Abstract: A valve stem seal includes an elastomeric annular seal body including a first seal body section and a second seal body section. The first seal body section includes a first seal lip configured to sealingly abut against the valve stem to delimit an oil space and a second seal lip axially spaced from the first seal lip and configured to sealingly abut against the valve stem to delimit an air space. The first seal body section includes an annular channel in a radially inner wall between the first seal lip and the second seal lip that is spaced from the valve stem when the valve stem seal is mounted on the valve stem, and the surface of the channel includes an undercut configured to facilitate a deformation of the second seal lip toward the first seal lip.

Abstract: A radial shaft seal ring for sealing a space between a shaft and a bore in a housing includes a support body having an axial part, a radial part and a curved connecting part connecting the axial part to the radial part. A seal body is mounted on the support body and has a static seal element configured to seal between the support body and the bore and a dynamic seal element configured to sealingly abut against the shaft. The static seal element extends from the axial part of the support body over the connecting part to the radial part of the support body and includes an axial seal element section and a radial seal element section. A radially outer surface of the static seal element has a radially outwardly directed first seal bead, at least a portion of which is located directly radially outward of the curved connecting part.

Abstract: A valve stem seal includes an elastomeric annular seal body including a first seal body section and a second seal body section. The first seal body section includes a first seal lip configured to sealingly abut against the valve stem to delimit an oil space and a second seal lip axially spaced from the first seal lip and configured to sealingly abut against the valve stem to delimit an air space. The first seal body section includes an annular channel in a radially inner wall between the first seal lip and the second seal lip that is spaced from the valve stem when the valve stem seal is mounted on the valve stem, and the surface of the channel includes an undercut configured to facilitate a deformation of the second seal lip toward the first seal lip.