Answer :
Final answer:
Check valves are crucial safety devices to prevent backflow, pressure relief valves protect equipment from over-pressure, and pressure vacuum valves maintain system balance in storage tanks. The correct option is b. Check valves.
Explanation:
Check valves are safety devices used on regulators, hoses, and torches to prevent reverse gas flow and protect against fires and explosions. These valves only allow fluid to flow in one direction, making them crucial in scenarios like preventing backflow during combustion processes.
In addition to check valves, pressure relief valves are also essential safety devices used to protect equipment from over-pressure occurrences in fluid processes. They are designed to relieve excess pressure either by bypassing fluid or venting it to the atmosphere.
