SMB/SB Installation and Maintenance Manual 140-11000 • July 2003 8-1
Flow Control Division
Limitorque Actuation Systems
8 SB Disassembly and Reassembly
a WARNING: See Section 4.1 and 4.2 on Safety Precautions and Safety Practices before proceeding with
disassembly.
a WARNING: Extreme caution should be used in the disassembly and reassembly of the spring compensator
assembly.
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 7.2.1, SMB-00
Disassembly and Section 7.2.2, 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.
NOTE: Note the arrangement of the Belleville Springs.
4. If the actuator is mounted on the valve, place the actuator in manual operation. Rotate the Handwheel (piece #99) in the direction
to effect a downward movement of the stem (usually the closed direction) until the compensator Ball Bearing (piece #81)
stops rising.
5. Lift out the Thrust Adapter Sleeve (piece #120), and Bearing (piece #81).
6. If the actuator is not on a valve, the Stem Nut (piece #8) will lift out.
7. Remove Bevel Gear Housing (piece #96) as an assembly complete with side-mounted handwheel assembly.
8. To remove Drive Sleeve Assembly, proceed as in Section 7.2.1, SMB-00 Disassembly.
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