What are the two types of safety valves used onboard naval vessels?

The correct answer identifies the two types of safety valves used onboard naval vessels as huddling chamber and nozzle reaction.

Huddling chamber safety valves utilize a chamber designed to allow the valve to close rapidly once the desired pressure is achieved, effectively preventing fluid from flowing back, and ensuring that the system maintains its operational integrity. This design is particularly useful in high-pressure applications, such as those often found on naval vessels.

Nozzle reaction safety valves work by utilizing the momentum of the fluid flowing through them to assist in opening and closing. They adapt to fluctuations in pressure and flow, providing a reliable means of regulating pressure within the system.

These two types of safety valves are critical for maintaining safe operation under varying conditions, especially in the demanding environments found in naval operations. The other options, while they describe legitimate concepts related to safety and pressure regulation, do not accurately represent the specific types of safety valves utilized on naval vessels.