Air intake shutoff valves (often referred to as AISV or ASOV) and systems provide emergency overspeed shutdown protection for diesel engines and are the most effective way of preventing a runaway situation. The valves completely block the engine air intake system, cutting off an uncontrolled external fuel source and the air required to keep the engine running.  Our air intake shutoff product offerings include AMOT, Chalwyn, Rigsaver and Roda Deaco brands.