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Instrument for detecting potential future failures of valves in critical control systems

  • US 5,646,600 A
  • Filed: 01/12/1995
  • Issued: 07/08/1997
  • Est. Priority Date: 01/12/1995
  • Status: Expired due to Term
First Claim
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1. Apparatus for monitoring the health and response of critical control valves by comparing an actual valve response signal with that of a normal valve response signal comprising:

  • a valve;

    a valve actuator to actuate said valve in response to a valve control signal;

    a monitor to monitor the response of said valve upon actuation of said valve to provide a valve response signal; and

    means to compare said valve response signal and a normal valve response signal includingwavelet decomposition means to provide enhanced evaluation signals representing time variations in a time warped valve response signal; and

    means to indicate differences between said enhanced evaluation signals and said normal valve response signal to evaluate the response and health of said valve.

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