SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
4
Installation Instructions
4.1 Safety Precautions
a WARNING: Read this Installation and Maintenance Manual carefully and completely before attempting to install,
operate, or troubleshoot the Limitorque actuator.
a WARNING: Be aware of electrical hazards. Turn off incoming power before working on the actuator and before
opening the switch compartment.
a WARNING: Potential HIGH PRESSURE vessel — be aware of high-pressure hazards associated with the attached
valve or other actuated device when installing or performing maintenance on the actuator. Do not remove the
actuator mounting bolts when the actuator is mounted on a rising stem valve unless the valve is in the fully open
position and there is no pressure in the line.
a WARNING: Do not attempt to remove the spring cartridge cap, housing cover, or stem nut locknut from the
actuator while the valve or actuated device is under load.
a WARNING: Do not manually operate the actuator with devices other than the installed handwheel and declutch
lever. Using force beyond the ratings of the actuator and/or using additive force devices such as cheater bars,
wheel wrenches, pipe wrenches, or other devices on the actuator handwheel or declutch lever may cause serious
personal injury and/or damage to the actuator valve.
a WARNING: Do not exceed any design limitations or make modifications to this equipment without first
consulting Limitorque.
a WARNING: Actuators equipped with electrical devices (motors, controls) requiring field wiring must be
wired and checked for proper operation by a qualified tradesman.
a WARNING: For maintenance and/or disassembly of the actuator while installed on the valve, ensure that the
actuator is not under thrust or torque load. If the valve must be left in service, the valve stem must be locked in
such a way as to prevent any movement of the valve stem.
CAUTION: Do not use oversized motor overload heaters. Instead, look for the cause of the overload.
CAUTION: Do not operate the valve under motor operation without first setting or checking the limit switch setting
and motor direction.
CAUTION: Do not force the declutch lever into the motor operation position. The lever returns to this position
automatically when the motor is energized.
CAUTION: Do not depress the declutch lever during motor operation to stop valve travel.
4.2 Safety Practices
The following check points should be performed to maintain safe operation of the SMB or SB actuator:
• Mount the actuator with the motor in a horizontal plane, if possible.
• Keep the switch compartment clean and dry.
• Keep the valve stem clean and lubricated.
• Set up a periodic operating schedule for infrequently used valves.
• Verify all actuator wiring is in accordance with the applicable wiring diagram.
• Carefully check for correct motor rotation direction. If the valve closes when open button is pushed,
the motor leads may have to be reversed.
• Verify the stem nut is secured tightly by the locknut and that the top thread of the locknut is crimped
or staked in two places.
• Use a protective stem cover. Check valve stem travel and clearance before mounting covers on
rising stem valves.
4-1
Flow Control Division
Limitorque Actuation Systems
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