For a 1" globe valve
Cage attributes, hole diameter=.312ø, total holes=24
1-5/16" Port, 3/4" Travel
The area of the 24 holes is greater than the area of the seatring orifice.  Therefore the seat will be the limiting factor.  Your Cv will be around 29.  Also, your characteristic will be "quick opening" since it will be linear up to the point where the seatring becomes the limiting orifice, then additional travel of the plug will not reward you with correspondingly higher flow.
Typical Globe control valves have Cv in the 12-15 range for "full area" trim.  You may find that you have more Cv than you can use, and your valve will be throttling over a narrow band near the seat. 
That ignores totally the flow characteriscs of the valve itself I realize but I'm not sure how to factor that in.  If the Cv you calculate is significantly less than the Cv of a conventional globe valve you should be in good shape ignoring the dP losses through the rest of the valve other than the orifices in the trim.