What is the required installation position for safety and pressure relief valves on boilers?

The required installation position for safety and pressure relief valves on boilers is with the spindle in the upright vertical position. This orientation is crucial for the proper operation of the valve, as it allows for the effective and reliable release of pressure. When the spindle is vertical, gravity aids the valve's mechanism, ensuring that it seals correctly when closed and opens promptly when needed to relieve pressure buildup.

In addition to enhancing safety, this position helps prevent potential issues such as entrapment of debris or improper seating, which could occur if the valve were installed at an angle or horizontally. Compliance with this requirement is vital for maintaining boiler efficiency and safety standards, as outlined in relevant codes. Proper installation minimizes the risks of overpressure situations that could lead to catastrophic failures or safety hazards.