Advantages of locking unit with pressure piston seal:
  • for particularly sensitive applications
  • low sliding friction
  • speeds of up to 2 m/s possible
  • pressure-independent sliding friction

Functional principle of hydraulic rod clamps with pressure piston seal

The functional principle of hyddraulic clamping device Ratio-Clamp®  is based on the principle of frictional contact: In the pressureless initial position the force stored in the springs is diverted over the cone and clamps down on a round rod. The applied hydraulic releasing pressure moves the locking piston against the spring force to unlock the clamp.

Clamping device Ratio-Clamp® with pressure piston seal
A pressure piston seal that doesn't touch the rod replaces the pressurised sealing elements on clamping sleeve and locking piston. Thus, the very low sliding friction is not influenced by the releasing pressure and will remain constant.

Clamping device Ratio-Clamp® with pressure piston seal

Technical data of locking unit with pressure piston seal

Since clamping geometry and spring are identical to those of the standard Ratio-Clamp®, the same clamping forces can be realised. Due to the smaller hydraulic working area, however, the minimum admissible releasing pressure increases. The max. releasing pressure remains at 160 bar.

 

  • for all round rods with hard surfaces
  • load capacity independent of direction
  • after 2 million switching cycles the Ratio-Clamp® shall be inspected at the factory
  • max. rod speed: 1 m/s with Servocop®, 2 m/s with pressure piston seal
  • max. releasing pressure: 160 bar
  • working temperatures: -30°C bis +80°C
  • fluids: mineral oils, others like water, HFC or Skydrol® on request
Technical data
Clamping unit
Here you can find all technical data for our clamping unit Ratio-Clamp® on an overview sheet
    RATIO-CLAMP®

RATIO-CLAMP®
PRESSURE PISTON SEAL
 
  + Releasing pressure
+ Locking
+ Sealing system
+ Certification
Basic design
With spring power
Servocop®
TÜV
Basic design
With spring power
Pressure piston seal
TÜV
 
  Rod Ø
(mm)
Max.
holding load
(kN)
Releasing pressure
min.
(bar)
Max.
holding load
(kN)
Releasing pressure
min.
(bar)
 
   16  10     60         
   18  12,5  55    12,5  75     
   20  14     55     14     75     
   22  17     70     17     90     
   25  20     70     20     90     
   28  31,5  90     31,5  120     
   30  40     105     40     135     
   32  40     60     40     90     
   36  45     75    45     100     
   40  50     80     50     100     
   45  65     70     65     90     
   50  80     90     80     110     
   56  90     75     90     100     
   60  100     75     100     100     
   63  100     85     100     110     
   70  140     80     140     110     
   80  180     90     180     110     
   90  200     65    200    85     
   100  250     75     250     95     
   110  300     65     300     90     
   120  330     70     330     90     
   125  350     75     350     90     
   140  450     65         
   160  750     90         

Other holding forces and rod Ø on request.
Hydraulic locking is possible up to 2,000 kN holding load and 300 mm rod Ø.
The stated values apply to operation with mineral oil. The holding load may differ when using other fluids.

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