Liquid ejection apparatus

A liquid ejection apparatus, comprising:

• a liquid ejection head comprising:
• a reservoir tank configured to store liquid;
• an inlet opening which communicates with the reservoir tank;
• and a plurality of ejection openings which communicate with the reservoir tank;
• an air-discharge passage, extending from the reservoir tank, for discharging air in a space in the reservoir tank, to an outside;
• a first sucking device configured to suck air from the reservoir tank via the air-discharge passage;
• a semipermeable membrane which divides a space constituted by the space in the reservoir tank and the air-discharge passage, into a reservoir-tank-side space and a first-sucking-device-side space, the semipermeable membrane allowing communication of the air between the reservoir-tank-side space and the first-sucking-device-side space, the semipermeable membrane inhibiting communication of the liquid between the reservoir-tank-side space and the first-sucking-device-side space;
• and
• a first valve mechanism configured to divide the reservoir-tank-side space into (a) a first space located on a semipermeable-membrane side of the first valve mechanism and (b) a second space located on an inlet-opening side of the first valve mechanism, the first valve mechanism being configured to inhibit fluid from flowing from the first space to the second space, the first valve mechanism being configured to allow fluid to flow from the second space to the first space,
• the first space being located above the plurality of ejection openings.