: I found that when I shut the water off at the meter, I was still
: getting water out of the kitchen and bathroom faucets (although
: it was definitely a reduced flow). Is there enough residual pressure
: in the expansion tank (diagphram type) that it is driving some water flow to these
: fixtures?

: I noticed that there is a gate valve immediately "upstream" from the
: expansion tank. Do I need to close this valve to isolate the
: expansion tank to do work on the system? If so, then this would only
: shut off pressure to the cold water fixtures. The pressure in
: the expansion tank would still be forcing water through the hot
: water heater and to the hot water fixtures, right?

Andy, shut off the meter and then open up your outside faucets and the water in the system above the hydrants will drain down. You will have a little pressure from the expansion tank but not that much to worry about. Make sure the city valve is closed all the way. I have run accross bad valves in my time that the city had to change. Dale's Plumbing Service LMP