英语翻译
Valves
Thesymbolsforautomatedvalvebodiesandformanualvalvesareidentical.
Usetheappropriateactuatorsymbols(e.g.,diaphragmandpiston)todistinguishautomatedvalvesfrommanualvalves.
Comment:Typically,athrottlingcontrolvalveisshownwithadiaphragmactuatorandanon-offvalveisshownwithacylinder/pistonactuator,regardlessofactualtype.
Usethesymbolsdefinedinthelegendsheetforpressureandtemperatureregulators.
Showautomatedvalvefailactionswithtext(FC/FO/FL/FI).
Thiscanalsobeshowngraphicallyusingstemarrows(ref.ISA5.1figure6.7)butthisisnotrecommended
Forautomatedvalves,identifytightshut-offrequirementsbyusingtheabbreviation“TSO.”