The answer to 'shut-off valve making gurgling noise' is that a gurgling sound coming from a shut-off valve is typically a sign of a problem with the valve. This could be caused by a buildup of debris, mineral deposits, or a faulty valve mechanism.
Some common symptoms of a problematic shut-off valve include the gurgling noise, difficulty turning the valve, or water leaking around the valve. In some cases, the valve may need to be replaced if it is severely corroded or damaged. For minor issues, you may be able to try cleaning the valve or adjusting the packing nut to stop the gurgling. However, if the valve is difficult to operate or the gurgling persists, it's best to call a professional plumber to inspect and repair the valve.