Zahnradfabrik Friedrichshafen, Ag.

Reiner Eisenmann

Ulrich Aldinger

Ekkehard Alschweig

A flow regulating valve for rotation piston pumps to regulate a useful flow, especially for auxiliary power steering in motor vehicles, contains in a valve core (2) an axially-movable, spring-loaded flow regulating piston (3). On one front surface (4) of the flow regulating piston (3), there is a control edge (14) by means of which a flowoff cross section in a flowoff duct (15) can be altered. To reduce the flow noises, control edge (14) has a rounded portion (17) at the transition to the generated surface (16) of the flow regulating piston (3). In addition, control edge (14) reveals a negative bezel (18). A positive bezel (21) is arranged between this negative bezel (18) and the rounded portion (17) that adjoins generated surface (16).

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Welzheim, Germany

Reiner Eisenmann