Multi-way coolant valve and heat pump system having the same

A multi-way coolant valve apparatus comprising:

• an external housing in which a first external inlet, a second external inlet, a third external inlet, a first external outlet, a second external outlet, and a third external outlet are formed;
• and
• an internal housing provided rotatably inside the external housing to selectively fluidically-connect the first, second and third external inlets, and the first, second and third external outlets, and divided into two stages through which a coolant flows respectively,
• wherein as the internal housing rotates at a predetermined interval in a selected mode of the vehicle, the first external inlet selectively fluidically-communicates with the first external outlet, the second external outlet, or the third external outlet,
• the second external inlet selectively fluidically-communicates with the first external outlet or the second external outlet, and
• the third external inlet selectively fluidically-communicates with the first external outlet,
• the second external outlet, or the third external outlet,
• wherein the internal housing further includes:
• a hollow internal body member of which upper and lower surfaces are opened;
• and
• a first partition wall partitioning the internal body member into a first internal body member and a second internal body member in a height direction of the internal body member.