55. Gate-valve: Where the blower and oil-pump feeding one or a bank of oil-fired crucible furnaces are not connected to the same source of power, a gate-valve shall be installed in the main oil-supply line.
In the event of air failure, the oil supply shall be stopped immediately by means of the gate-valve.
R.R.Q., 1981, c. S-2.1, r. 20, s. 55.