South Portuguese zone: structural outline

A mechanical seal construction comprising a pair of seal elements having mutually contacting sealing faces, one seal element being fixed with respect to a wall and the other seal element being capable of rotation in response to rotation of a shaft. A further element is nonrotatably connected to the shaft and is sealingly interconnected to said other seal element by a flexible bellows-type seal. Said further element comprises an axially split two-part collar surrounding and fixedly connected to the shaft and having a suitable packing associated therewith for sealingly engaging the shaft. The packing, in a preferred embodiment, comprises an annular ringlike sealing member constructed of multilayer graphite material compressed axially between the two-part collar. The collar has wedge means thereon for causing the sealing member to be radially compressed against the shaft to sealingly engage same.