130. What is the primary operational difference between a nozzle reaction safety valve and a huddling chamber safety valve?

Nozzle reaction and huddling chamber safety valves differ primarily in the method used to control blowdown, which is the pressure drop during valve closure. Huddling chamber valves utilize a chamber to create a distinct pop and controlled reseating, while nozzle reaction valves rely on the reaction force of high-velocity steam flow. Relieving capacity, initial opening, and lifting pressure adjustment are not the defining operational differences.