you using ball valves? those you sweat threaded fittings on the pipe
then they thread onto the valve using teflon tape.
ball valves are the best, they never corrode, leak, or get stiff. a
quarter turn by pushing the lever turns the water off fast in a
emergency. they never obstruct the flow, since open is completely open/
eventually i will have all ball valves here, anytime one is changed or
replaced thats all i install