Leaky flat-top gate valve
#1

My copper return line from my boiler is leaking at the stem of the 1 1/4" brass flat-top gate valve. Since it doesn't have a typical packing nut to tighten or repack, I'm unsure if it can be packed with teflon thread. The valve body does have hex sides (just behind the handle) for a pipe wrench but so far I've had no luck tightening or loosening this part. Short of replacing the entire valve, does anyone have any advice?
#2
IF you cannot repack the valve stem packing with teflon ROPE,not tape, I guess you will need to replace the valve. Since that seems imminent, I would for sure take the valve apart, in place, and see if repair was possible, before I replace it. Nothing to lose.