First attempt did not fire, attention is focused around oxygen valve and electronics.

Borowski checked each one's oxygen valve and connections as they stepped up to the hatch, where Charlie Chan helped them through.

Then Charlie turned the oxygen valve onto full supply and I was back in the plane again.

Slowly he turned up the oxygen valve, cursing fluently.

Penton clamped down Blake's oxygen valve, and heaved him to his feet, starting him running.

Earlier this week a defective oxygen valve held up the countdown and had to be replaced.

He signalled the others to close their faceplates and turn on oxygen valves.

An oxygen valve had stuck open and a blocked vent caused the gas to build up until a spark ignited it.

Eden swallowed and shut off the oxygen valve.

The oxygen non-return valve should not have failed.