Badger Meter Research Control Valve - Manual (Page 10)

3. Loosen stem connector locknut above travel indicator.
4. Loosen yoke nut holding topworks to bonnet.
5. Rotate entire topworks counterclockwise; top-works
stem will unscrew from stem connector.
CAUTION - Unscrew straight up or stem could be bent.
6. Finish unscrewing yoke nut and lift off topworks.
7. Loosen and unscrew bonnet assembly from body.
(Fig. 16)
8. Loosen and unscrew bonnet cap and bellows
assembly from bonnet. (Fig. 17)
9. Grasp bonnet stem located immediately under
connector with sharp nose pliers and remove connector
without allowing stem to turn.
10. Remove the bellows from the bonnet cap. At times
it is necessary to cut and fish out the Teflon bellows
gasket in order to free up the bellows assembly for
removal.
Removing lnnervalve from Bellows Assembly and
Seat from Body
1. Hold stem of bellows in a lathe collet or suitable
holding device (1/8" for 1/4" valves or 3/16" for 1/2",
3/4", and 1” valves) and gently unscrew innervalve
counterclockwise using a small end wrench fitting the
flats on the innervalve. Avoid any side motion or bending.
If the bellows stem threads unscrews before the
innervalve unscrews, make a strap wrench by cutting a
strip of 80 grit emery paper the width of the bellows
length and roll about three revolutions clockwise around
the bellows assembly with the coarse side against the
bellows. Grasp the emery paper by hand and with the
wrench on the innervalve flats, remove the innervalve
from the bellows. Normally this procedure prevents
damaging the bellows because the emery paper wrapped
around the bellows gives it more support transferring
the twisting forces to where the bellows is welded to
the lower end plate.
2. Do not try to remove stem from bellows assembly.
3. Do not grasp the bellows in any manner other than
above nor allow it to twist.
4. Unscrew seat from body with a long set socket
wrench.
NOTE: If the above procedure is being done because of
bellows failure, it is not necessary to be concerned
about damage to the bellows.
Installing Bellows Seal Assembly, lnnervalve and
Seat
Generally the foregoing steps are the reverse of
disassembly, but best results will be experienced by
processing in the following sequence:
1. Screw innervalve into bellows assembly only hand
tight.
2. If the secondary packing in bonnet cap has not been
damaged, proceed; otherwise, remove old packing but
do not replace until later.
3. Place bellows-bonnet gasket carefully over bellows
to flange.
4. Insert stem into bonnet cap, carefully turning in a
clockwise direction until flange is seated all the way
into bonnet cap.
5. Be sure gasket is home and not damaged.
6. With bellows upward, carefully screw bonnet into
bonnet cap by hand until it is seated.
7. Holding bonnet in a vise, screw bonnet cap home
firmly with a wrench.
8. At this point install new secondary packing if
necessary, tightening gland firmly by finger tight as with
a standard packed valve. (See paragraph on packing.)
9. Remove from vise and hand-install connector by hand.
10. With small wrenches on connector and flats on the
innervalve, tighten firmly but prevent using any side
motion.
11. With body held in a vise as instructed, screw the
bonnet, bellows seal and innervalve assembly into the
body.
12. When body bonnet assembly is complete, the
innervalve should be off seat with the bellows in its free
state and should move approximately 1/8" when pushed
down before touching seat.
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