A ______ valve opens by lifting a wedge out.

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Study for the ACG Certified Commissioning Authority (CxA) Exam. Prepare with flashcards and multiple choice questions, each comes with hints and explanations. Ace your exam!

Multiple Choice

A ______ valve opens by lifting a wedge out.

Explanation:
Opening a valve by lifting a wedge out describes how a gate valve works. The flow path is blocked by a wedge-shaped gate that sits between two seats. When the stem is operated to open, the gate rises vertically and is lifted out of the seating surfaces, creating a clear, straight-through bore for flow. This lifting action is the defining characteristic of the gate valve mechanism. In contrast, a ball valve uses a rotating ball to block or align with the flow, a globe valve uses a movable disk that slides in and out to throttle and seal, and a butterfly valve rotates a disk around a shaft to open or close. None of those rely on lifting a wedge out of its seat.

Opening a valve by lifting a wedge out describes how a gate valve works. The flow path is blocked by a wedge-shaped gate that sits between two seats. When the stem is operated to open, the gate rises vertically and is lifted out of the seating surfaces, creating a clear, straight-through bore for flow. This lifting action is the defining characteristic of the gate valve mechanism.

In contrast, a ball valve uses a rotating ball to block or align with the flow, a globe valve uses a movable disk that slides in and out to throttle and seal, and a butterfly valve rotates a disk around a shaft to open or close. None of those rely on lifting a wedge out of its seat.

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