What is the primary role of a PRV in a steam system?

The primary role of a Pressure Relief Valve (PRV) in a steam system is to reduce pressure. PRVs are critical safety devices designed to open at a preset pressure and relieve excess steam. This prevents the pressure within the system from exceeding safe limits, which could lead to equipment failure, leaks, or catastrophic accidents.

By reducing pressure, PRVs help maintain the stability and safety of the steam system, ensuring that operational pressures remain within specified boundaries. This function is vital because steam systems often operate under high pressure, and the risks associated with overpressurization include not only damage to the system but also hazards to personnel and the surrounding environment.

While regulating flow is an important function in a steam system, it's usually managed by other devices like control valves rather than a PRV. Similarly, increasing temperature is not a role performed by a PRV, as it focuses solely on pressure management. Maintaining a level typically refers to fluid levels in a boiler or tank, which is also outside the scope of the PRV’s primary function. Hence, the focus on pressure reduction solidifies the PRV's critical role in ensuring safe and reliable operation in steam systems.