What type of valve allows for precise control of flow using a rotating disk?

Prepare for the Water Distribution Level 3 Exam with comprehensive questions, detailed answers, and in-depth explanations. Equip yourself with the knowledge needed to succeed!

The butterfly valve is designed with a circular disk that rotates within the flow path to regulate the flow of fluid. Its mechanism allows for precise control over the flow rate based on the angle of the disk's rotation. When fully opened, the disk aligns parallel to the flow and minimizes resistance, while partially closing it can create a narrow passage that allows for fine adjustments in flow. This rotary motion provides precise throttling capabilities that are beneficial in various applications.

In contrast, diaphragm valves use a flexible diaphragm to control flow, which doesn’t offer the same level of precision in terms of flow adjustment. Pinch valves rely on a pinching mechanism to obstruct flow, making them less suitable for precise control. Globe valves offer good throttling capabilities as well, but their design does not involve a rotating disk, making their flow regulation less precise compared to the butterfly valve's rotary design.

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