Furthermore, the possible deformation of a sealing element under pressure, time, and temperature is important. The oil film thickness at outstroke and return stroke are responsible for the lubrication of the contact zone and the leakage rate. The oil film thickness of hydraulic seals depend on the viscosity of the oil η, the rod speedv, and the contact pressure distribution in the contact zone a, Figure 1.In order to prevent leakage on a standard seal, the oil film of the outstroke should be thinner than the film of the return stroke. The disadvantage then, is that the lubrication condition of the contact zone is poor. The idea is to develop a seal that creates a thicker oil film during outstroke that affects a limited pressure between primary and secondary seal and to use a primary seal with an integrated check valve that defines and limits the created pressure between the two seals.