Red Seal Plumbing Practice Exam

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Which valve consists of two spring-loaded flaps seated into a housing?

Gate valve
Globe valve
Non slam valve
Butterfly valve

The correct answer is: Non slam valve

A gate valve has a gate that moves up and down to either block or allow flow. A globe valve has a round globe-like shape that can be lifted to allow flow. A butterfly valve uses a disc and a shaft to control flow. The non slam valve, or non-return valve, uses two spring-loaded flaps to prevent backflow. These flaps are seated into a housing, creating a tight seal to ensure flow only moves in one direction. This makes it useful in applications where backflow is not desired, such as pumping systems or pipelines. The other options listed do not have this specific feature.