Circuit for controlling paper cutting machine press beam hydraulic drive has press beam cylinder annular chamber connected so medium displaced in off position flows to base chamber

摘要

The circuit has the output of a first control stage (24) connected to the input and hydraulic control input (28) of a controllable valve (26) whose output is connected to a base chamber (16) of a press beam cylinder for both valve settings. The annular chamber (18) of the press beam cylinder (10) is connected to at least a second valve connection (34) so that the medium displaced from the annular chamber in the off position flows into the base chamber. In the on position the connection between the output and second connection is only via a choke (36).