Valve assembly and a heat pump system including the same

A heat pump system comprising:

• a valve housing including:
• an inlet port, a first outlet port, a second outlet port, and a third outlet port, wherein the first outlet port, the second outlet port and the third outlet port are formed along a circumferential direction of the valve housing;
• a valve body rotatably accommodated inside the valve housing and including:
• a body inlet connected to the inlet port at all times,
• a body outlet selectively connected to at least one of the first outlet port, the second outlet port or the third outlet port, and
• a first expansion groove and a second expansion groove formed adjacent to the body outlet;
• a refrigerant inflow line fluidly connected to the inlet port of the valve housing;
• and
• a plurality of refrigerant discharge lines individually fluidly connected to at least one of the first outlet port, the second outlet port or the third outlet port of the valve housing, wherein the plurality of refrigerant discharge lines include a first refrigerant discharge line, a second refrigerant discharge line and a third refrigerant discharge line,
• wherein the body inlet and the inlet port are fluidly connected to the refrigerant inflow line at all times, and
• wherein the body outlet is selectively and fluidly connected to at least one of the first outlet port and the first refrigerant discharge line, the second outlet port and the second refrigerant discharge line, or the third outlet port and the third refrigerant discharge line.