Patent ID: 8597259

Claim:
A device for controlling the rate of flow of a liquid in a flexible tube, the device comprising: two opposed surfaces between which the tube is received in use, wherein the opposed surfaces are generally flat, are elongated in the direction of flow of the liquid in the tube, and are either parallel to one another or arranged so that in use the included angle does not exceed 40°, wherein the opposed surfaces are hinged along one long edge and each provided with a threaded aperture in a long edge opposite the hinge; and means for varying a distance between the surfaces so as to compress the tube between them by a desired amount, wherein the means comprises a double-ended grub screw provided with adjustment means in the middle of the double-ended grub screw such that the ends of the grub screw may be received in the apertures and the adjustment means may be rotated to vary the distance between the surfaces.