What is the primary function of a check valve in a feed water line to a steam boiler?

The primary function of a check valve in a feed water line to a steam boiler is to enable flow in one direction only. This is crucial for the operation of a steam boiler because it prevents backflow of water that has already entered the boiler. In the feed water line, it's essential that water flows toward the boiler to maintain the necessary water level for steam generation. If water were to flow back towards the source, it could lead to a variety of operational issues, including boiler damage or inefficiency in steam production.

Check valves are designed to close automatically if there is any attempt at reverse flow, thereby safeguarding the system. This one-way flow ensures that the boiler is continuously supplied with water while simultaneously preventing any potential contamination or flooding of the feed water source. Overall, the installation of check valves is critical in boiler systems to ensure operational integrity and safety.