Dumb question of the day:
Scroll has no intake valve, yes? But does have a discharge valve after where gas is forced out of the center of the scroll set, yes?
can't shoot you for asking,
"when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY
I see a discharge check, but nothing in front of the scroll. So my original assumption seams unchallenged.
Thanks for the pic.