Flowserve LY Series Limitorque - Manual (Page 13)

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11
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2. If Torque Nut has been bored and keywayed by Limitorque, verify dimensions and keyway location
for proper compatibility with the valve stem.
3. If Torque Nut has not been bored and keywayed by Limitorque, it is provided solid (blank) to allow
customer to custom key and bore up to the maximum permissible sizes as listed in Table 5.1.
Table 5.1 – Mounting Base Dimensions
Unit Type and Size
Maximum Bore
inch (mm)
Maximum Keyway
inch (mm)
LY 1001 1-1/8, dia (28 dia) 1/4 x 1/8, (6 x 3)
LY 2001/3001 2-3/8, dia (60 dia) 5/8 x 1/16 (15 x 7.5)
NOTE: Before keywaying, match the Torque Nut with the Valve Stem to ensure proper keyway location. Use the
Keyway Index Mark (LY 1001 only) for locating appropriate keyway location.
Figure 5.2 – LY Keyway Locations
A B
C D
LY 1001 Keyway
Location Marks
D
A
B
C
Torque Nut
Stop Lug
LY 2001/3001 Keyway
Location Positions