ES-A-ACV-LF960GD-15-17 2115
STEP 8
Opening Speed Flow Control Adjustment: The Opening speed
needle valve restricts flow out of the cover of the main valve.
If recovery of pressure is slow upon increased downstream
demand, turn the adjustment screw OUT, counterclockwise,
increasing the rate of opening (See Figure 4B).
If recovery of downstream pressure is too quick, as indicated
in a rapid increase in pressure, possibly higher than the desired
setpoint, turn the adjustment screw IN, clockwise, 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. This will lower the shut-off
level slightly below the tank over-flow mark, eliminating any wave
action discharge from the over-flow pipe (See Figure 5).
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).
STEP 11
Switch solenoid to closed position (energize solenoid) to check
that the main valve closes.
21
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
© 2021 Watts
Installation, Operation and Maintenance - Series LF960GD-15-17
