公开(公告)号：US10670052B2

公开(公告)日：2020-06-02

申请号：US16066701

申请日：2017-02-01

Applicant: SMS GROUP GMBH

Inventor： Hermann-Josef Klingen ,  Uwe Muschalik ,  Ekhard Siemer ,  Karl Herrmann Claasen ,  Valentin Gala Losada ,  Andreas Wershofen-Crombach

IPC: F15B13/02 ,  F15B15/14 ,  F15B15/20 ,  F15B11/22

Abstract: A double-rod ram (1), preferably for an extruder, comprising an outer cylinder (10), an inner cylinder (20) installed therein and arranged concentrically therewith, a double-acting work piston (41) provided in the inner cylinder to be displaceable and a bypass device (50) with at least one bypass valve (52), wherein the work piston (41) divides the inner cylinder (20) into two compartments (42) and can be loaded with a hydraulic fluid from both compartments (42), wherein the bypass device (50) is so arranged that in a bypass position of the bypass valve (52) a fluid connection between the two compartments (42) is formed by a direct connection, preferably at least one bypass line, and in a work position of the bypass valve (52) no such fluid connection is present.