Bettis CBB420 Pneumatic Actuator

Bettis CBB420 Pneumatic Actuator

The Bettis CBB420 is a high-performance double-acting pneumatic scotch-yoke actuator designed for reliable and efficient automation of quarter-turn valves. Engineered with a rugged housing and a mechanically optimized yoke mechanism, the CBB420 delivers high break torque, stable operating characteristics, and long service life even in demanding industrial environments.

This actuator is part of the Bettis CBB-Series, known for its robust construction, compact footprint, and flexible configuration options. The CBB420 is suitable for a wide range of applications, including ball, butterfly, and plug valve automation in oil and gas, petrochemical, power generation, and general industrial service. Its double-acting design ensures precise, bidirectional control with consistent torque output throughout the stroke.

Technical Specifications — Bettis CBB420

Actuator Type

• Pneumatic quarter-turn actuator

• Double-Acting (DA) configuration

• Scotch-yoke mechanism for enhanced torque output

• Model Size: CBB420

Performance

Cylinder Volumes

• Outboard volume: 53 in³ (approx. 868 cm³)

• Inboard volume: 115 in³ (approx. 1885 cm³)

Pressure Ratings

• Maximum Operating Pressure (MOP): 120 psig (8.3 bar)

• Maximum Allowable Working Pressure (MAWP): 200 psig (13.8 bar)

Torque Characteristics

• High break torque due to scotch-yoke geometry

• Stable torque profile across 90° rotation

• Suitable for valves requiring high unseating force

Construction & Materials

• Housing available in ductile iron or carbon steel

• Heavy-duty scotch-yoke mechanism for long-term durability

• Precision-machined internal surfaces for smooth operation

• Designed for harsh process environments and industrial duty cycles

Dimensions (Double-Acting Configuration)

• Overall Length (A): ~16.43 in

• Height (B): ~8.57 in

• Drive Housing Width (C): ~4.25 in

• Pressure Port Size: 3/8 in. NPT

• Mounting Thread (P): 3/8-16 UNC

• Output Shaft Square (N): 3.00 in

(Dimensions may vary slightly depending on selected housing material and accessories.)

Weight

• Ductile iron version: approx. 12.5 kg

• Carbon steel version: approx. 13.1 kg

Operating Characteristics

• 90° rotary motion for quarter-turn valves

• Bidirectional torque output

• Suitable for horizontal or vertical installation

• Compatible with accessories such as limit switches, positioners, and manual overrides

Applications

• Ball valves

• Butterfly valves

• Plug valves

• On/off automation

• Process isolation

• Oil & gas, petrochemical, refining, chemical, and power industries