Which term is represented by the bowtie with a black ball on top?

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Study for the Junior Officer Surface Material Readiness Course Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which term is represented by the bowtie with a black ball on top?

Explanation:
The bowtie shape marks a stop valve in piping diagrams, and the black ball on top is the locking indicator. When a lock is shown on the valve, it designates that the valve’s position is secured. In this symbol, the lock is engaged in the closed position, so the valve is locked shut. That’s why the best interpretation is a stop valve locked shut. A swing check valve would look different because it represents a check mechanism that swings, not a stop valve with a lock. A plain stop valve would lack the locking indicator, and a stop valve locked open would imply the lock keeps it open, not closed.

The bowtie shape marks a stop valve in piping diagrams, and the black ball on top is the locking indicator. When a lock is shown on the valve, it designates that the valve’s position is secured. In this symbol, the lock is engaged in the closed position, so the valve is locked shut. That’s why the best interpretation is a stop valve locked shut. A swing check valve would look different because it represents a check mechanism that swings, not a stop valve with a lock. A plain stop valve would lack the locking indicator, and a stop valve locked open would imply the lock keeps it open, not closed.

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