What is the recommended installation height for an anti-siphon valve in relation to the highest emission device in the zone?

• A. 6 inches
• B. 12 inches
• C. 18 inches
• D. 24 inches

Answer: (B)

The recommended installation height for an anti-siphon valve is typically set at 12 inches above the highest emission device in the irrigation zone. This height is crucial for preventing backflow contamination and ensuring the system operates efficiently. By positioning the anti-siphon valve at this distance, it creates a physical separation that minimizes the risk of non-potable water entering the potable water supply due to unintended siphoning effects. This is particularly important in settings where chemicals or fertilizers might be utilized in the irrigation process, as it maintains water quality and complies with safety regulations.

While other heights are also options, they may not align with best practices endorsed by industry standards and regulations. For example, a height of 6 inches might not provide sufficient separation, and greater distances like 18 or 24 inches could be excessive, complicating the installation without added benefit. Thus, the 12-inch guideline strikes a balance between effective functionality and regulatory compliance.