LOAN AGREEMENT ($65,000,000 U.S. REVOLVING LOAN FACILITY, $5,000,000 CANADIAN REVOLVING LOAN FACILITY and $15,000,000 U.K. REVOLVING LOAN FACILITY) dated as of July 12, 2006 AMONG NATCO GROUP INC., as U.S. Borrower, NATCO CANADA, LTD., as Canadian...