Pipe thread connections - what's the trick to getting it right?

I've got a reno under way and put a ball valve in the water supply where the underground supply line enters the house. There is a 3/4" male threaded connector there, so the ball valve threads on.

When I had the handle where I wanted it, it didn't feel tight so I turned it more and I ended up with the handle about 45 degrees around from the top. There was no way I could turn it any further because then the handle would've run into the water line and no chance it was going to turn all the way around again to get the handle where I wanted it anyway.

Making it worse, when we turned the meter on, there was a small leak right at the threads on the ball valve.

It seems like I'm always having this problem. The ball valves on my compressor are also turned around and it drives me crazy. If I stop when vthe handle is where I want it, there's a leak, and if I keep going I end up with the handle in an awkward position. Is there a secret to knowing when to stop turning, and how to keep things from leaking?

In this case I put teflon tape on the inlet pipe before adding the ball valve. Do I need to add some other kind of sealant too, so I can position the handle where I want it without it leaking? I bought some rectorseal but I'm not sure that's the right stuff or not.

Any help in understanding how to get it right is greatly appreciated.

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So what do you use?

While replacing the shower head in my Dad's 46 year home, I broke the shower piping at the threads at the connection to the brass fitting inside the wall that is soldered to the copper water supply line from the faucet. The pipe wasn't threaded in very far and I am pretty sure I got all of the broken thread out. When I thread in a new shower pipe it stops between the 7 and 8 o'clock position and I really didn't want to try to put in the extra 3/4+ turn to line it up correctly. I put about 4 layers of teflon tape on the thread but I get a drip at the thread joint when I turn on the water. I'm thinking that the brass connection inside the wall has worn to a point more than the teflon tape will fill. I was hoping NOT to go into the wall through the bedroom to replace the brass fitting etc, but will do so if there isn't another option. Is there some type of paste - dope, liquid teflon, glue, liquid weld etc that I could use and let dry that would fill in any irregularities in the joint connection and result in a leak proof connection? Thanks
Ken
Northern VA

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