Introduction

For more than 40 years, Bettis^® has combined its ingenuity with high quality standards, continuously pioneering valve actuator technology. Beginning with the Robotarm scotch-yoke concept, Bettis^®' innovations have become today's standards for valve control in virtually every part of the world. The company operates in accordance with ISO 9001 and BS-5750 certifications and maintains a formal Total Quality Management program to assure product excellence. Continuing our innovative tradition, Bettis^® introduces the latest valve automation advancement…the G-Series Robotarm II™ quarter-turn actuator.

In developing the G-Series actuators, Bettis^® improved a basic concept - the Reaction Bar, by adding our new state-of-the-art Powr-Swivl™, replaceable bearings, highly efficient wear and corrosion resistant coating system, and tension rod compressed spring. This enhanced design greatly improves efficiency, reduces wear and extends the actuator's life. The combining of these technologies, enhancements, and superior quality control techniques produced an assembly which became the heart of our new extended service actuators - the G-Series.
  

Typical Applications

• Automation of ball, butterfly and plug valves
   

• Automation of louvers and dampers
   

• Automation of any quarter-turn mechanism

Key Features

• Wear Resistance - The G-Series Powr-Swivl 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. The Powr-Swivl, superior surface finishes, and self-lubricating bearings maximize the transfer of input energy directly to the valve stem. The tension loaded spring minimizes radial loads on the piston rod, further enhancing efficiency
   

• Service Rated - G-Series models are qualified by accelerated wearage testing. The actual service life may be predicted based upon specific application parameters and environmental conditions. Proper actuator selection, enhanced by proprietary data analysis methods, allows optimum performance and operating economy
   

• Replaceable Bearings - Low friction, permanently lubricated, high performance bearings protect sliding and rotating components, significantly extending actuator life
   

• Five Year Warranty - G-Series actuators are backed by the industry's strongest materials and workmanship warranty
   

• Corrosion Resistance - G-Series actuators incorporate protective internal and external coatings, assuring the actuator's reliable operation in the harshest of environments. The actuator exhibits excellent corrosion resistance, confirmed by Salt Spray Testing per ASTM B117 criteria. Construction features prevent water ingress, allowing G-Series actuators to meet IP 66 and IP 67M specifications and severe high pressure water deluge test
   

• Safety - The G-Series facilitates safe installation and removal of the spring module. It incorporates Bettis^®' Tension-Lok™ (patent pending) which allows for the removal of the spring module in a manner that eliminates accidental release of the spring force. Each module is tagged with detailed product information, minimizing the potential for incorrect installation, operation, or misapplication of a reconfigured actuator
   

• Versatility - The ease of interchanging the power and spring modules allows quick reversal of the "fail-safe" mode, while providing for the addition of overrides, accessories and other modules. For instance, a G-Series actuator may be easily altered from a single-acting to double-acting power cylinder configuration, and/or a hydraulic manual override may be added after the actuator has been installed
   

• True Modular Design - The G-Series versatility is punctuated by field serviceable modules. The available modules include the drive, power, spring and override. These modules are removable, serviceable and interchangeable without removing the actuator from the valve. This procedure does not require special tools or disassembly of any module. This unique feature reduces required plant shutdown time for service. Modules may be replaced as an assembly or serviced at your maintenance facility
   

• Efficient Modular Inventory - All modules may be purchased separately or in any combination. This feature allows reduced parts and spares inventory at the distribution facility, while substantially increasing the availability of different model configurations
   

• NAMUR - The shaft driven accessory interface conforms to the NAMUR standard and is identical on all G-Series actuators, allowing for standardization of accessory mounting hardware and installation practices
   

• MSS and ISO Mounting - The G-Series valve interface meets the dimensional requirements of MSS SP-101 or ISO 5211 defined for each torque range
   

• Compact - The G-Series design optimizes the center of gravity location, is significantly lighter, and requires less space than other actuators of equal or lesser torque output
   

• Operating Ranges - G-Series double-acting actuators produce guaranteed minimum torque outputs up to 6,000,000 lb-in. (678,000 Nm). The spring-return units produce spring torques in excess of 3,000,000 lb-in. (339,000 Nm). G-Series actuators are suitable for continuous operation at pneumatic pressures ranging from 40 to 200 PSIG (3 to 14 BAR), hydraulic pressures up to 5000 PSIG (345 BAR). Standard temperature range is -20°F to +200°F (-29°C to +93°C). Optional temperature ranges, as defined in item 37 of the Specification page, extend the range to -50°F or to +350°F (-46°C or to +177° C)

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