Yes the modern gates are different (2nd pic). They are non replaceable in our modern throw-away-and-buy-a-new-one society. But the older ones could be replaced. Instead of being threaded in, yours just slips on like the patent. I think the ID is correct.Wow I never would have thought of that. The gates on valves I've seen were different, this looks like it could have been a two piece gate. Anyway interesting to say the least. Thanks for solving it Big HH.