It is necessary to be clear about definitions of terms.
I think you are looking for a "valid" hypothesis meaning it is well-formed by some set of rules.
Bluescat is saying "valid" means right or wrong.
I think you and I agree. A hypothesis and be a perfectly good, scientific hypothesis but could still turn out to be wrong.
I think you need to suggest a new term other than "valid" (though I agree it is a good word). I guess I am putting forward "well-formed".