When is the only time that both hand valves of a manifold gauge set should be open at the same time?

Name: When is the only time that both hand valves of a manifold gauge set should be open at the same time?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

During system evacuation, both hand valves of a manifold gauge set should be open to allow for the removal of air and moisture from the system by creating a vacuum. This process requires both the high and low side of the system to be open to the vacuum pump.

When Is the Only Time That Both Hand Valves of a Manifold