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A Dawes valve is simply a manual boost controller it enables the user to adjust to desired boost. All it is is a ball and spring, in normal idle or before desired boost pressure vacume flows through the 2 bottom ports and as soon pressure is reached manifold pressure acts on the ball exedes spring tension and allows charge air to flow over the ball and into the vacume side causing a rise in pressure in turn opens the waste gate.

Hope it helps.
 
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