Sealing device for the drive shaft of a high pressure fluid pump
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United States of America Patent
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May 6, 1986
Grant Date -
N/A
app pub date -
May 17, 1982
filing date -
May 21, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Sealing device for the drive shaft (27) of a high pressure fluid pump comprising a system of seals (33, 34, 35) at least one of which (33) is a hydrostatic seal. Between this hydrostatic seal (33) and the interior of the volute (21) is disposed an auxiliary seal (45) of the mechanical type. The auxiliary seal (45) separates two chambers (46a) and (46b) which can be brought into communication or isolated by a system of pipes (47) on which a valve (48) is disposed. The invention is particularly applicable to the primary pumps of a pressurized water nuclear reactor.
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