Rotary Couplings, supported by ball bearings, four passage

Description
The oil supply at the housing is made by radial pipe threads that end in circular slots of the rotary piston. From there, the hydraulic oil is led upwards through axial bore holes. The pipe connection at the rotary piston can optionally be effected radially or axially. Alternatively, a manifold-mounting type with O-ring seals is available.
The starting torque is reduced by the following measures:

• The rotary piston is supported by ball bearings.
• The running surfaces for the seals are nitrated, ground and polished.
• The special seals have low friction and are abrasion resistant.

A radial shaft seal protects the interior against dirt and coolants. 
At the leakage port the little leakage can be led away in a controlled manner.

Hydraulic applications
As hydraulic medium HLP as per DIN 51524-2 is prescribed. For the use of other media please contact us.
The diagrams on the following pages show the starting torque and the admissible continuous number of rotations as a function of the operating pressure. If the rotary coupling is operated at the limit of performance (pressure + number of rotations), pay attention to sufficient supply of cooling air (see Technical data).

Use of pneumatics
A prerequisite for pneumatic use is oiled compressed air free from water. Thus, numbers of rotations up to 10 rpm are possible. A continuous operation with constant high number of rotations is not admissible, because the seals will become too hot for lack of lubrication.

Important notes
Fixing is made precisely in axial direction at the housing or at the flange of the rotary piston. The firmly-screwed component can be connected with pipes. To compensate the torque, the other part is connected to an anti-rotation key that offers sufficient freedom of motion and avoids forced conditions as well as axial forces. That is the reason why also here high-pressure hoses have to be used instead of pipes. The leakage port at the housing must not be closed to avoid malfunctions. 

Installation and connecting possibilities
Pipe thread, Manifold-mounting connection

Advantages

• Max. operating pressure 500 bar
• Min. dimensions
• Axial or radial pipe thread
• Manifould-mounting design optional
• Sturdy bearing (ball bearing)
• Low starting torque
• Protection against coolants
• Separate leakage port
• Long service life