以下为句子列表：
英文: This valve being mounted in the water distribution pipes with its pilot valve being pre-setted in a fixde flow-rate which enable the pressure variation of the main body's upper-reach not to have an effect on the flow volume of the outlet.
中文: 本阀安装于送配水管路中，可预先设定其上之导向阀于某一固定流量，使其主阀进口压力变化而不会影响出水口。
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