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Pneumatic rotary actuators can be made to
withstand corrosive conditions through several design features and material
choices:
Material Selection: The body of the
actuator is often constructed from corrosion - resistant materials such as
stainless steel or aluminum with a protective coating. Stainless steel offers
excellent resistance to rust and chemical attack, while aluminum can be
anodized to create a hard, protective oxide layer. For example, in food
processing plants where there may be exposure to acidic cleaning agents,
stainless - steel - bodied pneumatic rotary actuators are commonly used. The
internal components, like the piston and rack and pinion, can also be made of
or coated with materials that resist corrosion, such as chrome - plated steel.
Sealing Technologies: High - quality seals
are used to prevent corrosive substances from entering the actuator. These
seals are typically made of elastomers like nitrile rubber or fluorocarbon -
based materials, which have good chemical resistance. The seals create a
barrier between the internal components and the external environment,
protecting the actuator from moisture, chemicals, and other corrosive agents.
Protective Coatings and Finishes: In
addition to the base material, actuators may have additional protective
coatings or finishes. For instance, a powder - coat finish can provide an extra
layer of protection against corrosion. Some actuators may also have a special
lubricant that not only reduces friction but also helps to protect the
components from corrosion.
However, the effectiveness of these
measures can be affected by factors such as the severity of the corrosive
environment, the actuator's exposure time, and the quality of maintenance.
Regular inspection and maintenance are necessary to ensure that the protective
measures remain effective and to address any signs of corrosion promptly.
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