BASIC OPERATION AND FUNCTION OF CONTROL VALVES
used to predict flow rate. control valve: A valve which controls the flow rate or flow direction in a fluid system. The final control element, through which a fluid passes, that adjusts the flow passage as directed by a signal from a cont-roller to modify the flow rate.
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BASIC OPERATION AND FUNCTION OF CONTROL …
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www.controlglobal.com17. HARD FACING – A material harder than the surface to which it is applied; usually applied to valve seats to resist galling or fluid erosion. 18. SINGLE SEATED – A valve having a plug with a single seat. 19. DOUBLE SEATED – A valve featuring a plug with two seats. 20. BALANCED – A valve featuring a pressure balanced plug with two ...
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