To allow steam flow into the Deaerating Tank when needed, which valve is used?

Prepare for the Machinist's Mate (MM) "A" School Test 3. Study with our extensive collection of flashcards and multiple-choice questions, complete with hints and explanations to ensure you're ready for the exam.

Multiple Choice

To allow steam flow into the Deaerating Tank when needed, which valve is used?

Explanation:
The valve used is a check valve, which provides unidirectional flow. It opens to allow steam to enter the deaerating tank when pressure in the steam line is higher, and automatically closes to prevent any backflow from the tank into the steam line. This automatic one-way action protects the steam supply and ensures steam enters the tank only when needed. Other valves—manual gate or ball valves—would require operator action to open or close and do not inherently prevent backflow, while a relief valve is for releasing excess pressure, not directing flow into the tank.

The valve used is a check valve, which provides unidirectional flow. It opens to allow steam to enter the deaerating tank when pressure in the steam line is higher, and automatically closes to prevent any backflow from the tank into the steam line. This automatic one-way action protects the steam supply and ensures steam enters the tank only when needed. Other valves—manual gate or ball valves—would require operator action to open or close and do not inherently prevent backflow, while a relief valve is for releasing excess pressure, not directing flow into the tank.

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