Hydraulic adjusting device with a safety valve for rolling stands

摘要

In order, for reasons of space, to make the bottom wall of the cylinder of a hydraulic adjusting device for rolling stands thin, a piston designed as a stepped piston is provided with a relief line which is controlled by a piloted non-return valve and extends between the high-pressure side and the low-pressure side of the piston. The non-return valve is opened when it strikes a feeler on the cylinder cover, and it is thus impossible for the high pressure to build up in the case of a test since the bottom of the cylinder is not supported by a roll chock over an extended area.