Patent ID: 8286933

Claim:
A valve, comprising a valve body and a tube made of an elastomer extending through the inside of said valve body, said tube providing a flow passage having a flow passage axis, and for closing off the flow of fluid in said tube, said valve characterized by further comprising squeezing means disposed facing each other across said tube, and a rotating member supported by said valve body so as to be rotatable about an axis of rotation, said squeezing means comprising a roller rotatably supported by said rotating member so that said roller orbits about the axis of rotation of said rotating member along with rotation of said rotating member, and an arc-shaped pressing surface formed on said valve body and extending to be centered around said axis of rotation of said rotating member, part of said tube arranged along said pressing surface, wherein rotation of said rotating member makes said roller move to a position facing said pressing surface to collapse said tube and close the flow passage inside said tube and then makes said roller move parallel to said pressing surface so as to move a collapsed position where said tube is collapsed by said roller while maintaining said flow passage in the closed state, wherein a cylinder chamber accommodating a piston is formed in said valve body, said piston adapted to be driven in an axial direction of said cylinder chamber by a working fluid, said piston provided with a notch extending in a direction vertical to a direction of movement of said piston; wherein said rotating member further comprises an engagement shaft part positioned at a side opposite to said roller across said axis of rotation of said rotating member and extending parallel to said axis of rotation, said engagement shaft part engaging with said notch of said piston adapted to rotate about said axis of rotation of said rotating member along with the movement of said piston so as to make said rotating member rotate about said axis of rotation.