Determine Effect of Each Fault for Pneumatic Force-balance System

Determine the final effect of each fault for this pneumatic force-balance system:

Pneumatic Force-balance System

• Clogged nozzle
• Clogged restriction
• Clogged tube at supply port of amplifying relay
• Broken leaf spring inside amplifying relay
• Major hole or tear in the diaphragm inside the amplifying relay

Be sure to explain the final effects of each of these faults!

Answer:

• Clogged nozzle: output pressure saturates high

• Clogged restriction: output pressure saturates low

• Clogged tube at supply port of amplifying relay: output pressure saturates low

• Broken leaf spring inside amplifying relay: output pressure may saturate high or possibly oscillate

• Major hole or tear in diaphragm inside amplifying relay: The system responds very little to the applied force.

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Credits: Tony R. Kuphaldt