Sealing system
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United States of America Patent
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-
Dec 30, 1997
Grant Date -
N/A
app pub date -
Nov 29, 1995
filing date -
Apr 15, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piston reciprocally movable within a cylinder is sealed to the cylinder wall by fluid at a pressure greater than those of the fluids on the opposed sides of the piston supplied to the space (18) between two seals (19, 20) operative between the piston and cylinder wall, an accumulator or auxiliary intensifier chamber (67) being provided from which overpressure fluid is supplied to the space between the two seals to regulate the pressure between them. The two seals between the piston and the cylinder wall can be constituted respectively by first (19A-19C) and second (20A-20C) groups or pluralities of separate seal rings selected as regards material and dimensions so as to perform specific functions. Also, a sealing system between a piston and a cylinder within which the piston is reciprocally movable can comprise a forward seal (19, 20), conveniently having two seals or seal ring groups, separating a process or working fluid (4) being moved by the piston, from a second fluid (7) in the space around the piston, and a rearwardly spaced barrier seal (21A-21C) separating the second fluid from a third fluid filling a housing (6) containing a motor by which the piston is driven.
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