Page 88 - PNEUMATIC SYSTEM INSTRUMENT
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PNEUMATIC ACTUATION METHOD
Figure 11.4: Schematics symbol of pneumatic actuation method
Air driven actuators include pneumatic cylinders, bellows, and vane
motors. Large diaphragm motors open and close pneumatically
actuated control valves or adjust their proportional position for
throttling control. When combined with return springs, pneumatic
actuators can be used to position dampers or to lift doors. Air brakes
on large trucks use rugged diaphragm actuation motors. Automotive
air conditioning and heating systems use manifold vacuum to energize
small diaphragm actuators on air dampers and water valves.
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