Question 925 Deck Safety

The correct answer is A) allow the wearer to manually give himself oxygen. The bypass valve on a self-contained breathing apparatus (SCBA) is used to provide the wearer with a manual way to deliver oxygen to themselves. This allows the wearer to bypass the normal oxygen delivery system if it malfunctions or they need additional oxygen. The bypass valve lets the wearer directly access the oxygen supply in the SCBA bottle. The other answer choices are incorrect because: B) the exhalation valve, not the bypass valve, allows exhaled gases to pass outside the bottle; C) the pressure relief valve, not the bypass valve, releases excess heat to prevent the bottle from exploding; and D) the regulator, not the bypass valve, controls the pressure of the oxygen entering the body.