Why does the Torah refer to the Paroches as "Paroches ha'Kodesh"?
Rashi: To teach the Kohen that he must sprinkle the blood at the point that faces between the poles of the Aron on the other side of the Paroches. 1
Though the blood did not need to touch the Paroches (Rashi).
Why does he sprinkle seven times?
Moshav Zekenim: It atones for "Sheva To'avos Nafsho" (Mishlei 6:16) and removes from them "Sheva k'Chatoseichem" (26:21).