Sample interview questions: Can you explain the different types of backflow prevention devices and their respective uses?
Sample answer:
Types of Backflow Prevention Devices and Their Uses:
- Air Gap: A physical separation between the supply and drain to prevent backflow due to suction or gravity. Typically used in fixtures such as sinks and water coolers.
- Atmospheric Vacuum Breaker (AVB): Installed on hoses or irrigation systems, this device prevents backflow by allowing air to enter the system if a negative pressure develops.
- Double Check Valve (DCV): Consists of two check valves that interlock in the closed position. It prevents backflow from both backpressure and back suction. Commonly used in residential water supply lines and hose connections.
- Pressure Vacuum Breaker (PVB): A combination of a check valve and an atmospheric vacuum breaker. It protects against both backpressure and back suction. Suitable for use in above-ground irrigation systems and landscape lighting fixtures.
- Reduced Pressure Zone (RPZ) Valve: The most comprehensive type of backflow prevention device, the RPZ valve protects against both backflow and cross-contamination. It is required in high-risk applications, such as industrial facilities, medical offices, and commercial kitchens.
- Spill-Proof Drain Line Interceptors (SDLI)… Read full answer
Source: https://hireabo.com/job/12_0_11/Backflow%20Prevention%20Technician