The bleed air surge relief valve differs from a normal relief valve in which of the following ways?
Gradually opens at a specified lift pressure and remains open until the pressure drops to a specified preset pressure.
Opens completely at a specified lift pressure and remains open until the pressure drops to a specified preset pressure.
Gradually opens at a specified lift pressure and closes immediately as soon as the pressure begins to drop.
Opens completely at a specified lift pressure and closes immediately as soon as the pressure begins to drop.
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