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Means and method for in-line removal of seat rings in ball valves

  • US 4,175,577 A
  • Filed: 05/03/1978
  • Issued: 11/27/1979
  • Est. Priority Date: 05/03/1978
  • Status: Expired due to Term
First Claim
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1. A method for removing a spring-loaded seat ring from a ball valve having a body in which a ball is mounted for rotation and a cover plate is removably connected to the body for permitting removal of the ball and seat ring, the seat ring being mounted for longitudinal movement between a retracted position spaced from the ball and an extended position biased into sealing relation with the ball;

  • said method comprising the following steps;

    removing the cover plate from the valve body to permit access to the ball;

    inserting a cam within the valve body and positioning the cam on the ball in a spaced relation to the adjacent seat ring;

    then rotating the ball so that the cam engages the seat ring upon such rotation and cams the seat ring into a retracted position spaced from the ball;

    actuating a seat ring retainer manually to hold the seat ring in the releasable retracted position;

    then removing the cam and ball;

    and releasing the seat ring for removal from the valve body.

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  • 3 Assignments
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