Flowserve SR Series Limitorque - Manual (Page 8)

Limitorque SR Series FCD LMENIM3701-00-AQ - 11/14
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2.6.1 Installing a Gearbox with a Threaded Stem Nut – SR200 through
SR600 and SR200H through SR600H
1. Position the gearbox above the valve stem.
2. Rotate the gearbox handwheel or wrench nut several turns until there is positive engagement between the valve stem and the
gearbox Stem Nut.
3. Rotate the handwheel to lower the gearbox onto the valve until contact has been made with the valve flange.
4. Bolt the gearbox securely to the valve mounting flange.
2.6.2 Installing a Gearbox with a Blank Stem Nut – SR200 through SR600
Refer to Figure 5.1
1. Remove the Stem Cover Adapter (pc# 28) by loosening the Set Screw (pc# 20).
2. Remove the two threaded Lock Nuts (pc# 7) from the Drive Sleeve (pc# 6), accessed through the top of the Housing (pc# 1).
3. Remove the Stem Nut (pc# 5) from the Drive Sleeve (pc# 6) through the top of the Housing (pc# 1).
4. Machine the Stem Nut (pc# 5) to suit the valve stem.
a CAUTION: Care must be taken to ensure that the clamping devices used during machining do not damage splined surfaces of the Stem Nut.
5. Reinstall the Stem Nut (pc# 5) into the Drive Sleeve (pc# 6), ensuring the splines are properly engaged.
6. Reinstall the two threaded Lock Nuts (pc# 7) into the Drive Sleeve (pc# 6).
7. Install the Stem Cover Adapter (pc# 28) and tighten the Set Screw (pc# 20).
8. Mount the gearbox on the valve as detailed in Section 2.6.1 Installing a Gearbox with a Threaded Stem Nut.
2.6.3 Installing a Gearbox with a Blank Stem Nut – SR200H through SR600H
Refer to Figure 5.2
1. Place the gearbox upside down to access the mounting base.
2. Remove the Socket Head Cap Screws (pc# 34) which mount the Thrust Base (pc# 31) to the Thrust Housing (pc# 37).
3. Remove the Thrust Base (pc# 31) and Gasket (pc# 32) from the Thrust Housing (pc# 37).
a CAUTION: Care must be taken to ensure that the O-ring (pc# 35) located in the Thrust Base (pc# 31) is not damaged during disassembly.
4. Remove the Stem Nut (pc# 5) and lower Thrust Roller Bearing (pc# 33).
5. Remove the upper Thrust Roller Bearing (pc# 33). Place all bearings in a clean, dry area until reassembly.
6. Machine the Stem Nut (pc# 5) to suit the valve stem.
a CAUTION: Care must be taken to ensure that the clamping devices used during machining do not damage the outer surface of the
Stem Nut (pc# 5) which seals against the O-ring (pc# 35).
7. Reinstall the upper Thrust Roller Bearing (pc# 33) into the Thrust Housing (pc# 37).