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.
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.
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