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<p>an external hydrocarbon, such as methane gas, is present in the atmosphere, it can be sucked into a diesel engine causing <a href="page.php?w=Overspeed_%28engine%29">overspeed</a> or <a href="page.php?w=Diesel_engine_runaway">over revving</a>, potentially leading to a catastrophic failure and explosion.  When actuated, ESD valves stop the flow of air and prevent these failures.</p>

<p><big>Actuation</big></p>
<p><a href="page.php?w=Image%3ASafety_shutoff_valve.jpg">thumb</a>As shutdown valves form part of a SIS it is necessary to operate the valve by</p><p>
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