Shut-off valve, also known as fow control valve, is a mechanical fow control type one-way check valve. It is usually installed in the pipeline between the transformer and oil conservator. When the transformer due to internal failure or other reasons
results in a large amount of oil overfall or leakage, the fow control valve has the
function of “Shut down once oil is discharged”, can cut off the oil path between
oil conservator and transformer tank immediately, so that the oil conservator will
no longer fll the tank. It is a very ideal auxiliary safety protection device for oil-
immersed power transformer.