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Pneumatic Actuators |
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Pneumatic actuators are required to operate in a wide variety of
applications; they have to function first time every time, often under
very difficult circumstances. One actuator may perform hundreds of
cycles 24 hours a day, whereas another may open and close just once a
month, but still be ready to shut down instantly on a failure signal.
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Optimum Performance |
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We realise that the performance of our pneumatic actuators is vitally
important to your production process. An actuator that does not function
well often has serious consequences for the outcome of the process. That
is why quality has been our primary concept in actuator development.
El-O-Matic pneumatic actuators are reliable, quality products,
continuously providing optimum performance under all circumstances.
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Features |
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- For application to ball, plug and
butterfly valves.
- Can be used in other quarter-turn
applications, such as dampers and pressure regulators.
- Actuators are made of high duty
Aluminium alloys, providing optimum strength and corrosion resistance.
- Compact rack & pinion design.
- Can be supplied in single (spring
return) or double acting versions.
- Choice from twelve sizes models, with
a torque range from 12 to 4000 Nm (106 to 35400 lbf.in.).
- Mounting for solenoid valves and
position signallers to the NAMUR standard (VDI/VDE 3845).
- Valve mounting and drive dimensions to
the ISO 5211 or DIN 3337.
- Drive shaft provided with insert, for
low cost, versatile direct valve mountings.
- Anti-blow-out shaft.
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Operating Principle |
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Pneumatic actuators come in two versions: double acting and single
acting (spring return). Both versions are designed in such a way that
(with the exception of the position indicator) there are no moving parts
on the outside. This makes them safe, easy to install and virtually
maintenance free. Furthermore, the compact rack and pinion construction
means that actuators are lightweight and occupy a minimum of space. |
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Ample Choice Of Spring Packages |
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Spring return, single acting actuators are
used in most safety systems. Their ability to automatically return the
valve to its fail-safe position on air failure provides the vital link
for ultimate system shut down. El-O-Matic spring return actuators have
modular spring packages, which enable them to be easily applied to a
wide variety of supply pressures and operating conditions.
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Standard Specification |
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- Pressure 0.2 to 8 bar (3 to 120 PSI)
- Temperature -20°C to +80°C (-4°F
to +176°F)
- Materials Housing:
- Aluminium alloy
- Shaft: Hard anodised aluminium alloy
- Finish Polyester non-TGIC based powder
coating
- Lifespan Minimum of 500,000 cycles
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Limit Stops |
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Limit stops are necessary where the precise adjustment of the valve’s
open position is required. These are standard on all actuators up to
1600 Nm. and optional on the two larger sizes. Actuators with double
stroke adjustment are also available for those applications on high
performance butterfly valves (closed position).
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Standardisation |
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El-O-Matic actuators comply fully with all the relevant industry
standards. Control interfaces for solenoid valves, switch boxes and
positioners satisfy the NAMUR standard (VDI/VDE 3845). Valve mounting
and drive dimensions are to ISO 5211 standard (option DIN 3337).
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Inserts |
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 Actuator
sizes up to 1600 Nm. (14160 lb.in.) are fitted with drive inserts. This
enables actuators to be directly mounted onto suitable valves and
eliminates the need for a bracket and coupling type mounting kit. The
increasing use of direct mounts significantly cuts the cost of the
valve/actuator assembly. Standard actuators are fitted with square drive
inserts in accordance with ISO 5211 (or DIN 3337), but a wide variety of
other inserts are also available. Special inserts may have oversize or
undersize squares, or with double-D or shaft key way forms. These can be
supplied on factory built actuators or as loose items, drive inserts are
easily replaceable at distributor or end user level.
Where direct mounts are not possible, for instance on valves with
exposed grand packing, the use of inserts often simplifies the design of
the mounting kit.
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Long Life Span |
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El-O-Matic actuators have a patented 3-point guiding system, full
synthetic bearings and a rack & pinion gearing. High precision gear
cutting methods provide close tolerances and ensure minimum gear
backlash, all of which guarantees virtually the longest working life of
any actuator in the industry.
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Application |
The choice of actuator depends primarily on the valves’ torque
requirement, and with El-O-Matic you have the widest range possible, 12
basic model sizes covering a torque range from 12 to 4000 Nm. (106 to
35400 lb.in.).But for optimum
actuator sizing many factors may need consideration. El-O-Matic has all
available relevant technical data on practically all the quarter-turn
valve manufacturers in the world. This electronic database enables us to
select just the right actuator for you, whatever the valve type: ball,
butterfly or plug valve. |
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Special Versions |
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Special actuators can be built to suit a wide variety of extreme
applications: high temperature, low temperature, offshore, fire safe,
with different operating media, etc.
Ask our technical specialists for more information about these special
applications.
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Downloads |
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