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Device and Method for Determining a Failure Mode of a Pneumatic Control Valve Assembly

  • US 20110001070A1
  • Filed: 07/02/2009
  • Published: 01/06/2011
  • Est. Priority Date: 07/02/2009
  • Status: Active Grant
First Claim
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1. A control valve assembly, comprising:

  • a control valve having a fluid inlet and a fluid outlet, the control valve comprising a valve plug being movably positioned between the fluid inlet and the fluid outlet to control the flow of fluid through the valve;

    an actuator for moving the valve plug, the actuator comprising an actuator housing and a diaphragm mounted within the actuator housing, the diaphragm dividing the actuator housing into at least two chambers, at least one of the chambers including an actuator vent and at least one of the chambers including an actuator control fluid inlet, and a valve stem connected to the diaphragm and the valve plug, the valve stem being arranged to move the valve plug in response to movement of the diaphragm;

    a positioner comprising a positioner control fluid inlet, a control fluid vent, and a control line, the control line being connected to the control fluid inlet;

    wherein the actuator vent is connected to a flow switch capable of detecting a flow condition through the actuator vent, the flow switch being communicatively connected to the positioner.

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