Equipment and apparatus used for the heat treatment of milk in a milk process facility, must be fitted with dial thermometers and thermostats accurate to 0.5 degree Celsius (0.5°C) in respect of the entire given series of scales and, in addition to mechanical temperature and time regulators and alarms, such apparatus must have flow-regulating and flow-averting valves by which milk, not subjected to heat treatment, is automatically redirected to the balance tank.