The new Servoseal® sealing element is a dynamically sealing synthetic ring. The integrated retaining ring made of carbon prevents excessive pressure build-up on the sealing surface due to hydraulic pressure. At small amplitudes, no wear and no scoring are produced on the counterfaces due to lack of lubrication. Thus, this sealing element can be used in the sleek servo actuator series 120 and 300 just as well as in the testing actuator series 320.

With these servo actuators you can realize testing tasks with small amplitudes and frequencies up to 25 Hz, low side loads and long strokes. And all this with all the advantages mentioned: low friction, low wear and no leakage or functional oil as with the gap seals.

But in many cases, it is also possible to equip the customary hydrostatic testing actuators of the 320 series for highly dynamic movements and high side loads with the Servoseal® and thus achieve better hydraulic efficiency. Additionally, often a smaller control valve may be used, since no functional oil flow is used and there is no leakage of the gap seal with the use of the Servoseal®.