| 摘要 |
PURPOSE: To prevent deformation of function of an injection valve by constituting a solenoid metering valve that contains a ball obturator movable in a cavity of the body defined by two annular valve seats placed in a raw along the shaft of the injection valve. CONSTITUTION: While a voltage is applied on a solenoid valve 12, an axial push rod 13 moves downward to the axial direction, and a ball obturator 8 moves away from the upper valve seat to closes the lower valve seat. Therefore, the communication between a control chamber 7 and a discharge hole 9 is established, and the communication of the cavity 7 and an inlet hole 10 is stopped meanwhile. As the pressure in the control chamber 7 is suddenly reduced, needle 4 may be raised, therefore, the injection nozzle can quickly be opened.
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