Patent ID: 7810424

Claim:
Device for increasing pressure in cylinders ( 1 ), especially those of the hydraulic construction ( 2 ) used in underground mining and tunnel construction, which, together with the cylinder housing ( 14 ), piston ( 15 ), piston rod ( 16 ) thereof and the tensioning piston ( 17 ) arranged therein, and the tensioning piston rod ( 18 ) which can be inserted into the cylinder space ( 20 ), can be actuated with a hydraulic medium by means of a high-pressure pump ( 23 ), via a connection line ( 22 ) with an integrated control unit ( 21 ), wherein the control unit ( 21 ) has a releasable check valve ( 25 ) in the connection line ( 22 ′) between the high-pressure pump ( 23 ) and the piston rod cavity ( 26 ), and a valve block ( 28 ) with releasable and/or blockable additional check valves ( 29 , 30 , 31 ) in the connection line ( 22 ″) between the high-pressure pump ( 23 ) and the cylinder space ( 20 ).