What's the longer-valve, metal-ring inner tube style called? I have an innertube for a Chariot stroller that apparently came from Europe, and the local bike shop people couldn't find one in their catalogs that was both the right size and having the thing I'm trying to describe.  I want to search for it myself but don't know what it's called.  It's a longer than normal valve, and has a washer-like thing (metal, but thicker than a washer, and threaded) that you spin down the valve until it locks the valve in place to the rim.  (We need one because we're going through innertubes like crazy--whenever you pump up a Chariot with the compact style pump we have, it wears the crap out of the valve.)  They could find it in the skinny Presta valve diameter but not in the standard valve diameter.

What's it called?  (And if you happen to know, where in Canada can I order one?)

Thanks,
Kev
You can see some images of alternative valves at the Schwalbe page. 
Your local bike shop is certainly familiar with Schraeder (aka "Auto") and Presta (aka Sclaverand) valves.  It's difficult to tell from your description, but it's therefore likely either a Regina or a Dunlop valve.