What is the pressure of the pressure relief valve in mine rescue gear?

The pressure relief valve in mine rescue gear is typically designed to operate within the range of 2 to 5 mbar. This range is crucial because it allows for the safe release of excess pressure within the equipment, preventing potential failures or malfunctions that could compromise the safety of the individuals using the gear during a rescue operation.

Maintaining pressure within this specified range is essential for ensuring that the mine rescue gear functions effectively. If the pressure were too low, it could lead to inadequate breathing air supply, while excessive pressure could pose a risk of damage to the respiratory equipment or harm to the user.

The other choices either fall below or above this standard range, thereby not providing the necessary safety margin designed into mine rescue equipment. Understanding the designated pressure levels helps ensure that mine rescue operations can be carried out safely and effectively, thus enhancing the overall safety of rescue personnel.