BASIC OPERATION AND FUNCTION OF CONTROL VALVES

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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 ---------------------------------------- ---------- 10Control Valve Packing Designs ----------------------------------- 11Seat Leakage ---------------------------------------- -------------------- 12- 3 -SECTION

- rotary: A closure member which is rotated into or away from a seat to modulate flow. coefficient, flow: A constant (Cv) related to the geometry of a valve, for a given valve travel, that can be used to predict flow rate. control valve: A valve which controls the flow rate or flow direction in a fluid system. The final control

  Control, Rotary