在原有PCM流量控制阀组中加上一个定差减压阀，使压力差近似保持定值。
An invariableness pressure decompression valve is added to common PCM to keep pressure discrepancy invariable approximately.
阐述了电液先导控制阀组的控制原理和结构特点，介绍了先导阀组的试验原理和步骤。
The control concepts and configuration characteristic are detailed, as well the experiment principle and process of the pilot valves are introduced.
阐述了电液先导控制阀组的控制原理和结构特点，介绍了先导阀组的试验原理和步骤。
The control concepts and configuration characteristic are detailed, as well the experiment principle and process of the pilot valves are introduced.
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