Differences between safety valves and pressure reducing valves

Safety valves and pressure reducing valves (PRVs) are both crucial for pressure control in industrial systems, but they serve different functions.

Safety Valves

Safety Valve: Function and Operation

A safety valve is designed to protect equipment from overpressure. It remains closed under normal conditions and opens automatically when pressure exceeds a preset limit. By releasing excess pressure, it prevents system failure or accidents. Safety valves are commonly used in boilers, pressure vessels, and piping systems. They must pass a pressure test before use.

Main Function: When the system pressure exceeds the safe limit, the safety valve opens to release media, preventing dangerous overpressure.

Pressure Reducing Valve

Pressure Reducing Valve: Function and Operation

A pressure reducing valve (PRV) regulates and maintains a stable outlet pressure by reducing the incoming pressure to a desired level. It works by adjusting the flow area to reduce pressure, ensuring consistent pressure downstream, regardless of changes in input pressure.

Main Function: The PRV ensures a constant downstream pressure by adjusting the flow to maintain a steady output, even with fluctuating input pressure.

Safety Valves release pressure when it exceeds a safe limit to protect systems.

Pressure Reducing Valves regulate and maintain a stable pressure to ensure consistent operation.

Both valves are essential for different pressure management needs, ensuring system safety and efficiency.