Yep, you need to be careful, those wooden valves are pretty light.

Seriously, I don't understand this last post (unless it's Nuclear). You wouldn't use Cast Steel valve weights for Cast Iron or Bronze valves. Stainless valves many times are a little different than Carbon Steel but the weight's not that much different. If you're adjusting vavle weights for the difference in density between Steel, Stainless and Chromium steels, then you're really splitting hairs. The weight difference between manufacturers is greater than that. And if you buy a Crane Valve, that valve is most likely NOT going to be the one shown in their catalog, but the one of their current supplier.