What is the main operational difference between a relief valve and a safety valve?

The main operational difference between a relief valve and a safety valve lies in how they respond to pressure changes. A relief valve is designed to manage and relieve pressure in a system by opening partially under pressure conditions, allowing it to modulate the flow and maintain a certain set pressure level. This partial opening helps to prevent any abrupt pressure surges that could lead to system failure, ensuring a more controlled release of pressure.

In contrast, a safety valve is typically designed to open fully at a specific set pressure to prevent over-pressurization. The rapid and full opening provides a quick release of pressure, which is crucial in emergency situations where immediate relief is necessary. Understanding these distinctions is vital for effective system design and safety management in piping systems.