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Counterclockwise to DECREASE
minimum tank level set point.
Step 7
As the required level is reached the position indicator stem will
begin moving down from the open position shown in Figure 5. If
the tank is overflowing, SLOWLY turn the adjustment screw OUT,
counterclockwise, in ¼ to ½ turn increments (See Figure 6). A
small amount of water will discharge from the vent/exhaust line
of the Altitude Control, signaling the port connection changes of
both the Altitude Control and accelerator.
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 turned OUT, counter-
clockwise, an additional ¼ to ½ turn. 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 8
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 valve closing is too
slow, turn the adjustment screw OUT, counterclockwise, increas-
ing the rate of closing.
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 turned OUT, counter-
clockwise, an additional ¼ to ½ turn. This will lower the shut-off
level slightly below the tank over-flow mark, eliminating any wave
action discharge from the over-flow pipe.
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 6
Model 27 - Altitude Pilot
Figure 5
Position Indicator Stem in UP Position
Indicating Valve OPEN