STEP 6
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 valve opening is too slow, turn the adjustment screw OUT,
counterclockwise, increasing the rate of opening (See Figure 4B).
If valve opening is too quick, turn the adjustment screw IN, clock-
wise, decreasing the rate of opening (See Figure 4A).
Setting the Altitude Pilot
STEP 4
Slowly open the downstream isolation valve to establish flow
through the system.
STEP 5
If the valve remains closed as indicated by the stem position in
the position indicator (See Figure 2) and the tank level is known
to be below the desired level, SLOWLY turn the adjustment screw
IN, clockwise, by ¼ to ½ turn increments (See Figure 3).
This will cause the valve to start opening, filling the tank.
Additional clockwise adjustment may be necessary to raise the
level to the overflow line.
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
Clockwise to INCREASE
minimum tank level set
point.
4A
4B
Figure 4
Flow Control
4 IOM-ACV-127-1_6127-1 2115
EDP# 1917055
© 2021 Watts
IOM-ACV-127-1_6127-1 2115
EDP# 1917055
© 2021 Watts 5
Figure 3
Model 27 - Altitude Pilot
Figure 2
Position Indicator Stem in Down Position
Indicating Valve Closed
