Flowserve SMB Series Electric Actuators - Manual (Page 20)

SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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4.5 Setting Torque Switch
The torque switch is designed to protect the actuator in open and close directions.
c WARNING: Disconnect all incoming power before working on the torque switch.
c WARNING: Do not attempt to remove either the spring cartridge cap or the housing cover from
the actuator while the valve is torque-seated.
a CAUTION: Do not use abrasive cloth to clean the contacts on the torque switch.
a CAUTION: A maximum stop setting plate is furnished on all actuators. Do not exceed this
maximum setting without consulting Limitorque.
NOTE: See Section 4.3.3 for wiring connection requirements.
4.5.1 SMB-000 “Cam Style” Double Torque Switch
NOTE: Torque settings must be made with the switch mounted in the actuator.
Piece numbers correspond to Figure 4.4 and Table 4.6.
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.