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V
alve Adjustment
Make adjustments gradually. Adjust by 1/2
revolution and wait for the system to stabilize after
each adjustment change. The differential is not
adjustable.
•
To increase the operating head pressure
and decrease the water flow: Turn the
adjusting screw (Figure 8, inset) down, toward
main valve body (clockwise when viewed from
the top).
•
To decrease the operating head pressure
and increase the water flow: Turn the
adjusting screw up, away from main valve
body (counter-clockwise).
S
ervicing
The V43 valve can be disassembled, cleaned, and
reassembled without breaking the line connections.
To Access Internal Parts
1. Shut off water flow to the V43.
2. Remove the hex bolts (Figure 8) from the top
of the bellows flange.
3. Remove the bellows flange.
Note:
For internal parts replacement instructions,
refer to the respective replacement parts
instruction sheet.
Manual Flushing
Before starting equipment, manually flush the
valve to remove any foreign material from the
valve. Flushing before operation will prolong
equipment life and enhance valve performance.
1. Turn the adjusting screw (Figure 8, inset)
counterclockwise (when viewed from top),
raising the adjusting screw as far up as
possible.
2. Insert a standard screwdriver tip between the
adjusting screw and the push pin.
3. Pry the push pin down with the screwdriver to
open the valve as indicated.
4. Hold the push pin down to hold the valve open.
Flush the valve for several minutes, removing
all foreign matter from the V43.
8 V43 Pressure Actuated Water Regulating Valve Product/Technical Bulletin
5. After flushing the V43, remove the screwdriver
and set the adjusting screw to the desired
operating pressure. (Refer to the Valve
Adjustment section.)
Cleaning the Monel Screen
The pilot valve is protected from dirt, scales, etc.
by a fine mesh monel screen. To clean the
screen, shut off flow, unscrew hex bolt (Figure 8),
remove monel screen, brush, and rinse clean.
Draining the V43 During Shutdown
To reduce the possibility of freeze-up, drain the
V43 during shutdown. To drain, unscrew the drain
plug at the base of the V43. Refer to Figure 8.
Note:
In order to drain, the V43 must be
mounted in a horizontal water line with the
bellows up and the drain plug down.
Figure 8: Monel Screen, Drain Plug,
and Manual Flushing Procedures
(V43AV Shown)
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