Liquid ejection apparatus and liquid ejection head

A liquid ejection apparatus comprising:

• an ejection port configured to eject a liquid;
• a pressure chamber configured to store the liquid to be ejected from the ejection port;
• an element configured to generate energy for ejecting the liquid in the pressure chamber;
• a first tank and a second tank each configured to be capable of storing the liquid;
• a flow passage configured to establish communication between the first tank and the second tank through the pressure chamber;
• a switching unit configured to switch a flowing direction of the liquid in the flow passage between a first direction to flow from the first tank to the second tank and a second direction to flow from the second tank to the first tank;
• a first pressure adjustment passage and a second pressure adjustment passage each configured to adjust a pressure in the first tank and the second tank;
• a communication passage configured to establish communication between the first pressure adjustment passage and the second pressure adjustment passage;
• and
• a passive valve provided in the communication passage, and configured to open and close the communication passage depending on a difference between the pressure in a downstream side flow passage portion located on an upstream side of the pressure chamber in the flowing direction of the liquid and a pressure in an upstream side flow passage portion located on an upstream side of the pressure chamber in the flowing direction of the liquid.