Flowserve SMB Series Electric Actuators - Manual (Page 96)

SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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6. If the actuator is not on the valve, the Stem Nut (piece #20) is accessible. If the actuator is on the
valve, bolt the Drive Sleeve Bearing Cartridge (piece #3) to the Housing (piece #2) using two 7 ⁄
8
"
UNC x 9 UNC x 11/2" long bolts to hold the Bearing Cone and Cup (pieces #77 and 78) in place.
a. Place the actuator in hand operation.
b. Rotate the Handwheel in the direction to effect a downward movement of the stem—usually
the close direction. The Stem Nut will climb up the stem until it clears its splines.
c. Rotate the Stem Nut off the stem.
8.5.2 SB-3 Reassembly/Stem Nut Installation
Piece numbers refer to Figure 8.5.
1. Replace the Stem Nut (piece #20).
a. If the actuator is not on the valve, the Stem Nut will drop in the Drive Sleeve (piece #11) until it
bottoms out on the shoulder of the Drive Sleeve. Ensure splines are engaged.
b. If the actuator is mounted on the valve, thread the Stem Nut (piece #20) down the stem until
the splines hit. Put the actuator in manual operation. Rotate the Handwheel in the direction to
move the stem upward—usually the open direction. The Stem Nut will lower as the Handwheel
turns, until it bottoms out on the shoulder in the Drive Sleeve and the stem starts to move up.
2. Replace the Bearing Cartridge (piece #154) and the Bearing Cup and Cone (pieces #147, 148).
Ensure Quad Ring (piece #168) and O-Ring (piece #163) are properly installed. Ensure the
Bearing Cartridge engages the splines on the top of the Stem Nut—the Bearing Cartridge will not
rotate if engaged properly.
3. Replace the Centering Ring (piece #167).
4. Replace the Spring Cartridge (piece #149) as an assembly along with the Belleville Springs (piece
#152), Thrust Washers (pieces #150, 153), and Spring Retainer Cap (piece #166).
5. Replace the Deflection Limit Sleeve (piece #161).
6. Verify that the O-Ring (piece #160) is properly installed in the Spring Retainer Cap (piece #166).
Install the Spring Housing (piece #140), adding a gasket for sufficient thickness to fill in the gap
“a,” making an allowance for the gasket material compressibility.