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Valve Operation And Diagnosis

  • US 20160069772A1
  • Filed: 07/24/2015
  • Published: 03/10/2016
  • Est. Priority Date: 09/10/2014
  • Status: Active Grant
First Claim
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1. A method of diagnosis of a valve assembly of a gas-fired installation, which valve assembly includes a plurality of valve members serially arranged along a flow channel of the valve assembly connecting at least one inlet and at least one outlet of the valve assembly, the method comprising:

  • during an operation of the gas-fired installation, measuring, by at least one flow sensor, a flow of a fluid through the flow channel of the valve assembly,closing at least one of the serially arranged valve members of the valve assembly such that fluid flow is prevented through the flow channel,opening at least one of the valve members of the valve assembly to permit a fluid flow from an upstream side of the at least one valve member to a downstream side of the at least one valve member,measuring, by the at least one flow sensor, at least one signal related to fluid flow,determining at least one quantity characterizing the at least one signal,comparing the at least one quantity to at least one threshold value, anddetermining that the at least one quantity exceeds the at least one threshold value, and in response to such determination, detecting a leakage flow having a flow velocity between 0.1 m/s and 5 m/s caused by at least one faulted valve member of the plurality of valve members,wherein the at least one sensor is configured to (a) detect the leakage flow having the flow velocity between 0.1 m/s and 5 m/s, and (b) measure normal operational flow velocities through the flow channel of the gas-fired installation in operation.

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