A centrifugal separator

A centrifugal separator for separating at least one liquid phase from a liquid feed mixture, comprising

• a stationary frame, a drive member and a rotating part,
• wherein the drive member is configured to rotate the rotatable part in relation to the stationary frame around an axis of rotation,
• wherein the rotatable part comprises a centrifuge bowl enclosing a separation space,
• wherein the centrifuge bowl further comprises an inlet for receiving the liquid feed mixture and at least one liquid outlet, for discharging a separated liquid phase,
• wherein the centrifugal separator further comprises a mechanical seal for sealing between the rotatable part and the stationary frame during operation, the mechanical seal, comprising
• a rotatable sealing ring connected to the rotatable par;
• and
• a stationary sealing ring connected to the stationary frame;
• wherein the mechanical seal, provides a seal between an inner zone and an outer zone and wherein the inner zone is located radially inside and extends axially through the sealing rings and the outer zone is arranged radially outside the sealing rings,
• wherein the rotatable sealing ring comprises at least one first sealing surface and the stationary sealing comprises at least one second sealing surface, which sealing surfaces having a contact force between each other and forming at least one sealing interface between the rotatable and the stationary sealing rings during operation, and
• wherein the mechanical seal is arranged in the separator such that said contact force of the mechanical seal is actively dynamically adjustable in a substantially axial direction during operation.