Abstract: The invention relates to a coupling device for simultaneously coupling and decoupling a number of coupling pairs, which coupling device includes:—a number of coupling pairs, each having a first coupling part and a second coupling part; —a first mounting frame on which the first coupling parts of the number of coupling pairs are arranged; —a second mounting frame arranged parallel to the first mounting frame, wherein the second coupling parts of the number of coupling pairs are arranged to the second mounting frame, and wherein the second mounting frame is movable towards to and away from the first mounting frame between a connected position, in which each first coupling part is connected with the corresponding second coupling part, and a disconnected position; —guiding mechanism arranged to the first mounting frame and the second mounting frame for guiding the movement between the connected and disconnected position; —at least one rack and pinion drive arranged between the first and second mounting frame, whe

Abstract: A system for varying the deadweight of apparatus incorporates a fluid coupling (10) and fluid flow control valve. The fluid coupling comprises first and second connectors (20, 30) each configured for attachment (at respective ends 21 and 31) to respective fluid conduits (not shown), for example hydraulic hoses. Each connector (20,30) has a cylindrical body (3,3) configured to rotate about the longitudinal axis A having a bore or lumen (22,32) for fluid flow therethrough in a predetermined orientation as indicated by arrows D. Registration of the respective lumens (22,32) at ends (23,33) of the connectors permits fluid to flow between the connectors (20,30) at maximum rate when lumens (22,32) are aligned with apertures (24?,34)? , fluid to be stopped when lumens butt against shutters (24,34), and fluid to flow at intermediate rate when lumens are registered in intermediate positions.