| 主权项 |
1. A pilot pressure control system for controlling a pilot signal pressure at a pilot inlet of a control valve, the pilot pressure control assembly comprising a pilot outlet adapted to be connected to said the pilot inlet, wherein said the pilot pressure control assembly further comprises a first pilot valve assembly and a second pilot valve assembly, each one of the first and second pilot valve assemblies being individually controllable so as to selectively provide a first fluid flow direction from a pressure line to the pilot outlet and a second fluid flow direction from the pilot outlet to a drain line, at least said the first pilot valve assembly being adapted to assume a maximum pressure supply condition so as to supply a first pilot valve assembly maximum pressure to the pilot outlet, at least the second pilot valve assembly being, adapted to provide a pressure drop from the pilot outlet to the drain line via said the second pilot valve assembly, the pilot pressure control system being configured such that, when the pilot pressure control system is connected to the pressure and drain lines and when said the first pilot valve assembly is controlled so as to assume the maximum pressure supply condition and the second pilot valve assembly provides a fluid flow in said the second fluid direction with a minimum pressure drop, the pressure at the pilot outlet is equal toot above 20% of the first pilot valve assembly maximum pressure. |
