WATER PUMP
FIG4 is a cross-sectional view illustrating a state in which a check valve of a water pump according to an embodiment of the present disclosure is opened 
Referring to FIG4, when the cooling water flowing through the cooling water flow hole 1141a applies the pressure to the bottom of the sealing ball 1153, the sealing ball 1153 is separated from the latching protrusion 1152 and thus the flow path 1151a may be opened. Accordingly, the cooling water introduced to the flow path 1151a through the bottom of the sealing ball 1153 may be filled in the hydraulic space 1200a.
cross-sectional view
1150
check valve
1153
sealing ball
1151
valve cylinder
['7. The water pump of claim 5, wherein the body portion further comprises a check valve accommodated inside the housing to face a cooling water flow hole of which one end is connected to the cylinder portion and the other end is provided at the impeller cover, and preventing the cooling water from being introduced from the cylinder portion to the body portion by being closed when the piston moves in a direction towards the body portion.', '8. The water pump of claim 7, wherein the check valve comprises: a valve cylinder having therein a flow path communicating the body portion and the cylinder portion; a latching protrusion protruding from an inner surface of the valve cylinder; and a sealing ball located on the flow path and closing the flow path by being caught at the latching protrusion by the cooling water flowing from the cylinder portion to the body portion.']