Setting the Sustaining Control
Step 1
Setting The Relief/Sustaining Control requires lowering the
upstream pressure to the desired minimum sustained pressure.
Step 2
Leave the downstream isolation valve fully open and close the
upstream isolation valve until the inlet pressure drops to the
desired setting.
Step 3
Adjust the Relief/Sustaining Control screw IN, clockwise, until the
inlet pressure begins to increase, or OUT, counterclockwise to
decrease, stopping at the desired pressure (See Figure 4).
Step 4
Allow pressure to stabilize.
Step 5
Fine-tune the relief/sustaining setting as required as detailed in
Step 3.
Step 6
Open the upstream isolation valve to return to normal operation.
Clockwise to INCREASE
inlet pressure
Counterclockwise to DECREASE
inlet pressure
Figure 4
PV20C — Pressure Sustaining Control
4 IOM-A-ACV-912_612 2115
EDP# 1917034
© 2021 Watts
IOM-A-ACV-912_612 2115
EDP# 11917034
© 2021 Watts 5
