Rotary couplings without/with leackage return

Rotary couplings without/with leackage return

Rotary couplings transmit hydraulic oil from a fixed to a rotating machine

part. The assembly is done in the rotating axis of the subassembly. 


Depending on the number of junction levels several single- or double-acting

hydraulic elements can be connected. On principle, the rotary coupling is

only suitable for hydraulic oil. 


If pneumatic shall be transferred, the catalogued elements can be used

providing that the air is filtered and lubricated to guarantee seal greasing

and corrosion protection. In the design stage it needs to be considered that

the rotation movement is obstructed by the seal friction. 


This frictional drag is pressure dependant and must be considered for the

drive torque of the rotary table. Corresponding information can be found in

the relating diagrams which show the starting torques existing while all

junction levels are pressurised. 


When placing an enquiry or an order, the operating circumstances should

be stated. These are for example operating pressure, medium, functionality

(single-acting od double-acting) and cycle time.