Piston-cylinder unit having a sealing valve

Details Piston-cylinder unit having a sealing valve Piston-cylinder unit having a sealing valve

1998-02-19

1999-11-23

Schwartz, Chris

Spring devices

Fluid

Expansible-contractible chamber device

188300, 18832218, F16F 902

Patent

active

059886080

ABSTRACT:
A piston-cylinder unit includes a piston which divides the cylinder into two working chambers, a sealing valve seals a flow path between the two working chambers in the stationary operating condition of the unit. The sealing valve has a valve element consisting of an axially movable radially sealing sealing ring in conjunction with a valve ring, which at its back is supported by a spring-biased member. The slide member and the valve ring form therebetween a flow-off chamber having a flow-off opening that is sized so that unrestricted fluid flow is permitted so as to prevent the formation of a ram pressure in the flow-off chamber. The sealing ring is movable between three axial positions relative to the valve ring. At a center position, the sealing ring seals the flow path against fluid flow. At the two other positions, the sealing ring permits fluid flow in opposite directions.

REFERENCES:
patent: 4156523 (1979-05-01), Bauer
patent: 4433759 (1984-02-01), Ichinose
patent: 4595182 (1986-06-01), Freitag et al.
patent: 5560456 (1996-10-01), Koch et al.
patent: 5702091 (1997-12-01), Perrin et al.
patent: 5797593 (1998-08-01), Oyaizu

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