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 ---------------------------------------- ---------- 10 CONTROL Valve Packing Designs
lubricator isolating valve: A manually operated valve used to isolate the packing lubricator assembly from the packing box. lubricator packing box: A packing arrangement consisting of a lantern ring with packing rings above and below with provision to lubricate the packing. mechanical limit stop: A mechanical device to limit the valve stem travel.
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