(Corrects to say the deal is for Circor Aerospace, not the whole firm, in headline, paragraphs 1 and 2) May 21 (Reuters) – U.S. investment firm KKR said on Thursday it would sell aerospace division of Circor to motion control products maker Parker-Hannifin for $2.55 billion. Circor Aerospace, which makes components for commercial aircraft, is expected to strengthen Parker-Hannifin’s presence in high-margin aerospace systems. The deal is pr…