STEP 8
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).
STEP 9
When the required level is reached, or if the tank is overflowing,
SLOWLY turn the adjustment screw OUT, counterclockwise, in ¼
to ½ turn increments See Figure 5). A small amount of water will
discharge from the vent/exhaust line of the Altitude Control, signal-
ing the port connection changes of both the Altitude Control and
accelerator. The valve will start closing as indicated by the position
indicator stem movement.
The following is dependent upon the installation/application and
may not be required on all valves: When the valve is closed, the
Altitude control screw adjustment may be turned OUT, counter-
clockwise, an additional ¼ to ½ turn (See Figure 5). This will lower
the shut-off level slightly below the tank over-flow mark, eliminating
any wave action discharge from the over-flow pipe.
STEP 10
Closing Speed Control 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 setpoint, turn the adjustment
screw OUT, counterclockwise, increasing the rate of closing (See
Figure 4B above).
STEP 11
Switch solenoid to closed position (energize solenoid) to check
that the main valve closes.
4 IOM-ACV-127-32_6127-32 2115
EDP# 1917061
© 2021 Watts
IOM-ACV-127-32_6127-32 2115
EDP# 1917061
© 2021 Watts 5
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
4A
4B
Figure 4
Flow Control
Counterclockwise to DECREASE
minimum tank level set point.
Figure 5
Model 27 - Altitude Pilot
