Flowserve SMB Series Electric Actuators - Manual (Page 39)

39
SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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7
SMB Disassembly
and Reassembly
NOTE: For explosion proof applications, brush-apply a thin coating of Mobil Infinitec 152 or
equivalent grease to the flanged surfaces of the gear housing and mating limit switch compartment
cover. Remove excess grease after bolting the cover in place. Mobil Infinitec 152 is a synthetic
automotive wheel bearing grease that is resistant to high temperatures and water wash-out.
7.1 SMB-000
c WARNING: See Section 4.1 and 4.2 on Safety Precautions and Safety Practices before
proceeding with disassembly.
7.1.1 To Replace the Stem Nut Only
c WARNING: Do not remove the Locknut (piece #30) with actuator under load or with the valve
under pressure.
a CAUTION: If valve must be left in service while the stem nut is replaced, the valve stem must be
locked in such a way as to prevent any movement of the valve stem.
1. Remove 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 Stem Nut (piece #11) 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 #5) to close the valve.
4. When the stem nut splines are free from the Drive Sleeve (piece #8), the Stem Nut may be
rotated by hand for the remainder of the length of the valve stem and replaced, if necessary.