4 IOM-A-ACV-986_686 2115
EDP# 1917094
© 2021 Watts
IOM-A-ACV-986_686 2115
EDP# 1917094
© 2021 Watts 5
needle valve regulates fluid pressure into the main valve cover
chamber, controlling the valve closing speed.
If valve closing is too slow, turn the adjustment screw OUT, coun-
terclockwise, increasing the rate of closing.
STEP 9
At valve closure booster pump will stop. Adjust limit switch collar
to final position to ensure positive actuation of limit switch electri-
cal contact, if necessary, by sliding up/down to location. (See
Figure 3).
STEP 5
Energize the solenoid at pump start to open the main valve,
checking that the main valve opens. Air is vented through the
loosened fitting. Tighten the fitting when liquid begins to vent.
STEP 6
Opening Speed Flow Control Adjustment: The Opening speed
needle valve restricts flow into the cover and restricted flow out of
the cover of the main valve.
If valve opening is too slow, turn the adjustment screw OUT,
counterclockwise, increasing the rate of opening (See Figure 2B).
If valve opening is too quick, turn the adjustment screw IN,
clockwise, decreasing the rate of opening (See Figure 2A).
STEP 7
De-energize solenoid to check that the main valve closes.
STEP 8
Closing Speed Needle Valve Adjustment: The closing speed
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
2A
2B
Figure 2
Flow Control
Figure 3
Limit Switch in Closed Position
