List one purpose of a blow-off valve in a boiler system.

The purpose of a blow-off valve in a boiler system is primarily to remove sludge and sediment that can accumulate within the boiler over time. This accumulation can occur due to impurities in the water supply and various chemical reactions that happen during the heating processes. If sludge and sediment are not removed, they can lead to reduced efficiency, overheating, and potentially damage to the boiler over time.

By allowing for periodic discharge of this debris, the blow-off valve helps maintain the boiler's operational efficiency and safety. This process assists in ensuring that the water used within the boiler remains clean and free from contaminants that can negatively impact heat transfer and system performance. Regular use of the blow-off valve is a crucial maintenance procedure to extend the life of the boiler and enhance its performance.