If boiler drain lines are used both as drains and blow offs, how many valves are required?

In systems where boiler drain lines are utilized for both draining and blow-off purposes, two valves are required to ensure proper operation and safety.

The first valve is necessary for the blow-off function, allowing for the removal of sediments and contaminants accumulated in the boiler. This is critical for maintaining the efficiency and safety of the boiler. The second valve is required as a drain valve to allow for the complete draining of the system when necessary, such as for maintenance or repairs.

Having two separate valves provides flexibility to operate the system efficiently while ensuring compliance with safety regulations. It allows the operator to perform blow-off procedures without affecting the drainage function or vice versa, thus enhancing the control over the boiler system.