4 IOM-ACV-113-19_6113-19 2115
EDP# 1917091
© 2021 Watts
IOM-ACV-113-19_6113-19 2115
EDP# 1917091
© 2021 Watts 5
Setting the Sustaining Control
STEP 7
Setting the Sustaining Control requires lowering the upstream
pressure to the desired minimum sustained pressure.
STEP 8
Leave the downstream isolation valve full open and close the
upstream isolation valve until the inlet pressure drops to the
desired setting.
STEP 9
Adjust the Sustaining Control screw IN, clockwise, until the inlet
pressure begins to increase (See Figure 3A), or OUT, counter-
clockwise, to decrease (See Figure 3B), stopping at the desired
pressure.
STEP 10
Allow pressure to stabilize.
STEP 11
Fine-tune the sustaining setting as required as detailed in STEP 8.
STEP 12
Open upstream isolation valve to return to normal operation.
STEP 12
De-energize solenoid to check that the main valve closes.
STEP 13
At valve closure booster pump will stop. Adjust limit switch collar
to final position to ensure positive actuation of limit switch elec-
trical contact, if necessary, by sliding up/down to location (See
Figure 4).
STEP 6
Opening Speed Flow Control Adjustment: The Opening speed
needle valve restricts flow out of the cover of the main valve.
If the main valve is opening too slowly turn the adjustment screw
OUT, counterclockwise, increasing the rate of opening (See Figure
2B).
If the main valve is opening too quickly, turn the adjustment screw
IN, clockwise, decreasing the rate of opening (See Figure 2A).
Figure 4
Limit Switch in Closed Position
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
2A
2B
Figure 2
Flow Control
Figure 3
PV20C — Pressure Sustaining Control
Clockwise to increase inlet
pressure
3A
3B
Counterclockwise to decrease
inlet pressure
