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Explanation: this is just a suggestion. I do know active switches, switch valves or switchable valves. Never heard of active switchable valve but then again it doesn't seem impossible. I also have heard of schaltbares ventil but not of aktiv schaltbares ventil.
There are plenty of references in google to switchable valves
usually a control valve is a Steuerventil, Regulierventil, Wegeventil...
and a switch valve is ususally a Umschaltventil
hope it helps a bit!
Elisa Capelão Local time: 11:27 Native speaker of: Portuguese PRO pts in pair: 117