Correct option is B
A check valve is a one-way valve that allows fluid to flow in only one direction and prevents backflow. It operates automatically without manual intervention and is commonly used in pumps, pipelines, and fluid systems to maintain directional flow.
· Check valves work by using a disc, ball, or flapper mechanism that opens with forward flow and closes when the flow reverses.
· They prevent contamination, reverse flow damage, and pressure loss in piping systems.
· Common types of check valves include swing check valves, lift check valves, ball check valves, and diaphragm check valves.
