Shuttle valves for low pressure drop.
低压阀门下降班车。
One of these valves - which maintain tank pressure during liftoff - broke during the last shuttle launch in November.
其中一个用于在发射时保持燃料箱压力的阀门，在11月的发射前破裂。
One of these valves - which maintain tank pressure during liftoff - broke during the last shuttle launch in November.
其中一个用于在发射时保持燃料箱压力的阀门，在11月的发射前破裂。
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