Flowserve SMB Series Electric Actuators - Manual (Page 95)

95
SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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8.5 SB-3
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.
The SB-3 actuator is a basic SMB-3 actuator with the housing cover, drive sleeve, and locknut modi-
fied to provide spring compression to the stem nut. The disassembly/assembly procedure for the
SMB-3 is applicable (Sections 7.3.1, SMB-0, 1, 2, 3 and 4 Disassembly and Section 7.3.3, SMB-0,
1, 2, 3 and 4 Reassembly), with the following procedures replacing Step 11 and stem nut removal
procedure.
8.5.1 SB-3 Disassembly/Stem Nut Removal
Piece numbers refer to Figure 8.5.
1. Remove the Spring Housing (piece #140).
2. Remove the Spring Cartridge (piece #149), complete with Belleville Springs (piece #152), Thrust
Washers (pieces #150, 153), Deflection Limit Sleeve (piece #161), and Spring Retainer Cap
(piece #166).
NOTE: The spring assembly should not be disassembled unless absolutely necessary.
To disassemble the Spring Cartridge:
a. Remove the Spring Retainer Cap (piece #166). Be careful to remove the set screws securing
the Spring Retainer Cap to the Spring Cartridge before trying to remove Spring Retainer Cap .
b. Lift off Thrust Washer (piece #150), Belleville Springs (piece #152), Deflection Limit Sleeve
(piece #161) and Thrust Washer (piece #153).
To reassemble the Spring Cartridge:
a. Position Belleville Springs (piece #152) between the two Thrust Washers (pieces #153 and
#150) as shown in Figure 8.5.
b. Thread the Spring Retainer Cap (piece #166) onto the Spring Cartridge (piece #149) until the
Spring Retainer Cap touches the Thrust Washer. Add 3/4 turn.
c. Reinstall set screws or drill and tap for new set screw locations.
d. Install Deflection Limit Sleeve (piece #161).
3. Remove the Bearing Cartridge (piece #154), complete with Bearing Cup and Cone (pieces #147
and #148).
4. Remove Centering Ring (piece #167) and the Drive Sleeve Bearing Cartridge (piece #3).
5. Remove Drive Sleeve (piece #11) in accordance with Step 12 of Section 7.3.1, SMB-0, 1, 2, 3 and
4 Disassembly. If only the Stem Nut (piece #20) is to be removed, see Step 6.