Group 31: Compact Industrial Rotary Actuator
The Harold Beck Group 31 is a compact, high-precision rotary actuator designed for quarter-turn valve automation in space-constrained industrial environments. Perfect for small ball, plug, and butterfly valves, the Group 31 delivers the same "set it and forget it" reliability as our larger drives in a streamlined footprint. By utilizing Beck’s unique no-burnout motor technology, this compact actuator eliminates the positioning drift and maintenance requirements of pneumatic systems, ensuring peak process efficiency and stability.
Housed in a precision-machined, weatherproof NEMA 4X enclosure, the Group 31 is built to last in corrosive and extreme temperature environments. It features a maintenance-free gear train and advanced digital control for easy field configuration and HART diagnostics. With its rugged construction and instantaneous response timing, the Group 31 provides a durable, energy-efficient motion control solution that maximizes facility uptime and reduces total cost of ownership for modern automated valve assemblies.
Compact Efficiency and Control Features:
- • Space-saving compact design optimized for small quarter-turn valves and dampers.
- • Continuous duty motor technology ensures 100% modulation without burnout.
- • Precision positioning with zero-backlash for superior flow and air control.
- • Maintenance-free alloy steel gearing ensures reliable long-term operation.
- • Weatherproof NEMA 4X aluminum housing for superior environmental protection.
- • Advanced digital diagnostics and HART compatibility for simplified asset management.
AVAILABLE TORQUE AND TIMING COMBINATIONS FOR THE MODEL GROUP 31
Group 31 compact rotary actuators, model 31-M50, include a single analog electronic control module which receives a 4–20 mA or 1–5 V dc input signal and provides a 4–20 mA or 1–5 V dc feedback for position control and indication.
- Electronic module has a deadband of 1.0% of span with sensitivity of 25% of deadband.
- The input signal span is nominally adjustable from 50% to 125% of the 4 V span, with the zero adjustable up to 120% of span, providing flexibility for split range operation.
Low Power Consumption
for Use with Uninterruptible
Power Supplies
The uniquely low power draw of Beck Group 31 drives permits the use of various standard uninterruptible power supplies for operationduring loss of AC power. Beck Sales Engineers can provide you with specifications on UPS equipment recommended for Beck drives.
Beck Group 31 drives equipped with feedback capability use a film potentiometer incorporated into the control module.
All modulating models feature electronic position indication. Direct AC models allow controllers to monitor drive position as the controller output directly positions the drive. Analog control modulating models provide electronic signal receiver circuitry, which compares the position indication to the control loop demand signal and provides automatic control.
DUAL FEEDBACK CAPABILITY
Models 31-M50 and 31-350 have dual feedback capability, permitting user choice of 2-wire or 4-wire field connection.
Connections for feedback selection are made in the field and need not be specified on order.
