Final answer:
Cam-operated valves are mechanically activated by cam profiles or lobes, integral to controlling fluid or air flow in various industrial applications.
Step-by-step explanation:
Cam-operated valves are two position directional control valves (DCVs) mechanically activated by cam profiles or lobes. These valves are a part of hydraulic and pneumatic systems and play a crucial role in controlling the flow of fluids or air. When the cam rotates, its profile pushes against a follower mechanism attached to the valve, shifting the valve spool to switch positions, thereby changing the flow path. These types of valves are commonly found in internal combustion engines, automated machinery, and various industrial applications where precise timing and sequencing are necessary.