What is the requirement for valves on the branch for each boiler fed from a common source of supply?

The requirement for valves on the branch for each boiler fed from a common source of supply is that a globe or regulating valve must be installed. This ensures that operators have precise control over the flow of steam or water to each boiler. The globe valve, in particular, is designed to provide better control of flow compared to other types of valves, making it ideal for applications where flow regulation is crucial.

In the context of boiler operations, having proper regulation is important for safety and efficiency. A globe or regulating valve allows for adjustments to be made to maintain optimal operating conditions, which can prevent issues such as overheating or improper pressure levels while also enabling maintenance procedures to be executed more safely.

Other options do not meet the necessary requirements. For instance, having no valves on the branch would not allow for control of the water or steam flow, undermining the reliability and safety of the boiler operation. Quick-opening valves, while useful in certain scenarios, may not provide the level of control needed for effective regulation; they allow for rapid opening and closing but lack the fine-tuning capability of a globe valve. Standard valves may not provide the specific functionality needed for regulation. Hence, the installation of a globe or regulating valve is essential for the proper operation of boilers fed from