What type of valves must be present on a gravity fed boiler line?

The presence of a stop valve and a check valve on a gravity-fed boiler line is essential for both operational efficiency and safety. The stop valve serves to isolate the boiler from the system, allowing for maintenance and repairs without having to drain the entire system. This is vital in preventing water loss and maintaining the system's integrity.

The check valve, on the other hand, is crucial for preventing backflow. In a gravity-fed system, water needs to flow in one direction to ensure proper heating and operational functionality. The check valve ensures that, in the event of a drop in pressure or a potential backflow situation, the water does not reverse course and flow back into the line or the boiler, which could cause operational issues or even damage to the system.

Together, the stop valve and check valve provide a safe and efficient means of managing the water supply to the boiler, making them necessary components of a gravity-fed boiler line.