文档介绍：of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of t筑装饰隐蔽的敷设方法。
2．1．16 分水器 manifold集中控制多支路供水的管道附件。
2．1．19 线胀系数 coefficient of line-expansion温度每增加1
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
℃时，管线单位长度的增量。
2．1．20 卫生器具 plumbing fixture，fixture
供水并接受、排出污废水或污物的容器或装置。
2．1．21 卫生器具当量 fixture unit
以某一卫生器具流量(给水流量或排水流量)值为基数，其他卫生器具的流量(给水流量或排水流量)值与其的比值。
2．1．22 额定流量 ominal flow卫生器具配水出口在单位时间内流出的规定水量。
2．1．23 设计流量 designflow
给水或排水某种时段的平均流量作为建筑给排水管道系统设计依据。
2．1．24 水头损失 head loss水通过管渠、设备、构筑物等引起的能耗。
2．1．25 气压给水 pneumatic water supply
由水泵和压力罐以及一些附件组成，水泵将水压入压力罐，依靠罐内的压缩空气压力，自动调节供水流量和保持供水压力的供水方式。
2．1．26 配水点 points ofdistribution给水系统中的用水点。
2．1．27 循环周期 circulating period
循环水系统构筑物和输水管道内的有效水容积与单位时间内循环量的比值。
2．1．28 反冲洗 backwash当滤料层