Patent ID: 8480056

Claim:
An electromagnetic valve comprising: a seat including a valve seat and a first flow path formed on the upstream side of the valve seat in terms of fluid flow; a valve body opening or closing the area between the first flow path on the upstream side of the valve seat in terms of fluid flow and a second flow path on the downstream side of the valve seat in terms of fluid flow; a coil forming a magnetic field when energized; a plunger moved in a direction in which the valve body is brought into contact with the valve seat or in a direction in which the valve body is brought away from the valve seat by energization of the coil; and a shaft including the valve body and moved in conjunction with the movement of the plunger, the distance between the valve body and the valve seat being controlled by adjustment of the amount of energization of the coil and a pressure differential between the fluid pressure in the first flow path and the fluid pressure in the second flow path being controlled, wherein the valve body has a seat portion thereof brought into contact with the valve seat configured as a spherical surface and includes a conical portion between the seat portion and the tip thereof, the conical portion being disposed on the upstream side of the seat portion in terms of fluid flow, and wherein the generatrices of the conical portion and the tangent lines to the spherical surface are matched with each other.