ESD VALVE SELECTION GUIDE GENERAL ESD VALVE …

ESD VALVE SELECTION GUIDE . GENERAL ESD VALVE DEFINITION. ESD/ESV valves are the final defence against proc- ess misreactions. These valves have a function which requires much more reliable performance than standard remotely operated on-off valves . Still today ESD valves are ranked often as ordinary shut-off valves in specifications. valves as such may still remain the same but being a part of Safety Instrumented Function (SIF) the performance expectations are much higher. There must be a prove for a reliable long term performance. MTBF. (Mean Time Between Failure) number needs to be given to Safety calculations (SIL). ESD / ESV valves are in modern systems con- nected to Programmable Locig Controller (PLC) This is the most critical situation for valves .

Actuator type Pneumatic double acting, pneum. spring return, rolling diaphragm spring return or double acting, elec-tric, hydraulic Fail safe function Fail to close, fail to open, fail in place Supply pressure min 3,5 bar, max. 8,5 bar Operating speed See below for actuators, use QEV's or AOV's to speed operation, also large size SOV is alternative

Tags:

  Valves, Return, Pneumatic, Spring, Actuator, Spring return

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