The probable cause of erratic operation of a...

Question 1 / 205eccefa5bacbc34ba4d487d3

Question 1 of 205eccefa5bacbc34ba4d487d3

The probable cause of erratic operation of a pneumatically controlled steam pressure reducing valve is __________.

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Question 1 of 20

5eccefa5bacbc34ba4d487d3

The probable cause of erratic operation of a pneumatically controlled steam pressure reducing valve is __________.

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🔍 Key Concepts

• Pneumatically controlled steam pressure reducing valve – how air pressure, steam pressure, and the pilot valve interact • Difference between a control problem (signal/pilot) and a capacity/pressure problem (spring, supply pressure) • How a defective pilot or control signal typically shows up as hunting or erratic movements

💭 Think About

• Ask yourself: which option is most likely to cause rapid, hunting, or unstable motion rather than a steady but wrong outlet pressure? • Think about how the pneumatic signal reaches the main valve: what small device actually converts the air control signal into movement of the main valve? • Which choice would mainly limit or shift the pressure range in a stable way, and which would cause the valve to keep over‑correcting back and forth?

✅ Before You Answer

• Identify which part of the system directly modulates the main valve in response to small changes in pneumatic signal. • Decide which fault would cause hunting/oscillation (erratic operation) rather than simply a low or high but stable outlet pressure. • Check whether insufficient steam supply pressure would make the valve behave erratically, or just prevent it from reaching the set outlet pressure in a predictable way.

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Question 1 of 20

The probable cause of erratic operation of a pneumatically controlled steam pressure reducing valve is __________.

the range spring has become weakened

an incorrect loading pressure supplied to the power unit

a defective air pilot valve

insufficient steam supply pressure

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Question 1 / 205eccefa5bacbc34ba4d487d3

Question 1 of 205eccefa5bacbc34ba4d487d3

The probable cause of erratic operation of a pneumatically controlled steam pressure reducing valve is __________.

Back

Question 1 of 20

5eccefa5bacbc34ba4d487d3

The probable cause of erratic operation of a pneumatically controlled steam pressure reducing valve is __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed