Why should the main steam stop valve of an...

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Question 1 of 205eccefa2bacbc34ba4d47bf0

Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?

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5eccefa2bacbc34ba4d47bf0

Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?

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🔍 Key Concepts

• Thermal expansion of valve parts when the boiler heats up • Purpose of easing a valve off its seat before operation • Difference between checking external seals/packing vs. internal seating and freedom of movement

💭 Think About

• When a boiler goes from cold to hot, what happens to the valve disc, seat, and stem inside the main steam stop valve? • Which option relates to making sure the valve can move freely again after it has been heated, rather than inspecting or testing external parts? • Is this procedure usually done to inspect the valve visually, or to condition the valve for later operation?

✅ Before You Answer

• Focus on the internal movement of the valve disc and stem, not external leakage points. • Ask whether you could realistically inspect packing, bonnet seal, or stem surface by just easing the valve off the seat. • Consider which choice directly connects to preventing the valve from becoming stuck after heating.

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Question 1 of 205eccefa2bacbc34ba4d47bf0

Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?

Back

Question 1 of 20

5eccefa2bacbc34ba4d47bf0

Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?

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

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