A Bellows Sealed Pressure Relief Valve (PRV) is a crucial safety component used in steam systems to protect equipment from overpressure conditions. It is designed to automatically release excess pressure from a system to prevent damage to piping, vessels, and other equipment. The key feature of this valve is the bellows seal, which ensures a leak-tight seal while preventing external contamination from entering the valve body.

A Pilot-Operated Pressure Relief Valve (PRV) is a type of pressure control valve that uses a pilot valve to control the operation of the main valve. This type of PRV offers more precise and reliable pressure regulation, especially in large and high-flow steam systems where maintaining a stable pressure is critical.