公开(公告)号：US20190017522A1

公开(公告)日：2019-01-17

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

CPC classification number: F15B13/021 ,  F15B11/22 ,  F15B15/1428 ,  F15B15/149 ,  F15B15/202 ,  F15B2211/7054

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.