What is the primary purpose of a pressure vacuum breaker assembly?

The primary purpose of a pressure vacuum breaker assembly is backsiphonage prevention and isolation. This device is specifically designed to protect potable water supplies from contamination due to backsiphonage, which can occur when there is a drop in water pressure in the distribution system. The pressure vacuum breaker features a check valve and an air inlet port that work together to ensure that if there is a negative pressure situation, air can enter the system, breaking the vacuum and preventing any backflow of contaminated water into the clean water supply.

In addition to backsiphonage protection, the assembly also provides a level of isolation for the water source, separating it from the potential contaminants present in the connected system. This is critical for maintaining water safety standards and preventing health risks associated with contaminated water.

The other options, such as pressure regulation, flow measurement, or water heating, do not align with the primary function of a pressure vacuum breaker assembly. These aspects involve different types of equipment designed for distinct purposes, emphasizing that the primary focus of a pressure vacuum breaker is appropriately on backsiphonage and isolation, making it essential for protecting drinking water supplies.