D-Series Rack & Pinion Pneumatic Actuators...SIL Rating Actuator / Accessory Interfaces and FMEDA Bettis D-Series rack & pinion actuators have had a failure modes, effects and diagnostics

D-Series Rack & Pinion Pneumatic Actuators(Product Discontinued)

Introduction

A tough reliable work horse

with a 5 year warranty for use in all heavy duty

applications

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.

Operating Ranges

D-Series actuators produce torque outputs up to 22,379 in-lb (2,528 Nm) for double-acting 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 + 120°C). Higher temperature options may be offered by consulting the factory.

D-Series actuators offer many significant benefits. Among them are:

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.

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.

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).

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.

+3° -10°

65°

90°

96°

+3°

-15°

Replaceable drive inserts for universal mounting are easily adapted for custom applications

Polyester TGIC-free powder coating provides excellent corrosion resistance and chip protection on end caps

304 stainlesssteel fasteners

One piece, blow-out proof pinion gear

NAMUR accessory interface

Precision dual stroke adjustment Low friction piston head

and heel bearings

ISO/DIN mounting interface for low-profile direct mounting to valves

Nylatron guide band provides 360° piston rack support

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.

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

Splined InsertsFit 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.

Materials of Construction

Body – Precision cast anodized aluminum alloyPinion Gear – Single piece ‘aircraft grade’ aluminum alloy, hard anodizedPistons – Cast aluminum alloy with Dichromate corrosion protectionEnd Caps – Cast aluminum alloy with polyester TGIC-free powder coated paintFasteners – 304 series stainless steelSeals – Nitrile seals are standard. Viton is available for high temperature and silicone for low temperatureSprings – High quality carbon steel springs for maximum lifeBearings – Nylatron as a standard. Special trims available

Bettis D-series Actuator Range

13,4

105

168

230

400

679

1014

1676

Actuatorsizes:

- Ball :

Valve types:

- Butterfly:

Torq

ue (@

5.5

bar

/ 80

PSI)

Nm

119

220

413

630

930

1487

2042

3547

6028

8997

14874

D12

1/2” / DN12

D25D40

D65D100

D150D200

D350D600

D950

D1600

10” / DN250

2” / DN50 20” / DN500

In.lb.

25

47

71

NAMUR Control Valves and SwitchesFor 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 spring-return. 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; bymechanical 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 0012models (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 SystemsBettis 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 – Actuation Technologies and are very easily bolted on to suit the required application.

Operating PressuresSpring-return and double-acting 40 – 120 psig (3 to 8 bar)

Temperature Standard -4°F to +175°F

-4°F to +250°F*

-40°F to +175°F

*consult factory for higher temperatures

Media Dry or lubricated air; non-corrosive gas

RotationNominal 90°, total travel adjustment 96° (see inset in middle page)

Typical Specifications

For more detailed technical information see our online documentation under www.Bettis.com/technical-data

Document number [DOC.DSB.BD.US]

Actuator / Accessory InterfacesSIL 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 61508 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).

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™

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.

Bettis actuators can be packaged together with a range of accessories including;

In addition, these accessories often include dedicated options like;

Speed control plates Breather blocks Block & bleed valves

SolenoidsWirelesstransmitter

Digital valve positioners (DVC’s) Manual override gear-boxes

Pressure Regulators

MP04

Safety Standards

Product Interface Standards

VDI/VDE3845 (NAMUR)ISO – 5211

Company Operations Standards

ISO – 9001 Quality Assurance

Bettis D pneumatic actuators are manufactured to meet the following worldwide quality and safety standards:

This product is only intended for use in large-scale fixed installations excluded from the scope of Directive 2011/65/EU on the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS 2).

BRO-02-02-0035-EN REV D 01-19

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