Patent ID: 7017601

Claim:
An electromagnetic valve, comprising: a valve seat assembly including a high pressure port opened in a controlled pressure region of a high pressure, a low pressure port opened in a drainage region of a low pressure, a fluid passage formed between said high pressure port and said low pressure port and a valve seat formed in said fluid passage; a plunger assembly including a plunger disposed to be slideable reciprocatively within a column-like hollow plunger chamber and a valve element provided at one end portion of said plunger so as to open and close said fluid passage in cooperation with said valve seat; a coil housed within a case for driving said plunger upon electrical energization of said coil to thereby displace said plunger assembly to a valve-closed position at which said fluid passage is closed by said valve element while upon electrical deenergization of said coil, said plunger assembly is displaced to a valve-opened position at which said fluid passage is opened by said valve element under the influence of hydraulic pressure prevailing in said controlled pressure region; a coil cooling fluid sump space provided between an outer peripheral portion of said coil and said case; and a coil cooling fluid passage provided so as to communicate said coil cooling fluid sump space with said controlled pressure region for allowing a fluid to flow into said coil cooling fluid sump space from said controlled pressure region, said coil cooling fluid passage including a small-diameter communicating passage portion provided so as not to exert influence to the hydraulic pressure prevailing in said controlled pressure region.