Flowserve SMB Series Electric Actuators - Manual (Page 80)

SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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8
SB Disassembly and Reassembly
c WARNING: See Section 4.1 and 4.2 on Safety Precautions and Safety Practices before
proceeding with disassembly.
c WARNING: Extreme caution should be used in the disassembly and reassembly of the spring
compensator assembly. The compensator springs may be compressed (under load) even though
the line pressure has been removed from the valve and power is disconnected. Be sure that the
spring compensator indicator in the Spring Housing points to zero before beginning disassembly.
Remove the Spring Housing bolts by turning each bolt in order around the housing no more than
1/4 turn at a time.
8.1 SB-00
The SB-00 actuator is a basic SMB-00 actuator with the housing cover, drive sleeve and locknut
modified to provide spring compression to the stem nut. The disassembly/reassembly procedure
for the SMB-00 is applicable (Sections 7.2.2, SMB-00 Disassembly and Section 7.2.3, SMB-00
Reassembly, with the following procedures replacing Step No. 13 and the stem nut removal
procedure.
8.1.1 SB-00 Disassembly/Stem Nut Removal
Piece numbers refer to Figure 8.1.
1. Remove Spring Housing Cover (piece #121).
2. Remove Locking Nut (piece #125). Note that the Set Screw (piece #126) must be loosened
before the Locknut can be removed.
3. Lift the Spring Cartridge (piece #123). Try to keep cartridge straight to aid in its removal. The
Belleville Springs (piece #108), Thrust Washer (piece #124), and Thrust Limiter Sleeve (piece
#119) (where applicable) will come out with the Spring Cartridge.