Rotary refrigerant valve for automotive heat pump control

A rotary valve comprising:

• a valve body having a cylindrical cavity;
• first, second, third, and fourth ports, each of the first, second, third, and fourth ports extending through the valve body between a surface of the cylindrical cavity and an outside of the valve body;
• and
• a rotor having a cylindrical surface that abuts the surface of the cylindrical cavity, the rotor including:
• first means for conducting flow in a first mode of operation, wherein in the first mode of operation the first port is connected only to the second port, and the flow does not reach the third and fourth ports;
• second means for conducting flow in a second mode of operation, wherein in the second mode of operation the first port is connected only to the second and third ports, and the flow does not reach the fourth port;
• third means for conducting flow in a third mode of operation, wherein in the third mode of operation the first port is connected only to the third port, and the flow does not reach the second and fourth ports;
• and
• fourth means for conducting flow in a fourth mode of operation, wherein in the fourth mode of operation the first port is connected only to the third port, and the second port is connected only to the fourth port.