Question 121Gas Turbine - Assistant Engineer

The correct answer is C) Opens completely at a specified lift pressure and remains open until a preset pressure is attained. The bleed air surge relief valve differs from a normal relief valve in that it remains open after being activated, rather than closing immediately after reaching the specified lift pressure. This allows the valve to continue releasing pressure in the system until it drops to a preset level, rather than just venting momentarily. This functionality helps to prevent pressure surges and stabilize the system. The other options do not accurately describe the behavior of a bleed air surge relief valve.