How does a pressure relief valve operate?

A pressure relief valve operates by opening to release excess pressure from a system when it reaches a predetermined set point. This function is critical for preventing overpressure conditions that could lead to equipment failure, damage, or catastrophic events. When the internal pressure of a system exceeds the safe operational limit, the pressure relief valve activates and releases a portion of the fluid or gas to reduce the pressure back to a safe level.

This operation is essential in maintaining system integrity because it helps manage potential hazards associated with overpressure situations. The pressure relief valve effectively acts as a safety device, ensuring that the pressure within a system does not exceed the levels for which it was designed. This is why this choice accurately describes how a pressure relief valve functions.