SMB/SB Installation and Maintenance Manual 140-11000 • July 2003 4-8
Flow Control Division
Limitorque Actuation Systems
4.5 Setting Torque Switch
The torque switch is designed to protect the actuator in open and close directions.
a WARNING: Disconnect all incoming power before working on the torque switch.
a WARNING: Do not attempt to remove either the spring cartridge cap or the housing cover from the actuator
while the valve is torque-seated.
CAUTION: Do not use abrasive cloth to clean the contacts on the torque switch.
CAUTION: A maximum stop setting plate is furnished on all actuators. Do not exceed this maximum setting without consulting
Limitorque.
4.5.1 SMB-000 Double Torque Switch
NOTE: Torque settings must be made with the switch mounted in the actuator.
Piece numbers correspond to Figure 4.3 and Table 4.5.
To set the torque switch:
1. Verify all electric power is OFF.
2. Loosen Pan Head Screws (piece #30).
3. For open or close operation, set Striker (piece #25) to the required torque setting. Match the edge of the Striker with the desired
number. The higher the number, the higher the torque output of the actuator.
4. Tighten Pan Head Screws (piece #30).
5. For torque seated valves, operate the valve electrically to seat the valve. Ensure tight shut-off by tripping the torque switch
contacts.
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