Valve systems for managing air in a fluid ejection system are described herein. One example valve system includes an inlet chamber (206), a return chamber (208) in communication with the inlet chamber (206), and a filter-side chamber (236) in communication with the inlet chamber (206) and the return chamber (208). A first valve (242) controls fluid flow between the filter-side chamber (236) and the return chamber (208), and a second valve (244) controls fluid flow between the return chamber (208) and the inlet chamber (206).