Where in the IEC standards is it specified that adjustment and shutdown cannot be shared?
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I would like to ask everyone whether an electromagnetic valve can be added to a control valve to achieve an emergency shut-off function. It is stated online that, according to IEC requirements, it is not allowed to use the same component for both control and shut-off functions in devices of category Sil1 and above. Could you tell me where these IEC regulations come from?
According to national standards, Sil1 is considered acceptable for use. Above sil1, this method cannot be used
The form adopted for emergency shutdown is the result of an SIS (here referring to functional safety management, not hardware) assessment； The main basis for SIS evaluation is GB/T 21109 (IEC 61511) \"Functional Safety of Safety Instrumented Systems in the Process Industry\" ； There are no specific direct standards regarding whether to use a separate shut-off valve or a control valve + solenoid valve. But some design firms have internal specifications. In general: Straight-stroke control valves do not have a full shut-off function (usually, the SIL rating for straight-stroke control valves is 1) ； Regulating valves with rotary cores tend to have a higher SIL rating ； Valves with a SIL rating of 3 are very rare ； Therefore: If a leak in the control valve could lead to explosions, fires, or poisoning, an independent emergency shut-off valve should be used ； Otherwise, a control valve + solenoid valve can be considered. .
Can an electromagnetic valve be added to a control valve to achieve an emergency shut-off function? https://168won.com/view/fcssq/index.htmlhttps://168won.com/view/shishicai_xy/ssc_index.htmlhttps://168won.com/view/*ngyft/pk10kai.html
Can control valves meet the sealing requirements?