Setting the Sustaining Pilot
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 (See Figure 3A),
until the inlet pressure begins to increase, or OUT, counterclock-
wise (See Figure 3B) to decrease, stopping at the desired pres-
sure.
STEP 10
Allow pressure to stabilize.
STEP 11
Fine-tune the sustaining setting as required as detailed in STEP 9
STEP 12
Open upstream isolation valve to return to normal operation.
STEP 5
With a demand for flow on the system, the valve can now be
adjusted for the proper flow rate. This requires a meter to read
the flow that the valve is providing.
STEP 6
While reading the meter register, adjust the Rate of Flow Control:
Turn the adjustment screw IN, clockwise, to increase the flow rate
regulated (See Figure 2A).
Turn the adjustment screw OUT, counterclockwise, to reduce or
lower the flow rate regulated (See Figure 2B).
Setting the Rate-of-Flow Pilot
4 IOM-ACV-114-8_6114-8 2115
EDP# 1917077
© 2021 Watts
IOM-ACV-114-8_6114-8 2115
EDP# 1917077
© 2021 Watts 5
Figure 3
PV20C — Pressure Sustaining Control
Clockwise to increase inlet
pressure
3A
3B
Counterclockwise to decrease
inlet pressure
Counterclockwise to REDUCE
Flow Rate Regulated
Clockwise to INCREASE
Flow Rate Regulated
2A
2B
Figure 2
CP14-1 Rate-of-Flow Control Pilot
