment valve housing;

    a check valve housing coupled to the ball segment valve housing such that a longitudinal opening is defined through the ball segment valve housing and the check valve housing;

    a ball segment disposed within the ball segment valve housing, the ball segment operable to be rotated to a closed position wherein a generally curved end of the ball segment is in sealing engagement with a ball segment valve seat disposed within the ball segment valve housing to prevent the flow of a working fluid through an outlet of the longitudinal opening, and operable to be rotated to an open position wherein the generally curved end of the ball segment is at least partially disengaged with the ball segment valve seat to permit flow of the working fluid through the outlet; and

    at least one flapper door disposed within the check valve housing, the at least one flapper door operable to be rotated to;

    a closed position wherein the at least one flapper door is in sealing engagement with a flapper valve seat to prevent flow of the working fluid through the longitudinal opening in a first direction, wherein the at least one flapper door is longitudinally spaced from the ball segment when the at least one flapper door and the ball segment are both in their respective closed positions to define an isolated chamber within the longitudinal opening between the at least one flapper door and the ball segment; and

    an open position wherein the at least one flapper door permits flow of the working fluid through the flapper valve seat in a second direction, and wherein the at least one flapper door extends from the check valve housing into the ball segment valve housing such that the at least one flapper door longitudinally overlaps the ball segment when the at least one flapper door and the ball segment are both in their respective open positions.

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