What type of valve is designed to control water-flow rate by partially opening or closing?

What type of valve is designed to control water-flow rate by partially opening or closing?

• A. A throttling valve
• B. A check valve
• C. A globe valve
• D. A gate valve

Answer: (A)

The main idea here is regulating flow by changing how much the valve is open. A throttling valve is built to control the flow rate by adjusting its opening—partially opening reduces the path for water and lowers the flow, and the degree of opening sets the exact rate you want. This makes it the best fit for applications where precise control of water flow is needed, rather than simply starting or stopping flow. Other valves serve different primary purposes. A check valve prevents backflow and doesn’t regulate flow. A globe valve can be used to throttle, but it’s a general-purpose throttling-capable valve rather than one defined by its primary function of controlling flow rate. A gate valve is designed mainly for on/off service with minimal throttling capability.

The main idea here is regulating flow by changing how much the valve is open. A throttling valve is built to control the flow rate by adjusting its opening—partially opening reduces the path for water and lowers the flow, and the degree of opening sets the exact rate you want. This makes it the best fit for applications where precise control of water flow is needed, rather than simply starting or stopping flow.

Other valves serve different primary purposes. A check valve prevents backflow and doesn’t regulate flow. A globe valve can be used to throttle, but it’s a general-purpose throttling-capable valve rather than one defined by its primary function of controlling flow rate. A gate valve is designed mainly for on/off service with minimal throttling capability.