Ontario Operator-in-Training (OIT) Practice Exam

What is a key feature of butterfly valves?

1. Used exclusively for high-pressure systems

2. Highly efficient for controlling flow

3. Primarily used for filtering

4. Cannot control flow

The correct answer is: Highly efficient for controlling flow

The choice indicating that butterfly valves are highly efficient for controlling flow is correct because these valves are designed with a disc-like structure that pivots around a shaft. When the valve is opened, the disc rotates and allows fluid to flow through the valve with minimal resistance. This design makes butterfly valves particularly well-suited for regulating flow, as they can be partially opened to adjust the flow rate effectively. Additionally, they provide a quick and reliable shut-off and can handle a variety of liquids and gases. In contrast, the other options present characteristics that do not align with the functionality of a butterfly valve. While butterfly valves can be used in various pressure scenarios, their efficiency in flow control is their defining feature. They are not primarily designed for filtering purposes; instead, other types of valves and fixtures are more suited for that role. Furthermore, the claim that they cannot control flow is inaccurate, as controlling flow is one of their primary functions.