Page 354 - Water Loss Control
P. 354
Contr olling Real Losses—Pr essur e Management 323
8
Sense line (tank head) P/L
Cover of accelerator drained X
to atmosphere
D
C
3
2 6
4 YX X
FC
Flow
5 1
7
FIGURE 18.17 Altitude valve diagram.
FIGURE 18.18 Altitude valve installation.
18.17.3 Demand Control Using Flow and Sustaining Valves
Some systems find that during peak flow conditions certain parts of the system are
hydraulically deficient. In many cases when this occurs, certain consumers will use
most of the water while leaving only a small volume for others. This is often so in the
case of very large consumers, who create large, localized head losses. It is also often
seen in the case of irregular settlements in developing country situations.
