Final answer:
The safety valve mentioned in the question is likely a pressure relief valve, which is used to automatically reduce pressure to a safe level.
Step-by-step explanation:
In the context of the question, the subject is Physics. The safety valve mentioned in the question is likely a pressure relief valve, which is used to automatically reduce pressure to a safe level.
The specific pressure at which it is set to automatically reduce pressure will vary depending on the application. For example, in a pressure cooker, the safety valve may be set to vent steam if the pressure exceeds a certain level, typically around 3.4 atm.