Pipes and tubular conduits – With pressure compensators – Variable capacity chambers
Reexamination Certificate
2008-01-29
2008-01-29
Brinson, Patrick F. (Department: 3754)
Pipes and tubular conduits
With pressure compensators
Variable capacity chambers
C138S030000, C138S026000, C277S434000, C277S438000
Reexamination Certificate
active
07322377
ABSTRACT:
A hydraulic accumulator includes a piston (3) capable of moving in an accumulator housing (1) in its axial direction and separating a gas side (5) from a liquid side (7) of the accumulator housing (1). Guide elements (9, 17) designed to co-operate with the accumulator housing wall (1), as well as at least one sealing element (15), are arranged at the periphery of the piston. The sealing element is arranged offset in the axial direction relative to the guide elements (9, 17), and is located between the guide elements. In the piston (3), a pressure compensating channel (19) forms, at the piston periphery, a liquid flow path between the liquid side (7) and a space (2) located between the guide element (17) nearest to the liquid side (7) and the sealing element immediately next in the axial direction. A device (25) reducing the cross-section of the passage of the pressure compensating channel (19) is located in it.
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Brinson Patrick F.
Hydac Technology GmbH
Roylance Abrams Berdo & Goodman L.L.P.
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