| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve device which can prevent the dispersion of operating pressure due to difference in individual valve bodies, the dispersion being caused by fluctuation of a load applied to the valve body attributable to a change of a diaphragm deflecting direction, and to provide a fluid feeder, and a fluid ejection device. SOLUTION: According to the structure of a valve unit 21, a valve hole 52 is formed in a partition 51 partitioning an ink feeding chamber 56 from a pressure chamber 43. A shaft portion 57b of the valve body 57 in the ink feeding chamber 56, energized toward the pressure chamber 43 by a compressive spring 59, is inserted into the valve hole 52, and abutted on a pressure receiver 65 secured to the internal surface of the diaphragm 42a. Further the pressure receiver 65 is energized outward by a negative pressure holding spring 66 arranged in the pressure chamber 43. In the state that the pressure chamber 43 is pressurized by the operating pressure, when the valve unit is closed, i.e. when a projection 60a of a sealing member 60 covering a plate portion 57a of the valve body 57 abuts on a valve seat 61, the diaphragm 42a is recessed from a welding position toward the pressure chamber 43 in the side surface of a frame 40 of a film member 42. COPYRIGHT: (C)2008,JPO&INPIT |
