Where should a pressure relief valve be installed in a Hydronic piping system that has been reduced in pressure?

In a hydronic piping system, the pressure relief valve is a critical safety component designed to protect the system from overpressure situations. When the pressure in the system is reduced, the appropriate location for the pressure relief valve is on the low-pressure side. This is because the valve needs to be able to relieve excess pressure safely and effectively, preventing potential damage to the system components due to excessive pressure.

Installing the pressure relief valve on the low-pressure side ensures that it can open and release water at the right time, preventing the pressure from exceeding the design limits of the system. If it were placed on the high-pressure side, it would not be able to function correctly in relieving overpressure conditions.

Furthermore, positioning the valve near the expansion tank enhances its effectiveness, as the expansion tank is specifically designed to accommodate changes in water pressure and volume as it heats up and cools down. This strategic placement allows for efficient pressure management and helps maintain optimal operating conditions within the hydronic system.