Environmentally safe pump having a bellows seal and a split ring shaft seal

摘要

A seal arrangement for a centrifugal pump including a split ring shaft seal located inboard of both the shaft sleeve and a cartridge- loaded bellows seal so as to prevent the fluid being pumped from leaking under the sleeve and carbonizing. Because there is no carbonization under the sleeve, the bellows seal does not become bonded to the pump shaft. Accordingly, seal disassembly is made easier. A plurality of elongated push rods are disposed along the shaft between the split ring seal and a pushing assembly. The pushing assembly forces the push rods toward the split ring seal so as to tighten it down into fluid sealing contact with the outer periphery of the shaft.