Three-way valve for flow rate control and temperature control device

A three-way valve for flow rate control, comprising:

• a valve main body including:
• a valve seat having a columnar space and having a first valve port and a second valve port, the first valve port having a rectangular cross section and allowing inflow of a first fluid, the second valve port having a rectangular cross section and allowing inflow of a second fluid;
• and
• first and second inflow ports, which allow inflow of the first fluid and the second fluid to the first and second valve ports from an outside;
• first and second valve port forming members, which are fitted to the valve main body to form the first valve port and the second valve port, respectively;
• a valve body having a cylindrical shape and an opening, which is provided in a freely rotatable manner in the valve seat of the valve main body, and simultaneously switches the first valve port from a closed state to an opened state and switches the second valve port from an opened state to a closed state;
• a pressure applying portion configured to apply pressures of the first and second fluids leaking through a gap between the valve body and the valve seat to the first and second valve port forming members so as to suppress shift of a position of the valve body when the valve body opens and closes the first valve port and the second valve port;
• and
• drive means for driving the valve body to rotate,
• wherein the pressure applying portion includes first and second flow passage forming members each having a cylindrical shape, which are members fitted to the valve main body to form the first and second outflow ports, and in which both end portions of each of the first and second flow passage forming members in a longitudinal direction are sealed by sealing means, which has a substantially U-shaped cross section and is made of a synthetic resin, and is urged in an opening direction by a spring member made of a metal, and
• wherein a pair of the sealing means are arranged on the end portions of one of the first and second flow passage forming members, in a manner where open ends of the pair of the sealing means face the one of the first and second flow passage forming members.