On Mon, 11 May 2009 10:28:22 -0700, Pilgrim wrote:

What do I need to know and what precautions do i need to take to sweat
solder a 1/4 turn ball valve in 3/4" Cu pipe? The ball turns in a
plastic seat that looks like teflon.


I just heat the pipe then the end of the valve, and let the solder run in.

But there's a neat thing I noticed when buying them at the big supplier.
If you get an untouched one out of the bin and turn the handle to "open" -
you hear a pop. I think they are pressure tested at the factory and that
is residual pressure "popping" out.