Which valve is described as using a flat circular plate that rotates across the cross section to control the flow?

Which valve is described as using a flat circular plate that rotates across the cross section to control the flow?

• A. Gate Valve
• B. Steamer Connection
• C. Cavitation
• D. Butterfly Valve

Answer: (D)

A flat circular plate that rotates across the pipe cross section to control flow identifies a butterfly valve. The disk is mounted on a shaft and you turn it a quarter turn to move between open and closed. When the disk lies in line with the pipe, flow is allowed with minimal obstruction; when it turns perpendicular, it blocks the passage. This rotating-disc action is the hallmark of a butterfly valve, offering a compact, quick-isolation option for piping. This differs from a gate valve, which uses a sliding gate to raise or lower into a seat rather than rotating a disc. The other terms aren’t valve types at all—the steamer connection isn’t a valve mechanism, and cavitation describes a flow phenomenon that can occur in valves, not a control device itself.

A flat circular plate that rotates across the pipe cross section to control flow identifies a butterfly valve. The disk is mounted on a shaft and you turn it a quarter turn to move between open and closed. When the disk lies in line with the pipe, flow is allowed with minimal obstruction; when it turns perpendicular, it blocks the passage. This rotating-disc action is the hallmark of a butterfly valve, offering a compact, quick-isolation option for piping.

This differs from a gate valve, which uses a sliding gate to raise or lower into a seat rather than rotating a disc. The other terms aren’t valve types at all—the steamer connection isn’t a valve mechanism, and cavitation describes a flow phenomenon that can occur in valves, not a control device itself.