Page 353 - Water Loss Control

322 Cha pte r Ei g h tee n

2 2

C
1
P/L
X

3A

FC
YX
3B
Flow
1

FIGURE 18.15 Ball valve control.

FIGURE 18.16 Calibrating a ball valve.
Altitude valves are usually installed on bottom filling tanks and storage, as can be
seen in the photograph in Fig. 18.18, however, they can be installed on top filling tanks
if the sense line is connected to the outlet pipe.
Care should be taken not to install the altitude valve too far away from the tank, as
this will create delayed reactions and poor control. Manufacturers supply good instal-
lation diagrams, which should be adhered to. Altitude valves can be installed on unidi-
rectional pipes and on bidirectional pipes and can be set for on–off response or relational
response.