I'd install a sea **** even if you have to go with a gate valve (as opposed to a ball valve). If you have to use the 90 elbow, that's what you have to do, but I'd think that sharp a bend might lead to problems (blockage?) down the road.
Capt. Douglas Abbott
USCG/MCA IV/C.I./M.I. 500-ton Oceans
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