Setting the Sustaining Control
STEP 7
Slowly open downstream isolation valve to establish flow through
the system.
STEP 8
Setting the Sustaining Control requires lowering the upstream
pressure to the desired minimum sustained pressure.
STEP 9
Leave the downstream isolation valve full open and close the up-
stream isolation valve until the inlet pressure drops to the desired
setting.
Fine-tune the Reducing Control adjustment to the pressure reduc-
ing setpoint, as detailed in Step 7.
STEP 10
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-A-ACV-920-15_620-15 2115
EDP# 1917048
© 2021 Watts
IOM-A-ACV-920-15_620-15 2115
EDP# 1917048
© 2021 Watts 5
Figure 2
PV20C — Pressure Sustaining Control
Clockwise to increase inlet
pressure
Counterclockwise to decrease
inlet pressure
