Precision Castparts to Sell Branches  CHICAGO (Reuters) - Precision Castparts Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=PCP.N target=/stocks/quickinfo/fullquote"&gt;PCP.N&lt;/A&gt;,  which makes jet engine components, on Friday said it will sell  its pump and valve businesses because they are not core  businesses.