Which valve type is known for having the least resistance to flow?

The ball valve is known for having the least resistance to flow due to its design. In a ball valve, the flow path has a spherical ball with a hole through its center. When the valve is open, the ball rotates so that the hole is aligned with the flow direction, allowing fluid to pass with minimal turbulence and resistance. This efficient flow path results in a high flow rate and is particularly advantageous in applications where quick on/off control is needed without significantly affecting system pressure.

In contrast, other valve types have designs that inherently cause more resistance. For instance, globe valves feature a convoluted path that creates more friction and pressure drop as flow passes through their internal structure. Similarly, while gate valves provide a straight-through flow when open, they are not as efficient as ball valves due to their sliding mechanism. Check valves, designed primarily to prevent backflow, also create resistance when fluid flows in either direction due to their internal mechanisms. Therefore, among the various types, the ball valve stands out for its low flow resistance.