阀组主要分为二阀组，三阀组，五阀组，二组阀是二个单阀组合在一起，三组阀是三个单阀组合在一起，五组阀是五个单阀组合在一起。
仪器由一个已知体积的球管和一个阀组或管网所组成。
The apparatus consists of a bulb of known volume and valve block or manifold.
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.
由于我司生产的抓斗阀组带压力补偿功能，流量跟外负载无关，速度不随负载波动。
The valve group is provided with the function of pressure compensation, which keeps the speed stable, not influenced by external load.
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