Food companies Sysco Corp. and US Foods said Monday that they have agreed to merge. The value of the transaction, which is expected to close in the third quarter of 2014, is approximately $8.2 billion. Under terms of the agreement, Sysco will pay about $3.5 billion for US Foods’ equity. Sysco will also assume or refinance US Foods’ net debt. After the deal closes, a representative of each of US Foods’ majority shareholders, Clayton, Dubilier & Rice and Kohlberg Kravis Roberts, will join Sysco’s board of directors. Goldman Sachs served as financial advisor to Sysco.