Oil pump control valve

A valve device for controlling an oil pump, the device comprising:

• a valve unit including:
• a hollow holder, wherein the holder has a discharge port defined in a top portion thereof, a control port defined in a middle portion thereof, and a supply port defined in a lower portion thereof, wherein an inner diameter of the middle portion of the holder in which the control port is defined is larger than an inner diameter of the lower portion of the holder in which the supply port is defined;
• and
• a spool having ring-shaped first and second lands, wherein the first and second lands are vertically spaced from each other and contact an inner face of the holder;
• and
• a solenoid unit configured for controlling a movement of the spool;
• wherein the spool includes:
• a rod-shaped spool body;
• the ring-shaped first land disposed on a top portion of the spool body, wherein the first land has an open top;
• the ring-shaped second land disposed on a middle portion of the spool body, wherein an outer diameter of the first land is larger than an outer diameter of the second land;
• a ring-shaped third land disposed on a lower portion of the spool body, wherein an outer diameter of the third land is equal to the outer diameter of the second land;
• and
• a venting communication structure that includes:
• a vent hole defined in the spool body and disposed between the second land and the third land;
• a spool fluid channel defined in the spool body to communicate the vent hole and the open top of the first land with each other;
• and
• a spool notch defined in a lateral portion of the third land to communicate the vent hole with an inside of the spool body.