The one I posted can indeed not be overrided for both positions. Default setting (for this one) is closed. If you switch it off, then it will stay closed, which is what I want (I think). I.e.: no noise, also no noise under accelleration. If you switch it on, then there would only be noise under accelleration. Not while starting the car, stationary or while cruising.
The electric valve would provide more control indeed. But that one can't be set in such a way that it only opens under accelleration....