Which valve type is specifically prohibited for blowoff piping connections?

The prohibition of globe valves specifically for blowoff piping connections is based on their design and functionality. Globe valves are constructed to provide better throttling and flow regulation capabilities, but this design comes with inherent limitations when used in blowoff applications.

In blowoff systems, the goal is to rapidly discharge fluids or pressure to prevent damage or maintain system integrity, which requires a valve that can fully open and close quickly. Globe valves, due to their design, generally have a higher resistance to flow when fully open compared to other valve types, meaning they do not perform effectively in situations requiring rapid flow changes or complete flow obstruction.

Furthermore, the design of globe valves can lead to issues such as cavitation, erosion, or seating wear when they are frequently operated in a blowoff capacity. This can compromise the reliability and safety of the system. Therefore, regulations or best practices recommend avoiding the use of globe valves in blowoff piping systems, preferring valve types that can handle the specific demands of such applications more effectively, ensuring both performance and safety.