Cut-in-cut-out valves for hydraulic circuits

摘要

Cut-in-cut-out valves for hydraulic circuits. The hydraulic circuits include a hydraulic pump outputting a variable pressure controlled by a slaving line, an accumulation circuit, a return line to the reservoir, a cut in-cut-out valve. The hydraulic circuits also include a cut-in-cut-out valve having four orifices, a first orifice connected to the supply line, a second orifice connected to the slaving line, a third orifice connected to the return line leading to the reservoir, and a fourth orifice connected to the accumulation circuit. The cut-in-cut-out valve alternates between two positions as a function of the pressure in the accumulation circuit, a cut-in position in which the first, second and fourth orifices are connected to each other, and a cut-out position in which the first and fourth orifices are closed.

主权项

1. Hydraulic circuit comprising:
a hydraulic pump outputting a variable pressure, said hydraulic pump supplying a supply line and being controlled by a slaving line, an accumulation circuit comprising at least one accumulator, a return line to the reservoir connected to an atmospheric pressure reservoir, a cut-in-cut-out valve, wherein the cut-in-cut-out valve comprises four orifices: a first orifice connected to the supply line, a second orifice connected to the slaving line, a third orifice connected to the return line leading to the reservoir, a fourth orifice connected to the accumulation circuit, said cut-in-cut-out valve having two positions: a cut-in position in which the first, second and fourth orifices are connected to each other, while the third orifice is closed, a cut-out position in which the first and fourth orifices are closed, while the second orifice is connected to the third orifice, so as to isolate the accumulation circuit from the supply line; said cut-in-cut-out valve being adapted to change from the cut-in position to the cut-out position when the pressure in the accumulation circuit reaches a threshold value.