Bettis D-Series_Rack Pinion Pneumatic Actuators
Application and Features
• Splined Drive Inserts – The D-Series blow-out proof drive shaft is fitted with changeable inserts for universal mounting to a wide variety of valve stems without the need for brackets or couplings.
• Corrosion Resistance – As standard, a polyester TGIC-free powder coated paint , in conjunction with a fully anodized housing and dichromate pistons, provides the D-Series actuators with a highly corrosion resistant surface. Coupled with a ‘aircraft grade’ hard anodized aluminum pinion, all 304 SS fasteners, the D-Series provides excellent protection from hostile corrosive environments.
• BettisGuardTM – For the most extreme applications, BettisGuard™ adds the highest practical level of corrosion protection by impregnating the body and end caps, both internally and externally, with a fluoropolymer-based epoxy resin giving a smooth, hard finish. Combined with aluminum pinion gears (option BGA).
• Three-Point Suspension – D-Series pistons feature a unique, three point suspension system. Each piston has three, wide, machined 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 tilt in the actuator bore. To accept and distribute this loading the D-Series is also equipped with a low friction Nylatron body 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 on other designs with only narrow heal bearings. This feature provides for a more dependable actuator, with a longer life 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 profile that prevents the pinion gear from blowouts.
• NAMUR Mounting – Allows close coupling to NAMUR designated accessories. The pinion gear interface supports an international standard drive for positioners, switches and other accessories.
• Modular – The D-Series actuators 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.
• 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.
