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STEP 4
Open downstream isolation valve partially to establish flow
through the valve, observing downstream pressure change. If
downstream pressure is outside the desired pressure range, turn
the Reducing Control adjustment screw IN, clockwise, to increase
or OUT, counterclockwise, to decrease until pressure is near the
desired setting (See Figure 2).
STEP 5
Gradually open downstream isolation valve until full open.
STEP 6
Fine-tune the Reducing Control adjustment to the pressure
reducing set point, as detailed in Step 4.
Step 7
Opening Speed Flow Control Adjustment: The Opening speed
flow control allows free flow into the cover and restricted flow
out of the cover of the main valve. If recovery of pressure is
slow upon increased downstream demand, turn the adjustment
screw OUT, counterclockwise, increasing the rate of opening. IF
recovery of downstream pressure is too quick, as indicated in a
rapid increase in pressure, possibly higher than the desired set-
point, turn the adjustment screw IN, clockwise, decreasing the
rate of opening (See Figure 3).
Step 8
(If the main valve comes equipped with a closing speed control,
otherwise ignore this step)
Closing Speed Needle Valve Adjustment: The closing speed
needle valve regulates fluid pressure into the main valve cover
chamber, controlling the valve closing speed. If the downstream
pressure fluctuates slightly above the desired set point, turn the
adjustment screw OUT, counterclockwise, increasing the rate of
closing.
4
IOM-A-ACV-912-01_612-01 2115
Clockwise to INCREASE
downstream pressure
CP15 — Pressure Reducing Control
Clockwise to DECREASE
rate of opening
EDP# 1917032
Counterclockwise to DECREASE
downstream pressure
Figure 2
Counterclockwise to INCREASE
the rate of opening
Figure 3
Flow Control
© 2021 Watts
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