Step 2
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 4).
Step 3
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.
Setting the Pressure 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 5).
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 5
PV20C — Pressure Sustaining Control
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
Figure 4
Flow Control
4 IOM-A-ACV-912-11_612-11 2115
EDP# 1917038
© 2021 Watts
IOM-A-ACV-912-11_612-11 2115
EDP# 11917038
© 2021 Watts 5
