Hydraulic connection circuit between first and active hydraulic circuits

摘要

A connection circuit for connecting a first and an active hydraulic circuit. The first circuit is a fan or motor on an air cart which uses a fixed amount of volume. The active circuit is for applying a down pressure on a pulled, ground-working implement. The connection circuit also has a valve for switching the flow to the active circuit from the first circuit to the tractor hydraulics. In an alternative embodiment, there is an orifice and check valve or pressure relief valve for preventing the active circuit from withdrawing an excess amount of hydraulic flow from the first circuit.