Sealing system between two components which are translationally movable relative to one another along a movement axis , which system is intended for sealing off a high-pressure side (H) from a low-pressure side (N), an outer component having a first annular groove which is open to an inner component and faces the low-pressure side (N), and two second annular grooves which are open to the inner component and face the high-pressure side (H), a sealing arrangement being provided in the first annular groove , which arrangement has a first sealing ring which abuts the inner component and is made of an elastically deformable material, and a first pretensioning ring which radially pretensions the first sealing ring , seals off said ring from the first annular groove and is made of an elastically deformable material, a pressure relief element being provided in each second annular groove , which element has a second sealing ring which abuts the inner component and is made of an elastically deformable material, and a second pretensioning ring which radially pretensions the second sealing ring , seals off said ring from the second annular groove and is made of an elastically deformable material, the second sealing ring having a sealing edge which has a contact surface angle (α a , α b ) on the high-pressure side and a contact surface angle (β a , β b ) on the low-pressure side, at least one connecting channel being assigned to each pressure relief element , via which channel a gap (Z a ) between the sealing arrangement and the first pressure relief element can be connected to the high-pressure side (H) or a gap (Z b ) between two adjacent pressure relief elements can be connected to the high-pressure side (H) or two adjacent gaps (Z a , Z b ) can be connected to one another via the connecting channel , each connecting channel being closed in a pressure condition P ZN > P H or P ZN > P ZH and open in a pressure relief condition P ZN ≥ P H + P krit or P ZN ≥ P ZH +P krit , where P H is the hydraulic pressure on the high-pressure side (H), P ZN is the hydraulic pressure in the low-pressure side gap, P ZH is the hydraulic pressure in the high-pressure side gap and P krit is a pressure increase value at which or in excess of which the connecting channel is opened, P krit being defined by a deformation of the second pretensioning ring , the connecting channel in the pressure condition P ZN > P H or P ZN > P ZH being closed by the second pretensioning ring , and the high-pressure side contact surface angle (α a , α b ) of the sealing edge of the second sealing ring being less than or equal to the low-pressure side contact surface angle (β a , β b ) of the sealing edge such that, in the pressurized state and during a back and forth movement of the inner component in the outer component , a specific leakage rate is set for the second sealing ring , by means of which rate the hydraulic pressure in the low-pressure side gap (Z a , Z b ) is set, characterized in that the second sealing ring and the second pretensioning ring of the two pressure relief elements are each integrally formed with one another and consist of polyurethane, P krit being defined in a direction radial to the movement axis by an at least partial deformation of the second pretensioning ring , and the sealing edge of the sealing ring of each pressure relief element being rounded, and the second sealing ring of the two pressure relief elements being provided in each case with a support ring, and the support ring of at least one pressure relief element having a radius only on the inner face thereof which faces the inner component . <EOS>