A control valve failure may also cause the liquid level in a pressurized vessel feeding liquid to a tank to drop below the outlet nozzle, allowing vapor from the vessel to be pressured into the tank.

• 控制阀故障还会导致向储罐供液体料的压力容器液位降低到其出口管嘴以下，使得蒸气从压力容器压入储罐。