I pulled the cap to a tire's air valve out of my pocket and showed it to her.
Like the pistons, the air valves are also controlled by various muscles.
The gyros were connected to air valves on an associated supply line.
"Of course, the only thing is, it is hard to conceal the air valve."
One heroic figure could be seen wrestling impotently with the air valve.
Though effective, sometimes large numbers of air valves need be installed.
The troops leave the containers, with the air valve open, inside their foxholes for 10 to 12 days.
Once inside he set the pumps going to clear the chamber of water, simultaneously cracking an air valve.
She solved the problem for them by quietly closing her air valve when they stopped to rest.
Quickly they closed off the air valve again and excitedly brushed away the mud with their hands.
