Were you referring to your needle valve or your regulator? Because that is the only regulator of its kind I have seen, but I think the S series is not uncommon. I have 3 right now just sitting in my toolbox (thanks to maknwar) and a lot of people have talked about theirs.
Did you just take off the compression fitting and screw the valve right into the solenoid? I didn't think you could do that.... If so, that is a pleasant surprise.