Richtungsempfindliches Ventil für Farbstrahlaufzeichnungsgerät

摘要

The valve (20) is operable with a bubble generator (54) that provides a restricted flow of air bubbles into a reservoir (24) of an ink-jet pen (22) to relieve excessive back pressure in the pen. The valve (20) includes housed operating liquid (46) that closes the valve in the event that the pen (22) is tipped out of an upright orientation. A hydrophobic air-porous vent (52) is provided for permitting passage of air bubbles through the valve into the reservoir (24) while prohibiting the flow of the operating liquid (46) through the vent (52).