It's not, quite (and I'm hoping a native speaker will comment), but I think it's kind of between an English V and a W. Like you voice it without closing your teeth as hard against your lower lip as you do with an English V? (I'm noticing that the more clearly I enunciate the English V, the more my teeth move toward the front of my lower lip, and the harder I bite down. The Turkish V sounds to me like the opposite of that process: like my teeth should be touching the back of my lip, and like they should barely be touching.)
I agree with your explanation of how to pronounce the Turkish V. And many thanks for explaning the English one :) I am having difficulty pronouncing it.
I think the Turkish V is similar to W but you don't round your lips unless you use it with rounded vowels such as u and o.
Thanks! (And I'm glad the explanation of the English one helps -- I was sitting here, this morning, saying, "very..... very...... very?" to myself, and trying to figure out what I was doing to make the English V sound, and how that changes for softer V's like the Turkish and Spanish ones. I'm sure my family thought I was crazy. =) )