PFMM-WFI-99 - Pure-Flo

8. Open valve and check bonnet nuts to ensure
they are evenly tightened.
9. If diaphragm leaks at body/bonnet joint after
reaching temperature and pressure,
depressurize system and re-tighten nuts in
accordance with Section 1.0.2.
3.5 LUBRICATION
CAUTION!
Standard lubricant is Chevron Poly FM2.
Contact ITT Industries for evaluation of nonstandard
lubricants.
ATTENTION !
Utiliser le lubrifiant standard Chevron Poly FM2.
Pour obtenir une évaluation des lubrifiants non
standard, contacter ITT Industries.
3.5.1 Bonnets are not equipped with grease
fittings and must be disassembled to be
lubricated. Under normal operations,
lubrication is not necessary.
3.5.2 Where valves are exposed to corrosive
atmospheres or weather conditions,
contacting surfaces of the handwheel and
bonnet shell should be lubricated.
3.6 O-RING REPLACEMENT (Fig. 2)
CAUTION!
Do not attempt to close the valve when the
bonnet is removed from the body and the travel
stop nut is not in position for models with a
potentiometer gear. Potential damage to the
potentiometer may result.
ATTENTION !
Sur les modèles avec engrenage pour
potentiomètre, ne pas essayer de fermer la
vanne si le chapeau du boîtier a été enlevé et
l’écrou limiteur de course n’est pas en place,
car le potentiomètre risquerait d’être
endommagé.
1. Remove bonnet nuts and lift the bonnet from
the body. Remove clear plastic cap and
travel stop nut.
2. Loosen handwheel set screw and remove
handwheel from bushing.
3. Unthread the upper cover. Remove o-ring
from bushing.
4. If the unit has a potentiometer, mark the
hub/potentiometer gears to maintain
alignment during reassembly. Use care not
to cause the potentiometer gear to rotate,
loosen set screw in hub, lift hub from
bushing.
6
5. Remove diaphragm/spindle/bushing
assembly by withdrawing through bottom of
bonnet. Remove the lower cover from the
bonnet by lifting straight up off the pins. Note
the conduit location prior to removal.
6. Remove o-ring from grooves in bushing
outside diameter.
7. Unscrew diaphragm/spindle assembly from
handwheel bushing.
8. Remove o-ring from groove in spindle
outside diameter.
9. Lubricate thrust bearing or washer in
accordance with Section 3.5. Install on
shoulder of bushing.
10. Select correct size o-rings (figure 2).
Lubricate new o-rings in accordance with
Section 3.5 and insert into grooves in
bushing and spindle. Do not insert the
bushing top o-ring.
11. Screw diaphragm/spindle assembly into
bushing.
12. Install diaphragm/spindle/bushing assembly
into bonnet and lower cover. Slide the hub
and shim washer down the bushing with the
set screw in line with the counterbore for the
handwheel set screw. Establish a 0.005"
clearance between the bottom of hub and
shim resting on lower cover boss and lock in
place. If the unit has a potentiometer, be
sure the hub/potentiometer gear marks align.
Assemble the bushing top o-ring and
lubricate. Thread on the upper cover.
13. Verify shim washer is installed. Install
handwheel and tighten set screw, ensuring
end of set screw engages hole in bushing.
14. Screw cap with o-ring onto bushing hand
tight.
3.7 CHANGE DIAPHRAGM TYPE
To change from an elastomer diaphragm to
PTFE, the compressor must be changed,
and a tube nut must be installed.
1. Follow procedure 3.6, steps 1-5.
2. Drive out the spring pin which retains the
compressor.
3. Install tube nut into hexagonal hole in new
compressor. Locate the new compressor
on the spindle and drive in the spring pin.
To change from a PTFE diaphragm to
elastomer, the compressor must be
changed. The procedure is the same as
above, except a tube nut is not required.