Overview
The Bettis 118235 (RP 450 DAG CW DA) is a 120PSI-rated pneumatic valve actuator manufactured by Bettis, an Emerson Electric division. Designed for quarter-turn applications, this double-acting scotch-yoke actuator automates ball, butterfly, plug, and damper mechanisms in industrial valve control systems. The RP 450 configuration delivers reliable torque output across pressurized systems while maintaining the modular design philosophy that Bettis is known for in process control automation.
Key Features
- Double-Acting Design: Provides equal force in both opening and closing directions for balanced control without spring assistance
- 120 PSI Maximum Pressure Rating: Operates efficiently across standard industrial pneumatic systems
- Clockwise Rotation (CW): Configured for clockwise quarter-turn operation with 0°-90° stroke
- Scotch-Yoke Mechanism: Proven design delivers consistent torque output at both start and end positions
- Modular Construction: Allows field maintenance, reduces wear, and simplifies spare parts inventory
- Industrial-Grade Durability: Engineered for reliable operation in challenging process environments
Technical Specifications
The following specifications are derived from Bettis RP 450 series documentation:
- Model: RP 450 DAG CW DA
- Manufacturer Part Number: 118235
- Maximum Operating Pressure: 120 PSI
- Actuator Type: Double-Acting Pneumatic
- Rotation Direction: Clockwise (CW)
- Stroke Range: 0° to 90° (quarter-turn)
- Design Philosophy: Scotch-yoke valve automation
- Typical Applications: Ball valves, butterfly valves, plug valves, louvers, dampers
- Standard Operating Temperature Range: −20°F to +200°F (−29°C to +93°C)
- Optional Temperature Range: −40°F to +350°F (−40°C to +177°C)
Typical Applications
Bettis 118235 actuators are commonly deployed in:
- Process Control Systems: Automated isolation and flow control in oil, gas, chemical, and refining operations
- HVAC & Building Systems: Damper control and valve automation in large commercial and industrial facilities
- Power Generation: Valve actuation in steam, fossil fuel, and renewable energy plants
- Water Treatment: Reliable quarter-turn automation for isolation, bypass, and distribution valves
- General Pneumatic Automation: Any application requiring 120 PSI double-acting torque output for quarter-turn ball, butterfly, or plug valves
Compatibility & Replacements
Compatible With
- Standard pneumatic supply systems rated at 120 PSI nominal operating pressure
- Manual and automated ball, butterfly, and plug valve operators
- Solenoid valve positioners and air signal control systems
- Bettis auxiliary equipment: hydraulic override systems, limit switches, and manual overrides
- Industrial control platforms and Safety Instrumented Systems (SIS)
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator or Emerson technical support before ordering replacement units. Bettis 118235 is the specific model designation; confirm part number match with your original equipment documentation to ensure proper fit and performance.
Works With
- Pneumatic pressure regulators and air supply networks
- Solenoid directional control valves
- Limit switches and valve position indicators
- Bettis M11 and M11D Hydraulic Override Systems
- Manual lever overrides and emergency fail-safe spring cartridges
- Industrial fieldbus and analog control signals in automated systems
