| 摘要 |
A mechanical seal combination includes a double mechanical seal and a barrier fluid pump system. A barrier fluid circulating pump 10 is coupled to rotatable shaft 3 so as to derive its motive power from the rotatable shaft. When the rotatable shaft is not running, a by-pass arrangement causes barrier fluids to flow between the barrier fluid header tank 7 and the seal 3, avoiding pump 10, and allowing a thermosyphon effect to be created.
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