FIELD: the invention refers to machine-building and testing equipment and may be used particularly for providing work of the tubes under pressure, and also at hydraulic tests of tubes for insulation.
SUBSTANCE: each hydraulic fastener has movably placed in a detachable cartridge mechanical primarily collets' elements of pressing of the tube or a socket liable to joining and interacting with them a hydraulic element in the shape of a ring piston. The piston has a self-packing cuff, percepts and transmits pressure of working liquid directly or through at least one intermediate element on the faces of collet elements and an adjoining to the cuff a ring section of the wall of the tube or the socket liable to joining.
EFFECT: increases reliability and longevity of the work of the clamping arrangement.
17 cl, 3 dwg
