Florida Fire State Practice Exam

What type of valve is commonly found on the intake of large pumps?

1. Ball valve

2. Butterfly valve

3. Gate valve

4. Check valve

The correct answer is: Butterfly valve

The correct choice is the butterfly valve, which is commonly used on the intake of large pumps. Butterfly valves are ideal for large flow applications because they have a simple design that allows for quick opening and closing, offering low pressure drop and high flow capacity. This type of valve consists of a circular disc or plate that rotates on a spindle to either allow or restrict the flow of water. This design is particularly advantageous in firefighting operations, as it enables rapid adjustments to water flow as needed. When the valve is fully opened (turned parallel to the flow path), it creates minimal resistance, allowing for maximum flow to the pump. Conversely, when the valve is closed (turned perpendicular), it effectively stops the flow. In contrast, other types of valves have their specific uses but may not provide the same level of efficiency or rapid control needed in pump operations. For instance, ball valves are generally used for on/off control in smaller lines due to their rapid operate feature, but they might not offer the same flow characteristics in larger systems. Gate valves, while effective for fully open and shut positions, can have higher friction losses and are not as quick to operate. Check valves, on the other hand, are designed to prevent backflow and are not suitable for the