An internal pressure explosion-proof system is provided that is capable of
detecting high-pressure abnormality of an internal pressure
explosion-proof mechanism, urging a check of gas/air apparatus by
providing a means for notifying a user of abnormality, and decreasing
excessive pressure of an internal pressure chamber. A high-pressure
abnormality detector and a pressure regulating valve are provided in an
air discharging portion for releasing the gas/air discharged from the
internal pressure explosion-proof mechanism. The working pressure of the
high-pressure abnormality detector is set to be lower than the working
pressure of the pressure regulating valve. The high-pressure abnormality
detector sends a signal when the pressure becomes higher than the set
pressure to make the alarm give a warning and makes the open valves open
to decrease the pressure of the internal pressure chamber of the internal
pressure explosion-proof mechanism which became excessive.