Group 31 Compact Rotary Actuators
Mechanical Features
 Motor and Drive Train:
Beck’s Group 31 compact rotary actuators
incorporate an exclusive no burnout
motor, so that on-line
dependability of valves is ensured.
Heat-treated alloy steel and
ductile iron hypocycloidal gearing
transmits torque smoothly and
powerfully to the output shaft.
The Beck-built control motor
provides millisecond response to
signal commands in a modulating
control loop—eliminating the
coasting and overshooting
problems typical of outdated
electric actuators.
The motor stator of the Group 31
drive is molded into the
centerpiece, providing stable
delivery of torque without
overheating and without burning
out.
Mechanical Stops:
Protection from Overtravel
Damage
Rugged mechanical
stops are furnished as a standard
component of the valve mounting
assembly. These stops prevent
over-travel damage to valves and limit drive travel during manual
cycling to maintain proper orientation of the drive output shaft with
respect to switches and controls. A built-in position indicator shows the
valve position.
Manual Handwheel for Convenient Local Operation:
A manual Handwheel is standard on all Group 31 models for use during
installation and testing, or during power outages. This Handwheel does
not require a declutch mechanism for operation and does not rotate
during automatic operation.
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