A ball sealing device for sealing against a ball surface of a ball, a tank mixer having such a ball sealing device, and a method of servicing a ball sealing device for sealing against a ball surface of a ball

摘要

A ball sealing device for sealing against a ball surface of a ball (50), having an operating seal (31) for sealing against the ball surface in a first position (normal operation) of the ball sealing device, a service seal (32) for sealing against the ball surface in a second position (service or sealing) Maintenance operation) of the ball sealing apparatus, andwherein the ball sealing apparatus further comprises a main body (10) on which the service seal (32) is disposed and to which the operating seal (31) is detachably disposed, adjustment means (41, 42) for moving the ball seal assembly between the first and second positions, wherein the service seal (31) is bias reduced in the second position such that the service seal (31) is interchangeable in the second position, wherein the service seal (32) is not in contact with the ball surface in the first position.