Flow channel switching valve

A flow channel switching valve comprising:

• a housing that has an internal space, the housing including a housing top having a plurality of connection ports connecting flow channel piping in an outer surface thereof, and having, on a side of the internal space, a flow channel connection portion where connection holes respectively leading to the connection ports are arranged on one plane, and a housing body detachably holding the housing top;
• a stator having through-holes corresponding to the connection holes of the flow channel connection portion, respectively, and attached to a side of the housing top while keeping liquid tightness to the flow channel connection portion in a state where the through-holes are positioned at the connection holes;
• a rotor that has a plane in contact with a surface of the stator on an opposing side of the flow channel connection portion, and is provided with a groove in the plane, the groove forming a flow channel selectively connecting between any one pair of the through-holes of the stator;
• a rotor drive portion that rotates the rotor while sliding the rotor on the stator;
• and
• a stator fixing member that has a portion detachably mounted on the housing top from a side of the stator, and a portion holding the stator, and fixes the stator to the housing top,
• wherein the stator fixing member is a cylindrical member surrounding an outer circumference of the stator,
• wherein an engagement portion that is engaged with a circumferential edge portion of a surface of the stator on a side of the rotor is provided at one end of the stator fixing member as the portion holding the stator,
• wherein the portion detachably mounted on the housing top is another end of the stator fixing member, and is configured so as to be mounted on the housing top, and
• wherein an circular groove into which the other end of the stator fixing member is fitted is formed around the flow channel connection portion of the housing top.