| 摘要 |
A safety circuit which is essentially for supplyng hydraulic loads. Briefly stated, this circuit has a control pump which, via a priority valve, supplies hydraulic power to a power steering hydraulic circuit and at least one other load hydraulic circuit on a priority basis where the power steering receives the highest priority. Also provided is a control circuit which limits the intake pressure of the control pump and has a safety valve associated with it which is controlled by the intake vacuum of the control pump. This valve effects a reduction of the pump output when pressure in the suction line from the hydraulic fluid storage container drops below a minimum pressure. The safety valve cooperates with the priority valve such that it brings the priority valve into a first operational condition when there is sufficient suction pressure thereby supplying power to the power steering hydraulic circuit and other loads, and into a second operational condition in which the flow of hydraulic fluid to all loads but the power steering circuit is interrupted. The safety valve therefore prevents cavitation in the control pump while providing for a provision of hydraulic fluid to only the power steering circuit when the volume of hydraulic fluid in the system falls below a predetermined value.
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