Rotary couplings transfer hydraulic oil from a fixed to a rotating machine part. The assembly is done in the rotation axis of the subassembly. Depending on the number of junction levels several single-acting or double-acting hydraulic elements can be connected.
Rotary couplings transmit hydraulic ﬂuid to revolving tables. The structure is designed as a rotary slide valve, which permits several hydraulic devices to be supplied simultaneously with hydraulic ﬂuid under pressure, and independently of that, a loading and unloading station to clamped or unclamped by means of distributing valves.