Sample interview questions: Can you explain your knowledge of different types of backflow prevention devices used in hydronic systems?
Sample answer:
Can you explain your knowledge of different types of backflow prevention devices used in hydronic systems?
Backflow prevention devices are essential components of any hydronic system, as they prevent contaminated water from flowing back into the potable water supply. There are a number of different types of backflow prevention devices available, each with its own advantages and disadvantages.
Listed below are some of the most common types of backflow prevention devices:
- Double Check Valves: Double check valves are the most common type of backflow prevention device used in hydronic systems. They consist of two independent check valves that are installed in series. If one check valve fails, the other check valve will prevent backflow.
- Reduced Pressure Principle Assembly (RPZ): RPZ assemblies are a type of backflow prevention device that uses a pressure differential to prevent backflow. They consist of two check valves and a pressure-reducing valve. The pressure-reducing valve reduces the pressure in the system, which creates a pressure differential between the system and the potable water supply. This pressure differential prevents backflow.
- Air Gap: An air gap is a physical separation between the hydronic system and the potable water supply. This separation prevents backflow by preventing the water from flowing from the hydronic system to the potable water supply.
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