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Pneumatic rotary actuators have limitations
when it comes to high - temperature applications, and their suitability depends
on several factors.
Most standard pneumatic rotary actuators
are designed for normal - temperature operation. When exposed to high
temperatures, several issues may arise. The materials used in the actuator,
such as the seals and lubricants, can be affected. High temperatures can cause
seals to harden, crack, or lose their elasticity, leading to air leaks and
reduced performance. The lubricants may also break down or evaporate,
increasing friction and wear on the moving parts.
However, there are specialized pneumatic
rotary actuators available that are designed for high - temperature
environments. These actuators use high - temperature - resistant materials for
the seals, such as silicone or fluorocarbon - based elastomers, and employ heat
- resistant lubricants. Additionally, the actuator's body may be made of
materials with good heat - dissipation properties, like certain grades of
stainless steel or aluminum alloys.
In some cases, if the high - temperature
application has relatively short - term or intermittent heat exposure, standard
pneumatic rotary actuators may still be used with proper cooling measures. This
could include using heat shields, forced air cooling, or allowing for
sufficient cooling periods between operations. But for continuous high -
temperature operation above the normal operating range, it is generally
recommended to use specialized high - temperature - rated pneumatic rotary
actuators to ensure reliable and efficient performance.
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