Patent ID: 8322374

Claim:
A channel switching valve comprising: a body section; a stator to which a plurality of flow channels are to be connected and which has a surface having distribution ports to be connected to the flow channels respectively and is attached to the body section so that the surface faces inward; a rotor which is placed in the body section, has a contact surface being in contact with the surface of the stator and having at least one groove for interconnecting two of the distribution ports of the stator, and is attached to a distal end of a shaft penetrating the body section so as to be rotated by rotation of the shaft to change a combination of the distribution ports that should be interconnected by the groove; an elastic member held in the body section in its compressed state to urge the rotor toward the stator; and an adjusting system which adjusts an urging force for pressing the rotor against the stator by changing a stroke of the elastic member, wherein the adjusting system includes protruding/recessed patterns, the protruding/recessed patterns being designed to be fitted into each other, wherein the stroke is changed between a first position in a state where the protruding/recessed patterns are fitted into each other and a second position in a state where the protruding/recessed patterns are not fitted into each other, wherein the stator and the body section each have a connecting surface, and are removably fixed to each other by a fixing member at their connecting surfaces, wherein one of the protruding/recessed patterns is formed on the connecting surface of the stator and the other of the protruding/recessed patterns is formed on the connecting surface of the body section, and wherein by rotating the stator and the body section relative to each other, the stroke is changed between the first and second positions.