It is desirable for an auxiliary boiler...

Question 1 / 270705eccefa2bacbc34ba4d47bdc

Question 1 of 270705eccefa2bacbc34ba4d47bdc

It is desirable for an auxiliary boiler safety valve to pop open and reseat firmly to __________.

Question 1 of 27070

It is desirable for an auxiliary boiler safety valve to pop open and reseat firmly to __________.

🔍 Key Concepts

• Safety valve operation on auxiliary boilers • Meaning of blowdown (difference between popping and reseating pressure) • Effects of wire drawing, pounding, and proper seating of valves

💭 Think About

• Think about what happens if a safety valve only cracks slightly open and does not reseat cleanly—how could that affect the sealing surfaces and boiler pressure control? • Which option best describes the purpose of having a clear, sharp pop at a set pressure and then a firm reseating at a lower pressure? • Which of the listed problems is specifically controlled by designing a definite opening and closing action in the safety valve?

✅ Before You Answer

• Make sure you understand blowdown as the pressure drop between valve popping and reseating, not just "blowing down" a boiler. • Compare the terms wire drawing, pounding, and blowdown—which one is directly related to how far apart the opening and closing pressures are set? • Verify in your steam systems notes which phenomenon is minimized when the valve does NOT leak or chatter as it closes but instead reseats firmly.

Question 1 of 27070

It is desirable for an auxiliary boiler safety valve to pop open and reseat firmly to __________.

give warning that excessive boiler pressure has been reached

prevent wire drawing of the disc and seat

prevent valve pounding

provide sufficient blow down

Question 1 / 270705eccefa2bacbc34ba4d47bdc

Question 1 of 270705eccefa2bacbc34ba4d47bdc

It is desirable for an auxiliary boiler safety valve to pop open and reseat firmly to __________.

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Question 1 of 27070

It is desirable for an auxiliary boiler safety valve to pop open and reseat firmly to __________.