Actuation and Valve Mechanism

A fluid control barrier adapted to be fitted inside a pipe through which a fluid flows, a bi-foldable barrier member is provided to control fluid flow through said pipe, said bi-foldable barrier member having a pair of plates with a hinge along their straight edges to allow for opening and closing of said fluid control barrier, said hinge pinned to said pipe and a pair of lifting means attached to each of said plates to allow said bi-foldable barrier member to be opened and closed.

A fluid control barrier adapted to be fitted to an end of a pipe or inside said pipe through which fluid is contained or inside a pipe through which fluid flows, a bi-foldable barrier member controls movement of said fluid, said bi-foldable barrier member having a pair of plates with a hinge along their straight edges to allow for opening and closing of said fluid control barrier, at least one pair of struts pivotally mounted to said plates at one end and pivotally attached to a fixed position shaft or cross member at the other end thereof, said struts mounted to said plates along or near to the centroidal axes of said plates to minimize the force required to open or close said bi-foldable barrier member.

A cable drive device including a linear drive member, a cable drum attached to a support bracket adapted to be affixed to a surface, said cable drum having an axle supported by said support bracket to allow rotation of said cable drum, said cable drum having a cable affixed at either end of said linear drive member and tautly wrapped around said cable drum, said cable drum located between said ends of said linear drive member to, in use, allow said linear drive member to be guided through said bracket to move said linear drive member longitudinally when said axle is rotated.

A cable drive device including an arcuate segment drive member, a cable drum having an axle to allow rotation of said cable drum, said cable drum having a cable affixed at either end of an arcuate section of said arcuate segment drive member and tautly wrapped around said cable drum, said cable drum located between said ends of said arcuate section of said arcuate segment drive member to, in use, allow said arcuate segment drive member to be moved when said axle is rotated.