Abstract: A pallet for clamping a workpiece to be processed, in particular by machining operations, wherein the pallet is connected to a holding fixture which accommodates a quick-acting connection which is provided with conduits for the feed of a hydraulic fluid to a piston/cylinder unit and with a quick-acting connection in combination with conduits for the return of the hydraulic fluid, in which case these first connections can be connected to second quick-acting connections which are connected to a conduit for the feed of the hydraulic fluid and to a conduit for the return of the hydraulic fluid to a hydraulic supply unit, and the second quick-acting connections are arranged in a holding body which has an actuating lever for a connecting device, and the actuating lever has an eccentric slot, which can be connected to a guide pin which is fastened to the holding body for the first quick-acting connections.

Abstract: A cam mechanism couples flat-faced, male and female couplers while minimizing the tendency of a pressurized fluid from exerting a force tending to resist the coupling. Internal valve assemblies within the couplers are maintained closed during the coupling. Once the coupling is complete, a control lever of the cam mechanism is actuated to open both valve assemblies to enable flow of the pressurized fluid.

Abstract: Quick-action male coupling (1) connectable under pressure and having a tubular outer body (2) containing a valve guide (7) supported so as to be central and defining flow channels (FC) for the fluid, and an inner valve (9) which is selectively pushed so as to tend to close the mouth (8) of the outer body (2), wherein a sliding tubular body (20) is present between the outer body (2) and the valve guide (7); the sliding tubular body (20) is pushed by a spring so as to tend to close the flow channels (FC); in the closed position the sliding tubular body (20) is in sealing contact with the outer body (2) and with the valve guide (7) and experiences hydrostatic pressures of equal magnitudes but opposite directions exerted by the fluid; and the sliding tubular body (20) is pushed by the inner valve (9) so as to tend to open the flow channels (FC).