D-Series Rack & Pinion Pneumatic Actuators

Transcription

1 D-Series Rack & Pinion Pneumatic Actuators

2 Introduction Bettis D-Series pneumatic rack and pinion actuators provide its users with a tough, work-horse like product for reliable use and economy in valve automation. designed for use in 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 90 turn devices. The D-Series actuators are compact and lightweight, making them very suitable for installation within areas of tight piping connections. A tough reliable work horse with a 5 year warranty for use in all heavy duty applications Operating Ranges D-Series actuators produce torque outputs up to 22,379 in-lb (2,528 Nm) for doubleacting models and 7,939 in-lb (897 Nm) spring end torques on spring-return models. D-Series pneumatic actuators are suitable for continuous operation at pressures ranging from 40 to 120 psig (3 to 8 bar) while exposed to temperatures of -4 F to +175 F (-20 C to +80 C). Optional temperature trims extend the range from -40 F to +250 F (-40 C to C). Higher temperature options may be offered by consulting the factory. D-Series actuators offer many significant benefits. Among them are: 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. BettisGuard TM 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). 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. 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. 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.

3 Precision dual stroke adjustment Low friction piston head and heel bearings NAMUR accessory interface One piece, blow-out proof pinion gear Polyester TGIC-free powder coating provides excellent corrosion resistance and chip protection on end caps. Three point suspension eliminates metal-to-metal contact between pistons and cylinder and promotes high cycle life Acorn nut and O-ring seal protect the bolt threads, prevent contamination and water ingress Nylatron guide band provides 360 piston rack support ISO/DIN mounting interface for low-profile direct mounting to valves 304 stainless steel fasteners Replaceable drive inserts for universal mounting are easily adapted for custom applications NAMUR solenoid direct mounting interface pattern. Note that air ports are also tapped for conventional 1/4 18 NPT fittings, except the ultra-small model D0012 which utilizes 1/8-27 NPT. Splined Inserts Fit into the bottom of the pinion gear shaft to allow universal mounting to a wide range of valve stem. Eliminates the need and expense of special brackets and couplings. Available for virtually any valve stem including square, double-d and key drives.

4 Materials of Construction Body Precision cast anodized aluminum alloy Pinion Gear Single piece aircraft grade aluminum alloy, hard anodized. Pistons Cast aluminum alloy with Dichromate corrosion protection. End Caps Cast aluminum alloy with polyester TGIC-free powder coated paint. Fasteners 304 series stainless steel. Seals Nitrile seals are standard. Viton is available for high temperature and silicone for low temperature. Springs High quality carbon steel springs for maximum life. Bearings Nylatron as a standard. Special trims available. NAMUR Control Valves and Switches For actuator control via an electric or pneumatic signal, Bettis can supply a wide variety of control valves. The direct mount feature to the NAMUR interface eliminates the expense of interconnecting tubing and fittings. The universal valve (5/2 or 3/2) can be used for double-acting or springreturn. The single solenoid control is continuously rated and, in the event of electrical failure, the actuator returns to the clockwise (normal closed or open) position; by mechanical spring in single- acting and air in the case of double-acting. NAMUR is an international standard which allows direct mounting of control components such as solenoid valves, positioners and mechanical or proximity switches. Note that all D models 0025 through 1600 actuators have air ports which have been drilled and tapped to 1/4 18 NPT in the event that traditional imperial tubing or piping is required. D 0012 models (due to size constraints) have as standard 1/8 NPT body air ports with a special non NAMUR bolt pattern. As options, a NAMUR solenoid interface block and NAMUR switch adapter are available for the D0012. Control Systems Bettis D-Series actuators can be equipped with a wide variety of control systems. Components such as the Topworx range of switchbox accessories and any NAMUR control component are provided as a standard from Emerson Process Management Valve Automation and are very easily bolted on to suit the required application. Bettis D-series Actuator Range Torque (@ 5.5 bar / 80PSI) Actuator sizes: - Ball : Nm ,4 Valve types: - Butterfly: D12 1/2 / DN12 D25 D40 D65 D100 D150 D200 D350 D600 D950 D / DN250 2 / DN50 20 / DN500 In.lb Typical Specifications Operating Pressures Temperature Media Rotation Spring-return and double-acting psig (3 to 8 bar) Standard -4 F to +175 F -4 F to +250 F* -40 F to +175 F *consult factory for higher temperatures Dry or lubricated air; non-corrosive gas Nominal 90, total travel adjustment 96 (see inset in middle page) For more detailed technical information see our online documentation under Document number [DOC.DSB.BD.US]

5 SIL Rating and FMEDA Bettis D -Series rack & pinion actuators have had a failure modes, effects and diagnostics assessment (FMEDA) conducted on them as performed by the Exida assessment organization, in accordance with the IEC code, indicating that they are suitable for use as a SIL 2 (Safety Integrity Level) rated product. Bettis D -Series are classified as type A1 devices with a hardware fault tolerance of zero and a user of a Bettis D actuator can utilize the failure rates shown in the FMEDA report in a probabilistic model of a safety instrumented function (SIF) to determine suitability in part for a safety instrumented system (SIS) usage at a particular safety integrity level (SIL). Actuator / Accessory Interfaces Bettis D pneumatic actuators are manufactured to meet the following worldwide quality and safety standards: Safety Standards Bettis actuators can be packaged together with a range of accessories including; Wireless transmitter MP04 Digital valve positioners (DVC s) Product Interface Standards VDI/VDE3845 (NAMUR) ISO 5211 Solenoids Company Operations Standards ISO 9001 Quality Assurance Pressure Regulators Manual override gear-boxes In addition, these accessories often include dedicated options like; Speed control plates Breather blocks Block & bleed valves All of the above fit together by way of standard product interfaces such as NAMUR for solenoid and switch box connections and ISO-5211 for valve flange connections. Using these well known international standards ensures that Bettis products will comply with application requirements in projects worldwide. Emerson brands for most common control accessories: Digital Valve Controllers: Fisher Positioners: Fisher Regulators: Fisher Switch boxes: TopWorx Wireless position monitor: TopWorx Solenoid valves: ASCO Numatics

6 World Area Configuration Centers (WACC) offer sales support, service, inventory and commissioning to our global customers. Choose the WACC or sales office nearest you: NORTH & SOUTH AMERICA Northwest Freeway Houston TX USA T F Av. Hollingsworth 325 Iporanga Sorocaba SP Brazil T F ASIA PACIFIC No. 9 Gul Road #01-02 Singapore T F No. 1 Lai Yuan Road Wuqing Development Area Tianjin P. R. China T F MIDDLE EAST & AFRICA P. O. Box Dubai United Arab Emirates T F P. O. Box Jubail Saudi Arabia T F Angus Crescent Longmeadow Business Estate East P.O. Box 6908 Greenstone 1616 Modderfontein Extension 5 South Africa T F EUROPE Berenyi u Videoton Industry Park Building #230 Székesfehérvár 8000 Hungary T F Emerson Process Management. All rights reserved. For complete list of sales and manufacturing sites, please visit Or contact us at info.valveautomation@emerson.com The Emerson logo is a trademark and service mark of Emerson Electric Co. Bettis is a mark of one of the Emerson Process Management family of companies. All other marks are property of their respective owners. DOC.6P.BD.US Rev E 01-16