How does a gate valve function to stop water flow?

How does a gate valve function to stop water flow?

• A. By twisting a handle to remove a spring
• B. By lowering a wedge-shaped gate across the passage
• C. By rotating a ball inside the pipe
• D. By applying pressure at both ends of the valve

Answer: (B)

A gate valve functions to stop water flow by lowering a wedge-shaped gate across the passage through which the water flows. This design allows the valve to create a tight seal when the gate is fully closed, effectively blocking the flow of water. The wedge shape of the gate ensures that it fits securely against the valve seat as it descends, minimizing leaks and preventing water from passing through. In this mechanism, the handle or handwheel is turned, which raises or lowers the gate mechanism. When the gate is fully lowered, it obstructs the flow path, halting the movement of water. This type of valve is particularly effective for applications where a straight, unobstructed flow is needed when open, and it is commonly used in scenarios where the flow needs to be completely turned off rather than throttled.

A gate valve functions to stop water flow by lowering a wedge-shaped gate across the passage through which the water flows. This design allows the valve to create a tight seal when the gate is fully closed, effectively blocking the flow of water. The wedge shape of the gate ensures that it fits securely against the valve seat as it descends, minimizing leaks and preventing water from passing through.

In this mechanism, the handle or handwheel is turned, which raises or lowers the gate mechanism. When the gate is fully lowered, it obstructs the flow path, halting the movement of water. This type of valve is particularly effective for applications where a straight, unobstructed flow is needed when open, and it is commonly used in scenarios where the flow needs to be completely turned off rather than throttled.