Where must a shutoff valve be installed in a high-pressure boiler?

A shutoff valve must be installed in both the supply and return lines of a high-pressure boiler to ensure the safety and efficiency of the system. This configuration allows for complete isolation of the boiler from the rest of the system for maintenance, inspection, or emergencies. By having shutoff valves in both lines, technicians can easily control the flow of water and steam, which is crucial for managing pressure and temperature within the boiler.

In the event of a malfunction or when performing routine maintenance, being able to isolate the supply and return lines provides a safe environment to perform the necessary work without risking the system's integrity or creating danger to personnel. Additionally, in many jurisdictions, code requirements stipulate that shutoff valves need to be present at both the supply and return lines to meet safety regulations and ensure proper operation of the heating system. This approach not only enhances safety but also contributes to the overall efficiency of the boiler system.