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QUARTER TURN BALL VALVE WITH LIFT-OFF SEATS

  • US 20150137018A1
  • Filed: 10/22/2014
  • Published: 05/21/2015
  • Est. Priority Date: 11/19/2013
  • Status: Active Grant
First Claim
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1. A quarter-turn valve comprising:

  • (a) a valve body having a tubular bore flow passage and an intersecting transverse port, wherein the transverse port is closed on one end with a bonnet flange;

    (b) a ball valve housed within the valve body and having a valve flow passage, wherein the ball valve is rotatable about a rotational axis transverse to valve flow passage to either an open position, where said valve flow passage is aligned with the bore flow passage to permit flow, or a closed position, where the valve flow passage is misaligned with the bore flow passage to prevent flow;

    (c) an arcuate groove concentric with the rotational axis on an upper face of the ball valve;

    (d) a pair of opposed ball seats with each seat having a cam pocket, wherein the ball seats are axially reciprocal between a first seat position where each ball seat has a spherical sealing face sealingly comated with a sealing surface of the ball valve and a second seat position where each ball seat is displaced from the sealing surface of the ball valve;

    (e) a rotatable cam attached to the valve ball with a cam axis of rotation concentric with the rotational axis of the ball valve, the cam having(i) an eccentric camming disk selectably rotatable to engage the cam pocket of each ball seat, wherein the ball seats are reciprocated between the first seat position and the second seat position by rotation of the eccentric camming disk, and(ii) a camming pin rotationally engaged in the arcuate groove of the ball valve;

    (f) a rotatable valve stem rotationally engaged with the cam and the ball valve; and

    (g) a flow restricting means for restricting the flow around the ball valve whenever the ball seats are in the second seat position.

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