Abstract: A valve arrangement is provided which comprises a valve body and a flexible curtain member. The valve body defines at least one fluid flow conduit, and a transverse curtain member track. The flexible curtain member is slidable positioned within the curtain member track, with ends projecting outwardly therefrom. Opposite ends of the curtain member are anchored securely in position, to define a curtain member orientation having opposite roll-cups defined thereby, projecting outwardly from the curtain member track. As a result of the roll-cups, the curtain member can slide between first and second extreme positions, to operate the valve arrangement.

Abstract: A cargo handling device is provided. In a preferred embodiment, the device comprises a substrate having at least one motivation mechanism mounted thereon. In other embodiments, the substrate may include more than one motivation mechanism. The motivation mechanism comprises a plurality of pairs of oppositely directed foot members; each pair of foot members comprising a first hinged member and a second hinged member. The first hinged member of each pair is selectively actuatable independently of the second member of each pair of foot members. Each hinged member generally comprises a hinge-shaped member having one hinged side mounted to the substrate and the other hinged side movable with respect thereto. For the preferred embodiment movement is generated by means of fluid bladder positioned between the two hinge member sides. When operated according to a preferred sequence, the device may be utilized in a first mode to move a substrate across a surface, such as a warehouse floor or a truck bed.