Flowserve Handwheels and Limit Stop - Manual (Page 2)

5-2 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
bypass valve is located between the top and bottom
cylinder ports.
2. To open the valve, turn the handwheel counter-
clockwise to retract the plug.
3. To close the valve, turn the handwheel clockwise to
extend the plug.
4. To return the valve to automatic control, return the
handwheel nut to 'neutral' as shown by the hand-
wheel position indicator and set the three-way
bypass valve to 'auto.'
5. Adjusting the handwheel nut to a position other than
neutral provides a limit stop function, either limiting
opening or closing.
Maintenance
For proper operation of the handwheel, maintain a coat
of multi-purpose lubricant on the bearings at all times.
To do this:
1. Locate the two zerk fittings on the handwheel
housing. One fitting lubricates both bearings
simultaneously.
NOTE: The screw and nut threads are permanently
Iubricated with a solid film lubricant, requiring no
additional Iubrication.
2. Check all pivot points for wear and replace worn or
damaged parts as necessary. Lubricate all pivot
points.
3. Keep screw, nut and bearings free from dirt at all
times. If dirt or grease builds up so that handwheel
operation is impaired, disassemble handwheel and
clean thoroughly.
Disassembly
To disassemble the side-mounted handwheel assem-
bly on size 25 and 50 linear actuators, refer to Figure 1.
NOTE: Because of the handwheel’s modular design,
the handwheel assembly can be removed from the
actuator without affecting the valve’s operation (unless
the handwheel is being used as a limit stop).
CAUTION: Prior to removing the handwheel unit,
ensure that the handwheel is not functioning as a
limit stop before removing the housing bolts. Fail-
ure to do so could cause serious personal injury. If
the actuator remains in service during handwheel
disassembly, keep hands and clothes away from
moving parts to avoid injury.
1. Remove four housing bolts and lift handwheel as-
sembly off the yoke.
2. Loosen the crank levers by removing two sets of
spacers, bolts and nuts fastening the levers to-
gether. Remove one retaining ring from the pivot pin
and push the pin out.
3. Remove the lock nut, handwheel and Woodruff key
from the handwheel screw shaft.
4. Remove the internal retaining ring with a pair of
internal snap-ring pliers.
5. Remove the handwheel screw shaft from the hand-
wheel nut by turning shaft clockwise (the screw has
left-hand threads). After the shaft is free from the
nut, pull the shaft and bearings straight out and
remove nut and crank levers from the housing.
6. After removing the support spacer, slide the two
bearings and support washer (sandwiched between
the bearings) off the handwheel screw shaft.
Reassembly
To reassemble the side-mounted handwheel on size 25
and 50 linear actuators:
1. Inspect all parts, especially the bearings, for dam-
age or wear; clean all parts and lubricate each
bearing.
2. Replace the bearings on the shaft in the following
order: bearing, support washer, bearing, support
spacer.
NOTE: The bearings must be oriented with the
largest inside races (thrust supporting) facing each
other, with a support washer between them (refer to
Figure 1).
CAUTION: If the bearing orientation is incorrect,
the bearings will be damaged.
3. Position the handwheel nut between the two lever
cranks and reinstall the handwheel nut into the
housing. Make sure the position indicator pin on the
nut is inserted in the position indicator slot.
4. Lubricate the small tip on the handwheel shaft and
mating hole in the housing. Reinsert the handwheel
shaft into the housing and begin turning the screw
counter-clockwise into the handwheel nut. Con-
tinue to turn until the bearings are seated in the
housing and the nut is in the neutral position.
5. Install the internal retaining ring to hold the bearings
in the housing.
6. Replace the handwheel on the shaft, making sure
the Woodruff key is properly inserted in key slot.
7. Fasten the handwheel securely in position with the
lock nut.
NOTE: If there is excessive movement ( 1 /
8
-inch or
more) when pulling on the handwheel screw, the
bearings are positioned backwards and must be
reversed (refer to Step 2) before bearing damage
occurs.
8. Lubricate and reinsert pivot pin and fasten with
retaining ring. Bolt the two sides of the crank levers
together, using two sets of spacers, bolts and nuts.
9. Reattach the handwheel assembly to the yoke
using four housing bolts. Make sure the slotted
ends of the lever cranks mate with the actuator
stem pin.