Patent ID: 7992980

Claim:
A liquid ejecting apparatus comprising: a liquid ejecting head having a nozzle and ejecting a liquid from the nozzle; a liquid supply passage which is connected with the liquid ejecting head, and through which the liquid is supplied to the liquid ejecting head; a gas discharge passage which is connected with the liquid supply passage at two different places, and through which a gas in the liquid supply passage is discharged; a gas-permeable film which is disposed at one of the two different places and constitutes a wall which separates the liquid supply passage and the gas discharge passage from each other, the gas-permeable film allowing gases to pass therethrough but not allowing liquids to pass therethrough; a shut-off valve which is disposed at the other of the two different places, and selectively placeable in an open position to communicate the liquid supply passage and the gas discharge passage with each other and a closing position to disconnect the communication between the liquid supply passage and the gas discharge passage; and a sucking device which lowers an internal pressure of the gas discharge passage by sucking the gas from the gas discharge passage, wherein the shut-off valve is constituted by a differential pressure valve which is displaced between the closing position and the opening position by a force deriving from a difference between the internal pressure of the liquid supply passage and the internal pressure of the gas discharge passage, wherein the differential pressure valve is placed in the closing position when the internal pressure of the gas discharge passage is equal or higher than a threshold, and wherein the differential pressure valve is placed in the opening position when the internal pressure of the gas discharge passage is lower than the threshold.