What is the effect of a non-return valve when putting a second boiler online?

A non-return valve, often known as a check valve, is specifically designed to prevent backflow in a system. When a second boiler is being put online, the non-return valve ensures that water or steam flows in only one direction, preventing any backward flow that could potentially disrupt the operation of the boilers. This is crucial because backflow could lead to contamination, inefficiency, and possible damage to the system.

Ensuring flow in only one direction helps maintain system integrity and efficiency, especially in scenarios where multiple boilers might otherwise interfere with one another. The reaction of the system components remains stable, and the risk of thermal or pressure imbalances is reduced, allowing both boilers to operate effectively without impacting each other's performance.