Cushman, Darby & Cushman
Three-way electromagnetic valve
 A three-way electromagnetic valve controls the opening and closing of a fuel injection valve by enabling a back pressure chamber in which fuel for serving to bias a nozzle needle of the fuel injection valve in the valve closing direction is stored to communicate alternatively with a high pressure chamber in which a high pressure fuel is stored or a low pressure chamber in which a low pressure fuel is stored, and is prevented from any accumulation of extraneous material in clearances of a sliding portion. This three-way electromagnetic valve includes a valve body having a sliding hole, and control, supply and discharge ports through which the sliding hole is enabled to communicate with the back pressure chamber, the high pressure chamber and the low pressure chamber, respectively, and a valve member slidably disposed in the sliding hole and capable of sliding on receiving an electromagnetic force of an electromagnetic actuator, the valve member serving to change over alternatively from one of a first communication state that the supply port and the control port are communicated with each other and a second communication state that the control port and the discharge port are communicated with each other to the other. The supply port is opened in the sliding wall of the sliding hole in the direction perpendicular to the sliding wall, and the clearance between the sliding hole and the valve member is so set as to be made large at the position remote from the supply port but small at the position adjacent to the supply port. 
Nippondensco Co., Ltd.
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Nobuyuki
Kato