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dunk valves
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does anyone know what 'dunk valves' are and what they do or how they work?
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For more on marking an answer as the "Best Answer", please visit our FAQ.If you DO mean a DUMP valve then it is a valve which allows air (normally) to escape very quickly. Its the kind of thing fitted to say a rigid inflatable boat so it can be deflated quickly in order to pack it up, rather than waiting for all the air to escape through the (relatively small) inflation valve.
a Dump valve is also a device on a turbocharger that releases pressure when engine revs drop suddenly, eg change of gear, the only use for this is when it is a recirculating dump valve, it pushes the air back on the turbo fins, otherwise it rarley eliminates turbo lag effectively and just sounds flash
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