Improved hydraulic damper valve

Details Improved hydraulic damper valve Improved hydraulic damper valve

B - Operations, Transporting

21

J

B21J 15/22 (2006.01) B21J 15/06 (2006.01)

Patent

CA 2637777

A breakstem rivet placing tool conventionally includes a flow restrictions (14) for hydraulic fluid used to drive the tool in a stem pulling direction. This serves to prevent recoil of the tool due to rapid acceleration of an internal piston (4) when the stem of the breakstem rivet breaks. Prior art flow restrictions (14) create a jet (10) of high velocity hydraulic fluid into the tool which may damage components (26) by erosion. A revised fluid damper valve (14' ,14' ' ,14' ' ' ,40,42,42~) deflects and/or diffuses the fluid flow to avoid damage by erosion.

Conventionnellement, un outil de pose de rivet à rupture de tige comprend des moyens de limitation de flux (14) du fluide hydraulique utilisé pour actionner l'outil dans la direction d'extraction de la tige. Ceci empêche le recul de l'outil dû à l'accélération rapide d'un piston interne (4) lorsque la tige du rivet à rupture de tige se rompt. Les techniques de limitation de flux (14) de l'art antérieur créent un jet (10) de fluide hydraulique à haute vélocité à l'intérieur de l'outil qui peut endommager des pièces (26) par érosion. L'invention concerne un clapet d'amortisseur hydraulique modifié (14' ,14' ' ,14' ' ' ,40,42,42') qui dévie et/ou diffuse le flux de fluide afin d'éviter les dommages par érosion.

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