Hydraulic control for pivot mounted plough

摘要

The plough mounting is fitted with a pressure control valve (27) which regulates the pressure peaks on the plough and which causes the plough to lift when hitting obstructions. To provide a smooth pivot action, the valve is bypassed during the pivot movement and holds the flow valve (2) in either position, e.g. raising or lowering of the plough.Two additional control lines (34, 39) from the control valve to the flow control valve provide the pivot action control. The flow control operates at a higher control pressure than the output of the control valve and dominates the pivot action.