CPC B41J 2/17596 (2013.01) | 16 Claims |
1. An inkjet pen comprising:
a plurality of fluid ports,
a first fluid port to deliver printing fluid to a fluid ejection device and a second fluid port to direct printing fluid out of the pen;
a pressure regulator in fluid communication with the first fluid port of the plurality of fluid ports; and
a valve in fluid communication with the second fluid port of the plurality of fluid ports;
in response to negative pressure, the valve to open to enable fluids within the pen to exit via the second fluid port.
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