N/A Do ALL Regulators use Belleville Style Washers?

I'm thinking they also use Belleville washers cause if you order one you have a option to get spare parts and one of them is the washers
Yes, it looks like some models do and some do not.
I suppose its a matter of size.
Seems like a great idea, when possible, to use a single compression spring, as opposed to multiple Belleville washers.
I just spent an hour watching several of their videos, attempting to educate myself.
Very intersting products.