In the VIH sprinkler system, are the valves normally open or closed?

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Prepare for the CR-21 Landscapes and Irrigation Test. Utilize flashcards and multiple-choice questions featuring hints and explanations. Get exam-ready!

Multiple Choice

In the VIH sprinkler system, are the valves normally open or closed?

Explanation:
A Valve-In-Head (VIH) sprinkler is designed so the valve inside the head is normally open. That means, by default, the passage is open and water can reach the head as soon as the zone is commanded to operate. When the irrigation signal is given to stop the zone, the internal mechanism closes the valve to prevent further flow. This default open arrangement helps the system start quickly and avoids delays or residual water in the head. If it were normally closed, water wouldn’t reach the head without a signal, which isn’t how VIH heads are intended to function.

A Valve-In-Head (VIH) sprinkler is designed so the valve inside the head is normally open. That means, by default, the passage is open and water can reach the head as soon as the zone is commanded to operate. When the irrigation signal is given to stop the zone, the internal mechanism closes the valve to prevent further flow. This default open arrangement helps the system start quickly and avoids delays or residual water in the head. If it were normally closed, water wouldn’t reach the head without a signal, which isn’t how VIH heads are intended to function.

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