Q: I had to turn off the water supply valve at the top of my water heater. So I turned it, but it kept on turning and turning without shutting off the water. A neighbor of mine said it is a gate valve ...

Turn off the shutoff valve to the gas line. Be sure to turn the valve one-quarter turn so that the handle is at a right angle to the pipe, as in this photo. Turn off the control valve. Remove the ...