Escalona missed the entire 2012 campaign while recovering from left elbow surgery, but had a successful 2011 season before the injury. The left-hander posted a 2-1 record and a 2.93 earned run average in 49 games for the Astros.
Gonzalez, 29, made six starts for Houston last season after having his contract purchased on Sept. 3 and went 3-1 with a 5.04 ERA.
Valdez was also a September call-up in 2012, compiling a 2.25 ERA over 12 relief appearances.
Crowe split his 2012 campaign between the Indians and Angels minor league systems. He was drafted 14th overall by Cleveland in 2005 and owns a career .245 average with 34 doubles and 29 steals in 205 games, all with Cleveland.