Abstract: A fluid power operate gripper has a housing, in which a drive space is located, which contains at least two drive pistons connected or able to be connected with a respective gripping element. The drive pistons divide up the drive space into a plurality of actuating chambers, which are subject to an actuating fluid under the control of control means in a controlled mutually matching manner. Since the drive pistons are not mechanically coupled kinematically variable operation is made possible in this manner.

Abstract: A vacuum producing device having an ejector means with a jet nozzle and a receiving nozzle downstream from it. At the outlet end of the receiving nozzle there is a receiving space for the fluid flowing through the receiving nozzle and an exit flow duct extends from it. The exit flow duct is provided with choke means for resetting or variably setting the fluid volumetric flow, leaving by way of the exit flow duct, in order to be able to affect the pressure obtaining in the receiving space.

Abstract: A valve means which comprises a control chamber in a valve housing and into which several fluid duct open. In the control chamber there is at least one pivoting control rocker member serving for the control of at least one of the fluid duct openings and able to be moved between two terminal positions, one pivotal position of such control rocker member being influenced by an electrically activated flexible element. The flexible element may act within the control chamber on an actuating part of the control rocker member. The latter is biased by spring means into a first terminal position, the flexible element engaging the actuating portion of the control rocker member in the electrically non-excited state mechanically free of stress and without any spring bias.