Roger Mills (aka Set Square) wrote:

No - Danfoss 3-port valves are spring return

Yes, they are. So some of the Sunvic 2-port actuators are mo-mo.

and the motor continuously
runs stalled in the mid and CH positions.

I meant the 2-port valves. The spring return to closed on power failure
is a safety feature in some installations, so the OP would have to
devise a safe installation if he went for the motorized valves.