Setting the Sustaining Control
STEP 1
Slowly open downstream isolation valve to establish flow through
the system.
STEP 2
Setting the Sustaining Control requires lowering the upstream pres-
sure to the desired minimum sustained pressure.
STEP 3
Leave the downstream isolation valve full open and close the up-
stream isolation valve until the inlet pressure drops to the desired
setting.
STEP 4
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).
STEP 5
Allow pressure to stabilize.
STEP 6
Fine-tune the sustaining setting as required as detailed in STEP 4.
STEP 7
Open upstream isolation valve to return to normal operation.
4 IOM-A-ACV-920-01-15_620-01-15 2115
EDP# 1917050
© 2021 Watts
IOM-A-ACV-920-01-15_620-01-15 2115
EDP# 1917050
© 2021 Watts 5
Figure 2
PV20C — Pressure Sustaining Control
Clockwise to increase inlet
pressure
Counterclockwise to decrease
inlet pressure
