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Rotary couplings

Rotary couplings and rotary valve couplings

rotary couplings: 1 to 6 passages

rotary valve couplings: loading and unloading in one or two stations

nominal diameter: ND5
ports: G 1/4
max. operating pressure: 250 / 500 bar

Series Data sheet Technical data
F9.280-1
F9.280-1
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F9.280 Rotary couplings, single passage

 

single, twin, four and six passages

without/with leakage oil port

max. operating pressure 250/500 bar

Single passage angle joints and axial joints
admissible continuous number of rotations 10 min-1
starting torque approx. 1.2 Nm
ports: G1/4 and pipe Ø 8 mm
tightening torque: 55 Nm
range of operating pressure: 10 .. 500 bar

F9.280-2
F9.280-2
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F9.280 Rotary couplings, twin passages

 

single, twin, four and six passages

without/with leakage oil port

max. operating pressure 250/500 bar

Version: rotary coupling, twin passages
nominal diameter: ND5
admissible continuous number of rotations: up to 85 min-1
leakage rate: 40 cm3/100h
ports: G 1/4
range of operating pressure: 10 .. 500 bar

F9.281-2
F9.281-2
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F9.281 Rotary couplings supported by ball bearings, twin passages

 

twin, four and six passages

ND 5

max. operating pressure 500 bar

Version: rotary coupling, twin passages
nominal diameter: ND5
admissible continuous number of rotations: up to 125 min-1
number of rotations short-time operation: 500 min-1
leakage rate: 25 cm3/100h
ports: G 1/4
max. operating pressure: 500 bar

F9.280-4
F9.280-4
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F9.280 Rotary couplings, four passages

 

single, twin, four and six passages

without/with leakage oil port

max. operating pressure 250/500 bar

Version: rotary coupling, four passages
nominal diameter: ND5
admissible continuous number of rotations: up to 50 min-1
leakage rate: 60 cm3/100h
ports: G 1/4
range of operating pressure: 10 .. 500 bar

F9.281-4
F9.281-4
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F9.281 Rotary couplings supported by ball bearings, four passages

 

twin, four and six passages

ND 5

max. operating pressure 500 bar

Version: rotary coupling, four passages
nominal diameter: ND5
admissible continuous number of rotations: up to 50 min-1
number of rotations short-time operation: 200 min-1
leakage rate: 30 cm3/100h
ports: G 1/4
max. operating pressure: 500 bar

F9.280-6
F9.280-6
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F9.280 Rotary couplings, six passages

 

single, twin, four and six passages

without/with leakage oil port

max. operating pressure 250/500 bar

Version: rotary coupling, six passages
nominal diameter: ND5
admissible continuous number of rotations: up to 35 min-1
ports: G 1/4
range of operating pressure: 10 .. 500 bar

F9.281-6
F9.281-6
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F9.281 Rotary couplings supported by ball bearings, six passages

 

twin, four and six passages

ND 5

max. operating pressure 500 bar

Version: rotary coupling, six passages
nominal diameter: ND5
admissible continuous number of rotations: up to 32 min-1
number of rotations short-time operation: 125 min-1
leakage rate: 30 cm3/100h
Connections: G 1/4
max. operating pressure: 500 bar

F9.290
F9.290
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F 9.290 Rotary valve couplings

 

nominal diameter 5

max. operating pressure 500 bar

number of stations: 5 .. 10
nominal diameter: ND5
ports: G 1/4

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figure 1: cross-section of a rotary coupling with 4 passages (supported by ball bearings) F9.281









 
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figure 2: pipe thread connection - fixing at the housing
 
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figure 3: pipe thread connection - fixation at the flange of the rotary piston
 
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figure 4: connection through drilled channels
 
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figure 5: hydraulic and pneumatic passages
 
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figure 6: additional passage when using air and oil
 
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figure 7: loading and unloading in one station
 
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figure 8: loading and unloading in two stations - commonly controlled
 
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figure 9: loading and unloading in two stations - separately controlled
 

Rotary couplings F 9.280 and F 9.281 (supported by ball bearings) (figure 1)

Application
Rotary couplings transfer liquid or gaseous media from a stationary to a rotating or swivelling machine part.
The most important fields of application are:
• Swivelling fixtures which cannot be connected by hoses.
• Rotating fixtures that rotate with a determined number of rotations.
• Rotary indexing tables that move in one direction of rotation more than 360 degree.
• Machine tables with swivel movements in both directions.

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.

Important notes (figure 2-4)
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.

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 data sheets 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 characteristics).

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.

 

 

Hydraulics and pneumatics (figure 5-6)
Mixed use of the individual passages is possible, e.g. air – oil – oil - air:
see figure 5

Please note the following:
1. The leakage of high-pressure seals can enter into the adjacent air passage.
2. If the hydraulic pressure is lower than the air pressure, air diffuses into the adjacent hydraulic passage and this can lead to malfunctions (air in oil).
Therefore, we recommend to separate the different media by means of an intermediate leakage passage: see figure 6

 

 

 

Rotary valve couplings F9.290 (figure 7-9)

Description
Rotary valve couplings are used if several fixtures have to be supplied on rotary indexing systems. Provided that clamping and unclamping will be made always in the same place and the fixtures are arranged in a uniform way on the rotating plate.
Clamping and unclamping is made by 1off or in the case of double-acting cylinders by 2 off 3/2 directional control valves, which are arranged outside the rotating system. Since in the unclamped position there is a continuous leakage to the return line, we recommend to use an accumulator for applications with operating pressures of up to 200 bar, for applications with operating pressures exceeding 200 bar an accumulator is required.

Important notes
Rotary valve couplings must only be operated with hydraulic oil. The rotary coupling has to be connected to the power unit on all levels to ensure sufficient lubrications of the seals.

Versions

  • Loading and unloading in one station (figure 7)
  • Loading and unloading in two stations - commonly controlled (figure 8)
  • Loading and unloading in two stations - separately controlled (figure 9)
 
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figure 1: rotary valve coupling F9.290 at an indexing machine with 12 stations
 
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figure 2: rotary valve coupling F9.290 at an indexing machine with 12 stations
 
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figure 3: trunnion bearing with hydraulic locking
 
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figure 4: rotary valve coupling in combination with an automatic coupling system
 

Rotary valve couplings F9.290 (figure 1)
at an indexing machine with 12 stations

 

 

 



Rotary valve couplings F9.290 (figure 2)
with 8 stations for single-acting swing clamps
Application in a multiple-spindle machine with for stations for machining of aluminium covers. The four not required ports of the rotary valve coupling are plugged.

 

Rotary valve couplings F9.290 (figure 3)
Trunnion bearing with hydraulic locking and integrated
oil supply through rotary valve coupling

 


Rotary valve couplings F9.290 (figure 4)
Rotary valve coupling in combination with an automatic coupling system