CONSTANT PRESSURE HYDRAULIC CIRCUIT WITH RELIEF PROTECTION INDEPENDENT OF PRESSURE CIRCUIT

摘要

A hydraulic circuit for an agricultural implement consisting of a hydraulic cylinder that exerts a force on a component of the implement. A pressure reduction valve located between a hydraulic power source and the hydraulic cylinder maintains pressure to no more than a preset maximum to protect the hydraulic cylinder by routing excess hydraulic fluid back through a hydraulic line into a reservoir. A pressure relief valve with a preset maximum pressure greater than that of the pressure reduction valve is located between the pressure reduction valve and the hydraulic cylinder, and is connected to the reservoir through a dedicated return line. If hydraulic fluid pressure in the circuit increases to greater than the maximum of the pressure reduction valve, hydraulic fluid is diverted back to the reservoir through the pressure relief valve and a dedicated return line.

主权项

1. A hydraulic circuit for an agricultural implement, comprising:
a hydraulic cylinder; a first hydraulic line connecting a hydraulic power source to the hydraulic cylinder; a pressure reduction valve provided in the first hydraulic line, the pressure reduction valve having a first predetermined maximum pressure setting; a hydraulic line positioned between the pressure reduction valve and the hydraulic cylinder, connecting a pressure relief valve having a second predetermined maximum pressure setting, wherein, when a pressure of hydraulic fluid in the portion of the first hydraulic line between the pressure control valve and the hydraulic cylinder is greater than the second predetermined maximum pressure setting, the pressure relief valve opens such that hydraulic fluid flows from the first hydraulic line through a second hydraulic line to a reservoir.