STEP 4
Open downstream isolation valve to establish flow through the
system.
STEP 5
Setting the Sustaining Control requires lowering the upstream
pressure to the desired minimum sustained pressure.
STEP 6
Leave the downstream isolation valve full open and close the up-
stream isolation valve until the inlet pressure drops to the desired
setting.
STEP 7
Adjust the Sustaining Control screw IN, clockwise, until the inlet
pressure begins to increase, or OUT, counterclockwise, to de-
crease, stopping at the desired pressure (See Figure 2).
4 IOM-ACV-116-5_6116-5 2115
EDP# 1917051
© 2021 Watts
IOM-ACV-116-5_6116-5 2115
EDP# 1917051
© 2021 Watts 5
Figure 2
PV20C — Pressure Sustaining Control
Clockwise to increase inlet
pressure
Counterclockwise to decrease
inlet pressure
