Alberta Boilers Safety Association (ABSA) Practice Test

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Study for the Alberta Boilers Safety Association Test with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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Which type of valve is typically used for on/off service with minimal pressure drops?

Globe valve
Ball valve
Buttweld valve
Check valve

The correct answer is: Ball valve

The ball valve is typically used for on/off service with minimal pressure drops due to its design. Unlike other types of valves, ball valves feature a spherical disc, or 'ball,' that floats within the valve body. When the valve is fully open, the ball is aligned with the flow direction, allowing fluid to pass through with very little resistance. This results in lower pressure drops compared to other valves. Additionally, ball valves provide a tight seal, which minimizes the risk of leakage when in the closed position. This capability makes them particularly effective for applications where quick and reliable shutoff is necessary. The ease of operation, durability, and ability to handle various fluid types also contribute to their popularity in on/off applications. In contrast, globe valves, although useful for throttling, create more resistance to flow when fully open, resulting in higher pressure drops. Check valves are designed to prevent backflow rather than for on/off service, while butt-weld valves typically refer to connections rather than a type of control flow mechanism.