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Selection of Safety Valves

ESD/ESV valves are one of the defense in protection layers against process hazards. These valves have a function which requires much more reliable performance than standard remotely operated on-off valves. IEC 61508 is a globally recognized new safety standard specific to process industry. Very strong guidelines are given there to process operators to test and prove the availability and functional safety of the safety loop including the final elements and ESD valves.Part 1 of the IEC 61508 demands certain documentation requirements for the development of safety critical devices. The selection of a specific type of safety valve is governed by several factors: -    Cost-    Valve construction-    Approvals-    Operating characteristics-    T...
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