What is the minimum blowdown percentage required for a spring loaded safety valve?

The minimum blowdown percentage required for a spring-loaded safety valve is typically set at 10%. This specification ensures that the valve properly resets after relieving pressure, maintaining safe operational conditions within the boiler system. If the blowdown is too low, the safety valve may exhibit chattering, which can lead to wear and premature failure. A blowdown of 10% strikes a balance, allowing for effective pressure regulation while also protecting the integrity of the safety valve and the boiler system as a whole. Therefore, adhering to this minimum percentage is crucial for safety and operational efficiency in high-pressure boiler settings.