4 IOM-A-ACV-985-20_685-20 2115
EDP# 1917104
© 2021 Watts
IOM-A-ACV-985-20_685-20 2115
EDP# 1917104
© 2021 Watts 5
Closing Speed Flow Adjustment (located on the lower chamber):
While free flow goes into the upper chamber, the closing speed
flow control restricts flow out of the lower chamber of the main
valve.
If valve closing is too slow, turn the adjustment screw OUT, coun-
terclockwise, increasing the rate of closing.
STEP 5
Setting the Relief Control
Figure 2
Flow Control
Counterclockwise to INCREASE
the rate of closing
Clockwise to DECREASE
rate of closing
2A
2B
STEP 6
While pump is operating at normal pressure conditions, slowly
turn relief pilot adjusting screw counterclockwise (See Figure 3B).
STEP 7
When main valve begins to open screw pilot adjusting screw
clockwise until valve closes, then continue to turn clockwise an
additional ½ turn to set relief control (See Figure 3A).
STEP 8
When pump demand is satisfied, pump will continue to operate
as the main valve opens. To open main valve, de-energize the
solenoid, checking that the main valve opens.
STEP 9
Opening Speed Needle Valve Adjustment (located on the upper
chamber): While free flow goes into the lower chamber, the
Opening speed flow control restricts flow out of the upper cham-
ber of the main valve.
If valve opening is too slow, turn the adjustment screw OUT,
counterclockwise, increasing the rate of opening.
If valve opening is too quick, turn the adjustment screw IN, clock-
wise, decreasing the rate of opening.
STEP 10
At valve full open position deep well pump will stop. Adjust limit
switch collar to final position to ensure positive actuation of limit
switch electrical contact, if necessary, by sliding up/down to loca-
tion (See Figure 4).
Figure 4
Limit Switch in Open Position
Figure 3
PV20C — Pressure Relief Control
Clockwise to increase inlet
pressure
3A
3B
Counterclockwise to decrease
inlet pressure
