Flowserve Handwheels and Limit Stop - Manual (Page 7)

Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 5-7
2. Remove the handwheel cap and the handwheel cap
extension.
3. Loosen stem clamp and slide it off actuator stem.
4. Use a wrench on the actuator stem flats to secure
the position of the stem so it cannot rotate. Remove
the stem locknut.
CAUTION: Damage to the seating surfaces of
the plug and seat can result if the plug is allowed
to rotate during removal of the stem locknut.
5. Unbolt gear operator from pedestal.
NOTE: Bolts are located on the pedestal under-
neath the gear operator. They are not the bolts
located at the top portion of the gear operator itself.
6. Lift off the gear operator, drive nut assembly and
handwheel screw.
7. Unbolt pedestal from the cylinder actuator. This will
relieve spring tension in the actuator (air-to-open
only).
WARNING: Cylinder is spring loaded. Do not
attempt to remove the handwheel pedestal bolts
without following Step 8 exactly. Failure to do
so can cause serious injury.
8. Remove the six pedestal bolts gradually to relieve
spring tension. This can be done by loosening the
first bolt approximately one-quarter turn, then loos-
ening the bolt directly opposite one-quarter turn
until all bolts have been loosened and the spring
tension is relieved.
NOTE: The bolts are long enough to relieve all
spring tension prior to removing the pedestal.
9. Remove the pedestal.
10. Lift out the spring button and spacer if provided (air-
to-open only).
11. Remove cylinder retaining ring.
12. Disassemble cylinder from yoke.
13. Remove spring and spring button.
14. Lift out piston, actuator stem and handwheel stem
assembly.
CAUTION: Unless the piston stem O-ring (seal-
ing the two cylinder air chambers) is leaking, do
not remove the handwheel stem from the actua-
tor stem. It may be difficult to realign the stem
pin hole while reassembling the handwheel stem.
15. Remove piston, yoke, and pedestal O-rings.
Reassembly
Refer to Figure 3:
1. Make sure all internal parts are thoroughly cleaned
and lubricated before beginning assembly. Use
new O-rings and gaskets. (O-rings should be lubri-
cated with a silicone lubricant such as Dow Corning
55M or equivalent).
2. Reassemble the cylinder actuator using the appro-
priate actuator maintenance bulletin.
3. Place the gasket on the cylinder. Place the pedestal
on top of the cylinder. Pedestal should align with
spring button or spring button spacer if used.
NOTE: Check bolting alignment for proper hand-
wheel orientation.
4. Replace aluminum flat washers.
NOTE: To prevent air leaks, lightly coat the wash-
ers with a standard pipe sealant.
5. Reassemble pedestal bolts. Begin tightening the
bolting in a manner that will keep the pedestal
square with the cylinder.
WARNING: Failure to keep the pedestal square
with the cylinder may result in damage to the
pedestal O-ring and bushing.
6. Tighten the first bolt approximately one-quarter turn,
then tighten the bolt directly opposite one-quarter
turn. Continue tightening until sufficient gasket com-
pression is applied to seal cylinder and pedestal
tightly. This is necessary to prevent air leakage.
7. Before applying air to the cylinder, make sure the
cylinder retaining ring is installed properly. Feed air
to bottom of cylinder to raise handwheel stem (air-
to-open only).
8. Insert round end key into slot in handwheel stem.
Remove air. Handwheel stem will retract (air-to-
open only).
9. Place gear operator on flat surface with top of the
operator facing down. Insert key in gear operator
drive nut. Install one set of roller thrust bearings in
gear operator.
10. Align the key to the bevel gear key way and install
drive nut. Install second set of roller thrust bearings.
11. Lubricate handwheel screw, and then screw (screw
is left-hand threaded) into the drive nut until screw
bottoms out.
CAUTION: Before completing the next step, be
sure not to allow assembled portion of the
handwheel to drop out of the gear operator.
Failure to do so will cause the drive nut key to
drop out of place. Steps 9 and 10 will then have
to be repeated.
12. Install pedestal gasket.
13. Take the gear operator and handwheel screw as-
sembly and insert it on handwheel stem while
aligning stem key with slot in handwheel screw.
Make sure gear operator is flush with pedestal top.
14. Once the gear operator is flush with the pedestal,
replace bolts and tighten. Tighten the first bolt one-
quarter turn, then tighten the bolt directly opposite
one-quarter turn. Continue tightening all bolting
until gear operator and pedestal are firmly seated.
15. Install lock nut on handwheel stem, and screw on
handwheel cap extension.
16. Insert gaskets and cap liner (sight glass) into hand-
wheel cap.