Each balancing valve shall be in the full open ( nominated ) position prior to commencing the proportional balancing of water distribution systems 在水分流系统开始进行比例平衡之前，每个平衡阀应该位于全开(指定)位置。
2.
The initial scan of the flow rate in all the valves in the system will determine the % design flow rate ( dfr ) of each valve and consequently a procedure for proportional balancing 系统内所有阀门的流动速率的最初纪录将决定每个阀门的%设计流动速率( dfr )以及随后的比例平衡程序。
