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
upstream isolation valve until the inlet pressure drops to the
desired setting.
STEP 10
Adjust the Sustaining Control screw IN, clockwise, until the inlet
pressure begins to increase (See Figure 4A), or OUT, counter-
clockwise (See Figure 4B), to decrease, stopping at the desired
pressure.
STEP 11
Allow pressure to stabilize.
STEP 12
Fine-tune the sustaining setting as required as detailed in STEP
10.
STEP 13
Open upstream isolation valve to return to normal operation.
4 IOM-ACV-127-8_6127-8 2115
EDP# 1917065
© 2021 Watts
IOM-ACV-127-8_6127-8 2115
EDP# 1917065
© 2021 Watts 5
5A
5B
Figure 5
PV20C — Pressure Sustaining Control
Clockwise to increase inlet
pressure
Counterclockwise to decrease
inlet pressure
