What are the minimum and maximum pressure settings for hydrostatic relief valves in liquid piping?

The minimum and maximum pressure settings for hydrostatic relief valves in liquid piping are indeed 400 psi and 500 psi, respectively. These settings are established based on safety standards to ensure that the valve will function effectively in the event of excess pressure buildup within the system.

A hydrostatic relief valve is crucial for protecting the integrity of liquid piping systems containing liquefied petroleum gas (LPG) by allowing excess pressure to be released safely. If the pressure exceeds 500 psi, the valve is designed to open and discharge the liquid to prevent potential ruptures or failures of the piping system. Conversely, if the pressure drops below 400 psi, the valve remains closed, ensuring that the system maintains sufficient pressure for efficient operation.

This range is set to reflect both safety and operational efficiency, aiming to balance preventing overpressure while avoiding too frequent valve actuation, which could be costly in terms of product loss and system reliability. Understanding these pressure settings is vital for anyone involved in the installation, maintenance, or operation of LPG systems, as it directly relates to ensuring the safety and performance of those systems.