What valve is typically known as a "Pressure relief valve" in plumbing systems?

In plumbing systems, a pressure relief valve is designed to protect the system from excessive pressure, which can occur due to thermal expansion or other factors. When the pressure in a pipe or system exceeds a predetermined level, the valve opens to release some of the fluid, thereby preventing potential damage to the system or other components.

Pressure relief valves are essential in many applications, including water heaters, where they help to ensure that the pressure does not exceed safe limits, thus avoiding dangerous situations like bursting tanks or piping. They are typically adjustable to set the desired pressure threshold, and are often spring-loaded to respond quickly to changes in pressure.

This valve is distinguished from other types of valves such as check valves or gate valves, which serve different functions in a plumbing system. Understanding the role and mechanism of a pressure relief valve is crucial for anyone working in plumbing, as it plays a key part in maintaining safety and reliability in fluid systems.