Liquid Controls V-7 Valves - Manual (Page 9)

9
V-7 Valves
Because of the interaction between the valve and the
preset counter, some adjustment may be needed to the
preset counter so that components work at optimum
efficiency. Preset Counters assembled with meters at
the factory are adjusted for proper shut-off timing. Due
to meter system variations, such as flow rate and
viscosity, it may be necessary to make zero shut-off
adjustments.
At least two test runs should be completed before any
adjustments are made. On all presets, make a test run
using a value large enough to permit the meter to reach
its normal flow rate. If it is determined after testing that
an error in zero shut-off is indicated, correct the zero
shut-off in the following manner.
1. Start by removing the eight screws that hold the bezel
to the preset counter.
2. Remove the bezel (Figure 16a).
3. Press the preset button directly below the units wheel
until the set screw appears in the opening.
4. Use a screwdriver to loosen the set screw on the
notch ring located on the left side of the units wheel
(Figure 16b). This allows for the repositioning of the
notch ring and units wheel.
5a. Early Shut-off
To correct an early shut-off, hold the notch ring in
place (Figure 16c) and move the numbers wheel
down enough to correct the misalignment.
5b. Late Shut-off
To correct a late shut-off, hold the notch ring in place
(Figure 16c) and move the numbers wheel up enough
to correct the misalignment.
6. After each adjustment, carefully tighten the set screw.
Take care not to strip the threads with excessive
torque.
7. After running two test runs, the zero should be
centered in the window. If not, reset the notch ring
and repeat the procedure.
8. Ensure that the set screw is tight and remount the
bezel.
Adjusting Zero Shut-off (LC Preset)
Figure 16a: Bezel Removal
Figure 16c: Set Screw Adjustment
Figure 16b: Set Screw & Notch
Ring