Valve body with dual sense mechanism

  • US 8,286,660 B2
  • Filed: 04/21/2009
  • Issued: 10/16/2012
  • Est. Priority Date: 04/21/2008
  • Status: Active Grant
First Claim
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1. A fluid regulating device, comprising:

  • a regulator valve having an inlet, an outlet, and a valve port disposed between the inlet and the outlet;

    an actuator coupled to the regulator valve and comprising an actuator valve disc, the actuator valve disc disposed within the regulator valve and adapted for displacement between a closed position engaging a downstream side of the valve port and an open position disposed away from the valve port;

    a secondary device coupled to the regulator valve and configured to sense an input pressure and to perform a responsive action if the sensed input pressure varies from a secondary device setpoint pressure;

    a Pitot tube having a first end with a sensing point disposed within the outlet of the regulator valve, a first branch extending toward the actuator, and a second branch extending toward the secondary device, wherein the first end and the first branch of the Pitot tube place the sensing point and the outlet in fluid communication with an interior of the actuator, wherein the first end and the second branch of the Pitot tube place the sensing point and the outlet in fluid communication with an interior of the secondary device, wherein the actuator is configured to cause the actuator valve disc to move toward the valve port when the pressure at the sensing point of the Pitot tube increases and to cause the actuator valve disc to move away from the valve port when the pressure at the sensing point decreases to maintain a pressure downstream of the fluid regulating device approximately equal to a regulator setpoint pressure, and wherein the pressure at the sensing point is the input pressure of the secondary device; and

    one of (a) through (c), as follows;

    (a) wherein the secondary device comprises a slam shut safety device comprising a slam shut plug, the slam shut plug disposed within the regulator valve and adapted for displacement between a closed position engaging an upstream side of the valve port and an open position disposed away from the valve port, wherein the secondary device setpoint pressure is a maximum setpoint pressure that is greater than the regulator setpoint pressure, and wherein the responsive action of the slam shut safety device is causing the slam shut plug to engage the upstream side of the valve port to close the regulator valve and stop a fluid flow through the regulator valve when the pressure at the sensing point exceeds the maximum setpoint pressure, and wherein the slam shut safety device is configured so that the slam shut plug must be manually reset to the open position after slam shut plug moves to the closed position,(b) wherein the secondary device comprises a slam shut safety device comprising a slam shut plug, the slam shut plug disposed within the regulator valve and adapted for displacement between a closed position engaging an upstream side of the valve port and an open position disposed away from the valve port, wherein the secondary device setpoint pressure is a minimum setpoint pressure that is less than the regulator setpoint pressure, and wherein the responsive action of the slam shut safety device is causing the slam shut plug to engage the upstream side of the valve port to close the regulator valve and stop a fluid flow through the regulator valve when the pressure at the sensing point falls below the minimum setpoint pressure, and wherein the slam shut safety device is configured so that the slam shut plug must be manually reset to the open position after slam shut plug moves to the closed position, and(c) further comprising a cylindrical housing disposed in the regulator valve and having an inner diameter that is sized and configured to slidably receive the actuator valve disc when the valve disc moves between the open and closed positions, wherein the housing includes a passage therethrough to which the first branch of the Pitot tube is connected to place the sensing point of the Pitot tube in fluid communication with the interior of the actuator, wherein the actuator comprises an actuator stem operatively connected to the actuator valve disc to move the actuator valve disc between the open and the closed positions, and a stem guide disposed within an actuator mouth of actuator proximate the regulator valve and slidably engaging the actuator stem, wherein the stem guide includes channels therethrough such that the first branch of the Pitot tube, the passage of the housing and the channels of the stem guide place the sensing point of the Pitot tube in fluid communication with the interior of the actuator.

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