Can someone explain how the above boost control setup would work. The valve on the left uses a vac source applied to the top of the diaphram which would effectively help hold the spring closed at high boost levels providing high boost than a single valve setup would. I assume this would be used to give a large boost control range (similar to a CO2 boost controller). Is this correct?
I'm not sure what the D port on the actuator does though, I assume that D and E are both connected and would both work against the spring opening it?
What control circuit would be required to drive the two valves. Would you need a split range controller with two different duty curves, or could you run them from a single controller with a single curve, eg run the two valves from a single PWM output?