I used this same model back in the eighties, before it had the safety device.  I worked fine, as long as I remembered not to open it until the excess pressure had evacuated!  So the safety device is a good idea.  However, when the manufacturer RETO-FITTED this older model with the safety device, it didn't execute the change properly; this one won't work on a hot plate, but has to have a full-power stove burner.  Sorry: cannot recommend.  Buy a modern design with the safety device INTEGRAL FROM THE START.