This depends what shut off valve is in question here. Where the leak is and what type of material is the shut off valve made of.
the hot water valve shut off valve shuts off the hot water. The cold water valve shuts off the cold water. ;()
What to use to solder a shut off valve
An air-intake engine shut-off valve regulates air-flow to the motor, and operates as an emergency shut-off valve. There are also shut-off valves on water hoses, so shut-off valves really control the inflow of any liquid or gas.
where is the fuel shut-off valve on a 1998 4 runner?
The shut off valve.
It doesn't need a shut off valve. In fact only Ford Motor Company installs fuel shut off valves in their cars.
shut off valve filters in tank stopped up or the valve is bad.
A gate valve is positive shut off and used for on of off . A globe valve is for throttling
The valve seat or washer on the main valve are not seating/sealing properly.
I take it that you are mounting it out side, put the shut off valve in side, with a drain on it,
Means you can shut it off from a distance. Useful either in an automatic system or if you don't want to have someone being around the valve when it's time to shut it off.