Badger Meter Research Control Valve - Manual (Page 6)

3. Raise innervalve and screw the stem connector on
topworks stem until the two stems are butted together.
4. Install travel pointer between stem connector and
locknut on topworks stem. Hold stem connector in place
and tighten topworks stem nut against the travel pointer
positioned 1/32" to 1/16" away from travel scale.
Stroke Adjustment and Pressure Test
1. With valve completely assembled and with a manually
regulated supply (3-15 PSIG) to the topworks, adjust
with spring adjuster until valve stroke is corresponding
to the normal 3-15 PSIG instrument signal. To set this
precisely, pipe 90 PSIG air to the upstream port and
with rubber tubing piped from downstream port, bubble
check shutoff point. (Fig. 8)
2. Set air-to-open valves to open at 3-1/4" PSIG.
3. Set air-to-close valves to close at 14-3/4" PSIG.
4. Nominal stem travel of 7/16" for 1/4" valves and
9/16" for 1/2", 3/4", and 1” valves is fixed in the topworks
spring rate for a 12 PSIG span. If valve has been set
with a high bench setting because of pressure, full travel
may not occur at 15 PSIG.
5. If necessary, reposition travel scale relative to stroke.
6. Pressure test all seals with 90 PSIG air piped to the
upstream port, downstream port plugged with
valve open. Using a plastic squeeze bottle filled with a
soapy water solution, flood each joint and inspect for
leaks. Check and tighten packing just until no leak is
visible. Do not over-tighten. (Fig. 9)
7. Normal hysteresis (dead band) in valve stroke should
be no more than 1/4 PSIG instrument signal. This can
be checked by placing the thumb and forefinger on the
valve stem in contact with the packing gland and
regulating manually the 3-15 PSIG instrument signal
(gauge in line), visually watching gauge and feeling
movement. (Fig. 10)
FIG. 8
FIG. 9
FIG. 10
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