Referring to the device shown in the...

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Question 1 of 205eccefa5bacbc34ba4d487e5

Referring to the device shown in the illustration, if a reversed output were desired from a comparable unit as the system pressure increased, the necessary physical changes to the unit would be __________. See illustration GS-0050.

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🔍 Key Concepts

• How a flapper-nozzle pilot valve creates an output that increases or decreases with system pressure • Difference between direct-acting and reverse-acting pneumatic controllers • How feedback/sensing connections or levers can be repositioned to change the direction of motion transmitted to the pilot valve

💭 Think About

• Trace what happens in the illustration when the process/system pressure increases: which way does the diaphragm or power head move, and what does that do to the flapper and nozzle? • Ask yourself: to make the output move in the opposite direction for the same pressure change, is it easier to reverse the motion mechanically (lever/diaphragm arrangement) or to change where the feedback signal is applied? • Look at which parts in the drawing could be changed without redesigning the entire pilot valve and would still flip the sense of the output.

✅ Before You Answer

• Identify clearly which parts are the power head/motor, the feedback or sensing connection, and the pilot valve/nozzle in GS-0050. • Decide which option changes the direction of force on the pilot mechanism when pressure rises, instead of just changing seating style or minor details. • Verify that your choice would actually make the controller reverse-acting (output decreases when measured pressure increases, or vice versa) by mentally walking through the motion step-by-step.

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