The full name of an OS&Y valve is:

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Multiple Choice

The full name of an OS&Y valve is:

Explanation:
The essential idea is that OS&Y refers to the stem arrangement of the valve: the stem is outside the valve body and is supported by a yoke. The name literally describes outside-stem and yoke, which matches how the valve is built and how its position is read. That makes the full term Outside-stem and yoke valve the correct one. The other options use a misspelling (yolk) or describe something different (such as open-system), which don’t align with what OS&Y stands for.

The essential idea is that OS&Y refers to the stem arrangement of the valve: the stem is outside the valve body and is supported by a yoke. The name literally describes outside-stem and yoke, which matches how the valve is built and how its position is read. That makes the full term Outside-stem and yoke valve the correct one. The other options use a misspelling (yolk) or describe something different (such as open-system), which don’t align with what OS&Y stands for.

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