If pressure is applied to the swing clamp at port A, a specially grooved swing ring first moves down, causing the piston to rotate. During this rotary movement, the piston is mechanically blocked in the axial direction by steel balls. As soon as the swivel ring has reached its end position and the swivel movement of the piston has ended, the lock is released – the piston can now perform its clamping stroke downwards. When relaxing, the functionality is exactly the opposite. The piston first moves upwards in the axial direction and then swivels back into its starting position.