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What acts as protection by severely restricting the propane flow when a propane line ahead of a regulator is broken or opened?

1) Pressure relief valve
2) Regulator
3) Flow control valve
4) Shut-off valve

Answer :

Final answer:

The correct answer is option 1) Pressure relief valve. A pressure relief valve restricts the propane flow when a propane line ahead of a regulator is broken or opened, preventing potential hazards.

Explanation:

The correct answer to the question is option 1) Pressure relief valve.

A pressure relief valve is designed to protect the system by releasing excess pressure when it exceeds a certain threshold. In the case of a broken or opened propane line ahead of a regulator, the pressure inside the line would increase, and the pressure relief valve would open, restricting the propane flow and preventing a potential explosion or other hazards.

For example, if a propane line leading to a grill is accidentally severed, the pressure relief valve would detect the sudden increase in pressure and open, reducing the flow of propane to a safe level.

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