This is a good topic as I am using a KIP 24 V solenoid valve for the HLT hot water flow to the MT and for the autofill for the cold water to the HLT.
Pilot Operated Solenoid Valve
I like my iipa's with a lot more flavor, aroma and dry that what you have listed. When I brew a iipa I dry hop with around 5 oz and will use about 5 oz or so in the last 20 min of the boil.
he actuation time was in the 10-15 second range which should not be to bad, not instant like a solenoid but it is more of a bullet proof method when dealing with flow in both directions.