Re: Leaking Toilet supply valve
I agree with DJ, you should replace it, however, in the interim, you might once again find the "sweet spot" where it doesn't leak. Assuming the previous users of the valve knew how to operate it, they turned it to full on, then backed off (closed ) a 1/4 turn, I would start with this. Adjust the valve slightly more open/closed to see if it makes any difference. Another trick is to tighten the stem nut just ever so slightly, compressing the stem packing just a tad more, which usually takes care of the leak as well. Continue to tighten the stem nut ever so slightly until the leak stops.
Again, these are stop gap measures for an old, worn out valve, replacement is the best option, and as was recommended, go with a 1/4 turn valve, as these do not have the leak issues that stemmed valves have.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!