What is the role of the relief valve in an RPZ assembly?

The relief valve in a Reduced Pressure Zone (RPZ) assembly plays a critical safety role by discharging water when the pressure in the system drops below a specified level. This is essential for maintaining the effectiveness of the backflow prevention mechanism.

When the pressure differential occurs, typically during backflow conditions or when there is a sudden drop in supply pressure, the relief valve acts as a safeguard. It allows water to be expelled, thereby preventing backpressure from allowing contaminants to enter the safe water supply. This function helps to ensure that the system remains effective in protecting the potable water supply from potential contamination caused by backflow.

Understanding this role underscores the importance of maintaining the relief valve as part of normal operation and regular inspections of an RPZ assembly to ensure that it is functioning correctly.