×

Integrated process control valve

  • US 5,251,148 A
  • Filed: 06/01/1990
  • Issued: 10/05/1993
  • Est. Priority Date: 06/01/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A process control valve comprisinga fluid valve body having an inlet for receiving fluid, an outlet for discharging fluid, a fluid flow passage connecting the inlet and outlet, and a controllable throttling element which is moveable to selectively vary the cross-sectional area of flow of at least a portion of the passage,actuator means coupled to the valve body and responsive to control signals for selectively moving the throttling element,a first pressure sensor disposed at the inlet of the valve body for producing a first signal representing the pressure P1 of the fluid at the inlet,a second pressure sensor disposed at the outlet of the valve body for producing a second signal representing the pressure P2 of the fluid at the outlet,utilization means for receiving said first and second signals and for developing an output dependent upon the received signals,said utilization means includingmeans for determining the fluid pressure drop across the valve body from the first and second signals,means for storing a predetermined fluid pressure drop value,means for comparing the determined fluid pressure drop with the stored fluid pressure drop value and for producing a difference signal whose magnitude represents a difference between the compared values, andmeans for producing control signals for application to the actuator means to cause it move the throttling element to thereby vary the fluid pressure drop across the valve body to more closely match the stored fluid pressure drop value and reduce the magnitude of the difference signal.

View all claims
  • 8 Assignments
Timeline View
Assignment View
    ×
    ×