CWEA Maintenance Technologist Practice Test

Which of the following valves is unsuitable for high-pressure flow?

1. Ball valve

2. Gate valve

3. Needle valve

4. Butterfly valve

The correct answer is: Needle valve

The needle valve is generally considered unsuitable for high-pressure flow due to its design, which involves a slender, tapered seat that allows for precise flow regulation but can easily be compromised under high pressure. While needle valves are excellent for applications requiring fine control of low-flow rates, their limited flow capacity and vulnerability to pressure-induced damage make them less effective in high-pressure situations. In contrast, ball valves are robust and designed for high-pressure applications, providing a tight seal and quick operation. Gate valves also perform well under high pressure, offering minimal flow resistance when fully open. Butterfly valves can handle high-pressure systems effectively when they are appropriately sized and constructed for the application. Thus, the characteristics of needle valves render them unsuitable for high-pressure flow situations.