High pressure pump

A high pressure pump comprising:

• a cylinder body, wherein the cylinder body has a cylinder and a communication hole communicated with the cylinder;
• a cover attached to the cylinder body to surround the communication hole, wherein the cover has a through hole;
• a plunger that reciprocates in the cylinder;
• an electromagnetic valve having a pressurizing chamber, a housing attached to the cover, wherein the housing has a valve seat and a valve hole connected to the pressurizing chamber, and a valve body for selectively contacting to and separating from the valve seat to selectively open and close opening and closing the valve hole, wherein, when fluid is pressurized in the pressurizing chamber, the valve hole is closed by the valve body and the plunger enters the pressurizing chamber;
• a fastener located in the through hole cover, wherein the fastener fixes the electromagnetic valve to the cover;
• and a seal ring located between an outer surface of the electromagnetic valve and an inner surface of the communication hole, wherein the seal ring seals the pressurizing chamber,
• wherein the electromagnetic valve has a cylindrical portion, which is located in the communication hole, wherein the pressurizing chamber is formed in the cylindrical portion, and wherein the seal ring is located between an outer surface of the cylindrical portion and the inner surface of the communication hole.