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ETWeb

Email: etweb@curtisswright.com
Phone: +1.714.528.2301

Bettis

Since the earlier half of the 20th century, Bettis has stood at the forefront of the actuation industry. Its actuators are installed in almost every energy related industry including power generation, oil and gas transmission, and refining.

Bettis has been supplying actuators to the worldwide nuclear power industry since 1969, and boasts over 7,000 pneumatic actuator installations in the U.S. nuclear power industry alone.

Bettis manufactures a complete line of actuators including linear, rack and pinion, and quarter-turn scotch yoke. These actuators are available in spring return and double acting configurations and provide one of the widest ranges of torques and thrusts in the industry.

In 1984, Bettis and Curtiss-Wright Nuclear formed a relationship to provide increased support and service to the Nuclear Power Industry. Bettis actuators can be supplied commercial grade, safety-related, or with full IEEE qualification.

CBB-Series

Bettis CBB-Series pneumatic actuators are compact, lightweight and ideally suited for automating ball, butterfly and non-lubricated plug valves, or any quarter-turn (90 degree) rotating mechanism.

These economical, low maintenance actuators provide a reliable means of automation and are available in double-acting and spring-return models with optional features and controls to meet most actuation needs.

Key Features and Benefits

Totally enclosed body	Provides complete protection of internal moving parts/minimizes chance of injury to operating personnel Excellent water ingress protection and enhanced corrosion protection
Center bar	Excellent piston guidance throughout full stroke, ensuring piston never contacts cylinder wall
Scotch-yoke mechanism	Provides optimum break torque Simple to maintain and service

Principles of Operation

Bettis CBB-Series pneumatic actuators are equipped with a scotch and yoke mechanism that transforms linear movement of the piston into a 90 degree rotating movement. The design provides optimum break torque in a package that is simple to maintain and service.

Made of high strength alloy steel, the center bar guides the piston throughout its full stroke, ensuring that it never comes into contact with the cylinder wall.

Other enhanced features include external field adjustable bi-directional travel stops that are provided as an integral part of the actuator to ensure precise valve travel and protect the valve stem from excess torque.

General Specifications

Minimum Output Torque / Standard Operating Pressure:	Double Acting up to 11,561 lb-in / 40 to 80 PSIG Spring Return up to 4,561 lb-in / 40 to 120 PSIG
Trim Construction:	Various trim construction available for continuous operation from -12°F to 350 °F
Quality Class:	Commercial Safety-Related IEEE Qualified

Plant Design

PWR, BWR, CANDU

Typical Plant Applications

Condensate
Condensate Polishing
Boric Acid
Component Cooling Water
Service Water
Steam Generator Blowdown
HVAC
CVCS
Decay Heat Removal
Drywell Sump Floor Drain
ECCS
Off-Gas System
Containment Purge
Spent Fuel Pool

G-Series

The Bettis G-Series actuator is a premium product, with rugged components for long life in an efficient, space saving package.

The G-Series provides a unique, highly reliable means of operating ball, butterfly or plug valves, as well as louvers, dampers and other 90-degree rotating mechanism. The actuator is available in double-acting and spring-return models with optional features and controls to meet minimum torque requirements.

Key Features and Benefits

True Modular Design	Modules are removable, serviceable and interchangeable without removing the actuator from the valve Minimizes plant shutdown time for service Provides maximum safety
Efficient Modular Inventory	Reduces parts and spares inventory at the distribution facility Increases the availability of different model configurations
Power-Swivel Piston Rod	Provides high corrosion and wear resistance connection
Replaceable Bearings:	Extends actuator life significantly by using low friction, permanently lubricated high performance bearings
Compact Design	Optimizes center of gravity location Significantly lighter than other actuators

Principles of Operation

Bettis G-Series pneumatic actuators are equipped with scotch and yoke mechanism that transforms linear movement of the piston into a 90 degree rotating movement. The design provides greater torque at the beginning and the end of each stroke of the piston, precisely where it is required to operate most types of valves.

The G-Series is developed on a basic concept by adding the Reaction Bar, the new Power-Swivel, replaceable bearings, highly efficient wear and corrosion resistant coating system, and a tension rod compressed spring. The Power-Swivel connects the piston rod and the guide blocks, compensating for side load deflection, thus reducing wear on the rod, bearings and seals (not available on G1 models). The Power-Swivel piston rod connection is contained by the guide block, which is supported by a high strength alloy steel reaction bar treated to provide a highly corrosion and wear resistant finish.

General Specifications

Minimum Output Torque:	Double Acting from 12,581 lb-in to 6,000,000 lb-in Spring Return in excess of 3,000,000 lb-in
Maximum Pressure:	The G-Series operates at pneumatic pressures from 40-2000 PSIG
Performance:	Standard Temperature Range: -20°F to +200°F Optional low temperature trim allows continuous operation from -50°F to +180°F Optional high temperature trim provides operational capabilities from 0°F to +350°F
Quality Class:	Commercial Safety-Related

Plant Design

PWR, BWR, CANDU

Typical Plant Applications

Components Cooling Water
Service Water System
Containment Purge/Vent

HD/T-Series

Bettis HD/T-Series pneumatic actuators are designed for Heavy Duty Service, and provide a practical and reliable method for opening and closing valves by remote control without the need for expensive and unnecessary gearing, hydraulic pumps or other motor driven devices.

They are ideally suited for automating ball, butterfly, plug valves, or any quarter-turn (90 degree) rotating mechanism. The HD/T-Series actuators are available in double-acting and spring-return models with optional features and controls to meet minimum torque requirements.

Key Features and Benefits

Totally enclosed housing	Provides complete protection of internal moving parts/minimizes chance of injury to operating personnel Minimizes the possibility of component misalignment
Scotch-yoke mechanism	Provides optimum break torque and maintenance simplicity
Pressure Energized	Provide exceptional service life and minimizes cylinder wear

Principles of Operation

The Bettis HD/T-Series pneumatic actuators are equipped with scotch and yoke mechanism that transforms linear movement of the piston into a 90 degree rotating movement. The design provides greater torque at the beginning and the end of each stroke of the piston, precisely where it is required to operate most types of valves.

The T-Series, a larger heavy-duty actuator, incorporates two internal cylinder tie bars, which guide the piston as it delivers thrust to the yoke. Other enhanced features consists of external field adjustable bi-directional travel stops that are provided as an integral part of the actuator to ensure precise valve travel and protect the valve stem from excess torque.

General Specifications

Minimum Output Torque:	Double Acting up to 50,331 lb-in Spring Return up to 18,044 lb-in
Maximum Pressure: (standard operating pressure for T-Series)	The HD-Series operates at pneumatic pressures up to 250 PSIG (17 BAR)
Minimum Output Torque	Double Acting up to 450,000 lb-in / 40 to 80 PSIG Spring Return up to 210,000 lb-in / 40 to 120 PSIG
Performance:	Various trim construction are available for continuous operation from -20° F to +200° F Optional low temperature trim allows continuous operation from -50°F to +150° F Optional high temperature trim provides operational capabilities from 0 °F to +350°F
Quality Class:	Commercial Safety-Related

Plant Design

PWR, BWR, CANDU

Typical Plant Applications

Condensate
Condensate Polishing
Boric Acid
Component Cooling Water
Service Water
Steam Generator Blowdown
HVAC
CVCS
Decay Heat Removal
Drywell Sump Floor Drain
ECCS
Off-Gas System
Containment Purge
Spent Fuel Pool

Available Bettis Products

CBB-Series – Scotch-Yoke Pneumatic Actuator
CB-Series - Scotch-Yoke Pneumatic Actuator
D-Series – Rack and Pinion Pneumatic Actuators
E-Series – Quarter Turn Pneumatic Actuators
HD/T-Series – Balanced Scotch-Yoke Pneumatic Actuators
G-Series – Scotch-Yoke Pneumatic Actuators
Controls and Accessories
- Linebreak Systems
- Pressure Pilot Valves
- BettiSwitch II