STEP 8
Allow pressure to stabilize.
STEP 9
Fine-tune the sustaining setting as required as detailed in Step 7.
STEP 10
Open upstream isolation valve to return to normal operation.
STEP 11
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.
(IF INSTALLED) Opening Speed Flow Control Adjustment: The
Opening speed flow control allows free flow into the cover and re-
stricted flow out of the cover of the main valve. If recovery of pres-
sure is slow upon increased downstream demand, turn the adjust-
ment screw OUT, counterclockwise, increasing the rate of open-
ing. 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).
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
Figure 3
Flow Control
4 IOM-A-ACV-920-01_620-01 2115
EDP# 1917052
© 2021 Watts
IOM-A-ACV-920-01_620-01 2115
EDP# 1917052
© 2021 Watts 5
