The Secondary Oxygen Regulator (SOP) controls the ventilation pressure within the Extravehicular Mobility Unit (EMU) when the primary pressure control module becomes disabled.

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The regulator steps down high supply pressure to suit pressure in two stages. The design accommodates failure of either stage without jeopardising the astronaut.


The secondary oxygen regulator is used to regulate the oxygen supply pressure coming from the secondary tank. The reliability of this regulator and the actuation mechanism that controls it is critical.

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