Häko Product configurator
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.

Clamping device Ratio-Clamp® with pressure piston seal

Sealing system
Releasing pressure
Certification
Functional principle
Servocop®
Basic design
DGUV Test
Locked with spring power
Rod Ø* f7
in [mm]
F axial max.
in [kN]
p release min
in [bar]
 18 12.5 75
 20  14 75
 22 17 90
25 20 90
 28  31.5  120
 30  40  135
 32  40  90
 36  45  100
 40  50  100
 45  65  90
 50  80  110
 56  90  100
 60  100  100
 63  100  110
 70  140  110
 80  180  110
 90  200  85
 100  250  95
 110  300  90
 120  330  90
 125  350  90

* Other bores available on request

 

  • for all round rods with hard surfaces
  • load capacity independent of direction
  • after 2 m switchings, the clamping device must be checked by the manufacturer
  • max. rod speed: 2 m/s for pressure piston seal
  • max. releasing pressure: 160 bar
  • operating temperature: -30°C bis +80°C
  • fluid: mineral oils
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