F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/77
F15B 13/06 (2006.01) F15B 11/02 (2006.01)
Patent
CA 1159747
ABSTRACT OF THE DISCLOSURE The invention provides a flow distribution system for pressure medium for steering hydraulics of machines with two or more pumps. A flow distribution valve controlls pumps of a feed pressure medium via the distri- bution valve through the steering valve to the selected operative unit and, on the other hand, to what extent the output of the pumps is directed to the tank channel, and in which system a coil spring is arranged as acting upon one end of the flow-control shaft in the flow distribution valve, which spring presses the shaft to one of its extreme positions, in which extreme position all pumps of the system feed pressure medium through the flow distribution valve via the steering valve to the operative unit. The invention is characterized by a force determined by the magnitude of the loss of pressure on the output side of the steering valve which is arranged as acting upon the flow- control shaft against the spring force of the coil spring whereby the position of the flow-control shaft is deter- mined by means of the pressure difference between the pressure in the pressure medium coming from the flow distribution valve to the steering valve and the pressure in the pressure medium in the working cylinder connected to the steering valve.
330307
Mcfadden Fincham
Oy Rauma-Repola
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