Flowserve SMB Series Electric Actuators - Manual (Page 47)

47
SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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a CAUTION: If valve must be left in service while the stem nut is replaced, the valve stem nut must
be locked in such a way as to prevent any movement of the valve stem.
1. Remove the Locknut (piece #30). The locknut is staked in two places; locate the stakes and spot
with a drill.
2. Clean all metal particles.
3. Lift the Stem Nut (piece #8) out of the top of the actuator.
If the actuator is mounted on a valve having a threaded stem, and stem nut removal is required,
proceed as follows:
1. Remove the Locknut (piece #30).
2. Declutch actuator for manual operation
3. Rotate the Handwheel (piece #89/99) to close the valve.
4. When the stem nut splines are free from the Drive Sleeve (piece #4), the Stem Nut may be
rotated by hand for the remainder of the length of the valve stem and replaced, if necessary.
To re-install the Stem Nut onto the Keyed Shaft:
1. Lower the Stem Nut into the Drive Sleeve, aligning the splines, until the Stem Nut is seated.
2. Install the Key.
3. Install the Locknut.
4. Stake in two (2) places, 180° apart.
To reinstall the Stem Nut onto a Threaded Shaft:
1. Rotate the Stem Nut on the shaft until the Stem Nut splines engage the Drive Sleeve splines.
2. Rotate the Handwheel to open the valve until the Stem Nut is seated.
3. Install the Locknut .
4. Stake the top threads in two (2) places, 180° apart.
7.2.2 SMB-00 Disassembly
Piece numbers refer to Figure 7.4 to 7.7.
1. Verify power to the actuator is OFF.
2. Remove or swing open the Limit Switch Compartment Cover (piece #2).
3. Disconnect the leads of the Geared Limit Switch (piece #85) leads and the Torque Switch (piece
#83). Verify the leads are marked for reconnecting to the terminals.
4. Remove the two screws each on the Geared Limit Switch and the Torque Switch. Remove the
Geared Limit Switch and the Torque Switch.
5. Remove the motor leads from the Motor Terminal (piece #77) inside the limit switch compart-
ment. Remove the Motor Assembly (piece #84) and guide the motor leads through the conduit
opening.
NOTE: The Motor Pinion (piece #20) is keyed to the motor shaft and held there with a set screw to
retain the pinion in its proper position.
6. Verify actuator is in motor operation in order to unload tripper level (piece #10) assembly.