Sms Group Gmbh

Ekhard Siemer

Uwe Muschalik

Hermann-Josef Klingen

Andreas Wershofen-Crombach

Karl Herrmann Claasen

Valentin Gala Losada

A double-rod ram (), preferably for an extruder, comprising an outer cylinder (), an inner cylinder () installed therein and arranged concentrically therewith, a double-acting work piston () provided in the inner cylinder to be displaceable and a bypass device () with at least one bypass valve (), wherein the work piston () divides the inner cylinder () into two compartments () and can be loaded with a hydraulic fluid from both compartments (), wherein the bypass device () is so arranged that in a bypass position of the bypass valve () a fluid connection between the two compartments () is formed by a direct connection, preferably at least one bypass line, and in a work position of the bypass valve () no such fluid connection is present.

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Veitshoechheim, Germany

Ekhard Siemer