Good point Dave,
I am gathering that from what zeroprog is saying is that he is wanting to use a 24vdc supply for the valve and to feed that 24vdc into such a regulator.
He has confirmed the valve will operate on 24vdc.
Yes, you are correct Dave, rectified 24vac will bring it past the maximum input for these regulators, but 24vdc should be fine don't you agree?
GreyNomad, (Rob) uses very nice switch mode power supply modules in his designs, that I do believe will handle the 40vdc on the input ok.
Dave, what a shame you did not have your zero-point blue smoke capture canister handy at the time of release?
Paul