Patent ID: 8935919
Filing Date: 2015-01-20
Classification: B66C,B66F,E02F,F15B,Y10T

Abstract:
1. Method of controlling a load sensing hydraulic system with a bypass valve, which is controlled by a pump pressure and which when the hydraulic system is in operation diverts a pump flow of hydraulic fluid to a tank port and which is pre-stressed towards a closed position and by means of the pump pressure is loaded towards an open position against the action of the pre-stress, characterised in that the pre-stress is initially limited to a first pressure that is determined by a first pre-stress force, wherein the pre-stress is increased to a second, substantially higher pressure upon activation of the hydraulic system by applying a hydraulic, constant second pre-stress force, that is added to the first pre-stress force and is substantially greater than the first pre-stress force.