Introduction

Bettis^® D-Series pneumatic rack and pinion actuators provide its users with reliability and economy in valve automation. Specifically designed for quarter-turn applications, the D-Series is ideal for the on/off or continuous operation of plug, butterfly and ball valves, as well as dampers and other 90º turn devices. The D-Series actuators are compact and lightweight, making them very suitable for installation within areas of tight piping connections.  .
 

Typical Applications

• Automation of ball, butterfly and plug valves
   
• Automation of louvers and damper
   
• Automation of any quarter-turn mechanism
   

Key Features

• Splined Drive Inserts – The D-Series blowout-proof shaft is fitted with changeable inserts for universal mounting to a wide variety of valves without the need for brackets or couplings.
• Corrosion Resistance – As standard, an exclusive two-component polyurethane epoxy coating, in conjunction with a fully anodized housing and dichromated pistons, provides the D-Series actuators with a highly corrosion resistant surface. Coupled with all 304SS fasteners, the D-Series provides excellent protection from hostile environments.
• BettisGuard^TM – For the most hostile applications, BettisGuard^TM adds the highest practical level of corrosion protection by impregnating the body and end caps with a ceramic filled fluoropolymer-based epoxy resin and aluminum pinion gears (BGA). As a further option we can supply stainless steel pinion gears (BGS).
• Three-Point Suspension – D-Series pistons feature a unique three point suspension system. Each piston has three wide, machines load fingers strategically located about the rear circumference of the piston. These load fingers counteract the piston/rack side loading and prevent the natural tendency of the piston/rack to cock in the actuator bore. To accept and distribute this loading the D-Series is also equipped with a low friction Nylatron body bore bearing. The body bearing, which completely covers the working area of the piston fingers, prevents metal to metal contact and greatly reduces the high point loading often found in other designs when only slim heal bearings are used. This feature provides for longer, more dependable actuator, piston seal and bearing cycle life.
• Dual Stroke Adjustment – Allows stroke adjustment at both outbound and inbound strokes providing for precision alignment of your valves working element.
• Blowout-Proof Pinion – A unique radiused gearing design protects the pinion gear from blowouts.
• NAMUR Mounting – Allows close coupling to NAMUR designated accessories. The pinion gear interface supports a positive, international standard drive for positioners, switches and other accessories.
• Modular – The D-Series actuator can easily be converted from double-acting to spring-return configurations as well as many other options.
• Multiple-Spring Design – The D-Series has a multiple spring design to facilitate 40 to 120 psig supply air requirements. All springs are “nested” to prevent misalignment and are safely contained by a spring release bolt.

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