Which device is not typically used to prevent cross-connection in a water system?

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Multiple Choice

Which device is not typically used to prevent cross-connection in a water system?

Preventing cross-connection relies on devices that stop reverse flow into the potable water supply. A gate valve simply acts as a shut-off to isolate parts of the system; it does not provide any barrier against backflow or backpressure. It can block flow in one direction only when closed, but it doesn’t prevent contaminants from being drawn into the supply if a cross-connection is present. In contrast, a vacuum breaker helps prevent back-siphonage by allowing air to break a siphon, while reduced-pressure zone devices and double-check valve assemblies provide active backflow protection by creating pressure differentials and stopping reverse flow. For that reason, the gate valve is the one not typically used to prevent cross-connection.

Preventing cross-connection relies on devices that stop reverse flow into the potable water supply. A gate valve simply acts as a shut-off to isolate parts of the system; it does not provide any barrier against backflow or backpressure. It can block flow in one direction only when closed, but it doesn’t prevent contaminants from being drawn into the supply if a cross-connection is present.

In contrast, a vacuum breaker helps prevent back-siphonage by allowing air to break a siphon, while reduced-pressure zone devices and double-check valve assemblies provide active backflow protection by creating pressure differentials and stopping reverse flow. For that reason, the gate valve is the one not typically used to prevent cross-connection.

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