This Lochinvar Relief Valve is a safety device designed to control or limit the pressure in a system by releasing excess pressure when it reaches 30 pounds per square inch (PSI). The valve operates automatically, opening to relieve pressure and then closing once the system returns to its normal operating conditions. It is constructed from durable materials that can withstand high temperatures and pressures, ensuring long-lasting performance. The valve is also easy to install, making it suitable for various applications in heating, cooling, and water supply systems.