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Abstract: Directional-control-valves
is one of the key components in the hydraulic system of construction
machines. The development course of directional-control-valves is
summarized and the developing backgrounds and main defects are analyzed.
It is especially discussed that newly existed load-sensing compensation
technology, negative control and electrohydraulic proportional
directional control valves with electrohydraulic load sensing and
separate controlling of meter-in and meter-out orifices. At last, the
future trends of this field are presented.
Key
words: Directional
control valves Load-compensation Load-sensing Electrohydraulic
proportional technology Separate control of meter-in and meter-out
CLC No: TH137.5
Received 20050328,
received in revised form 20050528
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