Transcription of BASIC OPERATION AND FUNCTION OF CONTROL VALVES
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BASIC OPERATION AND FUNCTION OF CONTROL VALVES
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 - SUBJECTSECTIONT erminology------------------------------ -------------------------------- 1 CONTROL Valve BASIC Designs --------------------------------------- 2 Characterization and Trim Design -------------------------------- 3 CONTROL Valve Technical Considerations ----------------------- 4 Force-Balance Principle ---------------------------------------- ----- 5 Actuator BASIC Designs ---------------------------------------- ------ 6 CONTROL Valve Unit Action ---------------------------------------- --- 7 Actuator Benchset Range ---------------------------------------- --- 8 Valve Positioner basics ---------------------------------------- ------ 9 CONTROL Loop Action
characteristic, flow: An indefinite term, see “characteristic, inherent flow” and “characteristic, installed flow.” - characteristic, equal percentage: An inherent flow characteristic which, for equal increments of rated travel, will ideally give equal percentage changes of the existing flow coefficient (Cv).
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