DOC.6P.BD.US

D-Series Rack & Pinion Pneumatic Actuators
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
+ 120°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.
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).
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.
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
+3°
-10°
Replaceable drive inserts for
universal mounting are easily
adapted for custom applications
96°
90°
65°
-15°
+3°
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.
Materials of Construction
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.
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 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
Typical Specifications
In.lb.
1676
14874
1014
8997
679
6028
400
3547
230
2042
168
1487
105
930
71
630
47
413
25
220
13,4
119
Actuator
sizes:
D1
2
D2
5
D4
0
D6
5
D1
00
D1
50
D2
00
D3
50
D6
00
D9
50
D1
60
0
Torque (@ 5.5 bar / 80PSI)
Nm
Valve types:
- Ball :
1/2” / DN12
10” / DN250
- Butterfly:
2” / DN50
20” / DN500
Operating Pressures
Spring-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
Rotation
Nominal 90°, total travel adjustment 96°
(see inset in middle page)
For more detailed technical information see our
online documentation under www.bettis.com/technical-data
Document number [DOC.DSB.BD.US]
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 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).
Actuator / Accessory Interfaces
Bettis D pneumatic actuators are manufactured to meet the following
worldwide quality and safety standards:
Safety
Standards
MP04
Product Interface
Standards
Company Operations
Standards
VDI/VDE3845 (NAMUR)
ISO – 5211
ISO – 9001
Quality Assurance
Bettis actuators can be packaged together with a range of accessories including;
Wireless
transmitter
Solenoids
Digital valve positioners (DVC’s)
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™
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
MIDDLE EAST & AFRICA
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Houston TX 77065
USA
T +1 281 477 4100
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P. O. Box 17033
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United Arab Emirates
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325 Iporanga Sorocaba
SP 18087-105
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Jubail 31961
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F +966 3 340 8790
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#01-02 Singapore 629361
T +65 6501 4600
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Wuqing Development Area
Tianjin 301700
P. R. China
T +86 22 8212 3300
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24 Angus Crescent
Longmeadow Business Estate East
P.O. Box 6908 Greenstone
1616 Modderfontein Extension 5
South Africa
T +27 11 451 3700
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EUROPE
Berenyi u. 72- 100
Videoton Industry Park
Building #230
Székesfehérvár 8000
Hungary
T +36 22 53 09 50
F +36 22 54 37 00
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www.emersonprocess.com/bettis
DOC.6P.BD.US Rev E 01-16