BASIC OPERATION AND FUNCTION OF CONTROL …

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BASICBASICOPERATIONOPERATIONANDANDFUNCTI ONFUNCTIONOFOFCONTROLCONTROLVALVESVALVES 02-99- 2 -That valvedrives me crazy!??What ishappening insidethat valve??Gaskets Won't Seal!Unusually HighTrim Maintenance!!Packing Always Leaks!NOISY!!VIBRATING!!Positioner AlwaysNeeds Calibration!Too much seat leakage!LOUSY CONTROL !RATTLING!Table of ContentsTOPIC - SUBJECTSECTIONTerminology--------------- ---------------------------------------- ------- 1Control Valve BASIC Designs --------------------------------------- 2Characterization and Trim Design -------------------------------- 3Control Valve Technical Considerations ----------------------- 4Force-Balance Principle ---------------------------------------- ----- 5Actuator BASIC Designs ---------------------------------------- ------ 6Control Valve Unit Action ---------------------------------------- --- 7Actuator Benchset Range ---------------------------------------- --- 8Valve Positioner Basics ---------------------------------------- ------ 9Control Loop Action

- 5 - - characteristic, inherent: The relationship between the flow coefficient (Cv) and the closure member travel as it is moved from the closed position to rated travel with constant pressure drop across the

  Control, Flows