Valve apparatus and integrated thermal management system using same

A valve apparatus comprising:

• a stationary housing having a cylindrical internal space, and of which a circumferential surface is divided into a first section and a second section and each of the first section and the second section has a plurality of ports;
• a stem having a cylindrical periphery and rotatably provided in the internal space of the housing,
• the stem comprising:
• a plurality of first flow paths matching with the plurality of ports of the first section,
• a plurality of second flow paths matching with the plurality of ports of the second section, and
• a communication part defined as a hole monolithically formed in a body of the stem and extending along a rotational axis of the stem, the communication part being opened to one of the plurality of ports of the first section and in communication with one of the plurality of ports of the second section such that, based on a rotational angle, a flow of coolant is selectively switched among the plurality of ports of the first section, among the plurality of ports of the second section, or between the plurality of ports of the first section and the plurality of ports of the second section;
• an actuator provided at the housing and configured to control a rotating position of the stem;
• and
• a seal interposed between the housing and the stem, and having a plurality of through holes matching with the plurality of first flow paths, the plurality of second flow paths, and the communication part of the stem.