| 摘要 |
A method of regulating pressure in an ink tank including biasing an aperture of the ink tank to a closed position, withdrawing ink from an outlet port of the ink tank to provide a reduced internal pressure in the ink tank. The aperture is opened in response to the reduced internal pressure in the ink tank. The aperture leads to ambient atmospheric pressure outside the ink tank. The biasing step can include using biasing a valve member with a predetermined force against a valve seat at a contact region between the valve member and the valve seat. Opening of the aperture can include moving the member away from the valve seat in response to a difference in pressure between ambient atmospheric pressure and the reduced internal pressure in the tank.
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