Valve mechanism, cell cultivation apparatus using same, and cell cultivation method

A valve mechanism for opening and closing a plurality of passages for liquid or gas, comprising:

• a cam body having a regular polygon shape and extending in an axial direction;
• a rotary shaft inserted through a main axis of the cam body;
• a plurality of cam contact portions disposed on a surface of the cam body and spaced apart by a predetermined angle around the surface of the cam body and extending away from the surface of the cam body;
• a motor connected to one end of the rotary shaft configured to rotate the rotary shaft thereby rotating the cam body;
• a support member supporting the motor disposed below the motor;
• and
• a plurality of clip members that engage with the plurality of passages, respectively, each clip member having a contact portion disposed at a distal end of the clip member, configured to contact a corresponding cam contact portion,
• wherein upon rotation of the cam body each cam contact portion contacts a corresponding clip member at different times to open the respective passage, and upon contact, the cam contact portions respectively contact the contact portions disposed at the distal end of the clip members,
• wherein the cam body is disposed on a frame having a hinge permitting the cam body to pivot away from the plurality of passages, and
• wherein the hinge is connected to the support member that supports the motor.