Hydraulic press has an improved non-return check valve of a tubular design for control of the hydraulic working fluid to give more rapid opening and closing of the valve at a smaller cost than existing disk type valves

摘要

Hydraulic press has a check or cutoff valve (15) with a valve piston (16) that is switched between open and closed position by hydraulic pressure. The valve piston (16) is in the form of a tube and inserts into a circular groove (17) in a valve housing (18) to a tight seal is made. Hydraulic operating fluid is connected to the valve via a pipe connection (19).