How does the pressure loss of a fully open ½" globe valve compare to flowing through pipe?

The pressure loss through a fully open ½" globe valve is typically equivalent to flowing through approximately 18.6 feet of straight pipe due to the valve's inherent design and flow characteristics.

Globe valves are known for their ability to control flow effectively; however, they also introduce a higher resistance to flow compared to straight sections of pipe. This is due to factors such as the valve's internal geometry, which leads to turbulence and energy dissipation when fluid passes through. The comparison of pressure loss to a certain length of pipe is a standardized method used to quantify how restrictive the valve is in systems where fluid dynamics are critical.

In hydraulic design, engineers use this benchmark to evaluate how various components—like valves—affect overall system performance. By knowing that the pressure drop of a fully open globe valve can be likened to 18.6 feet of straight pipe, one can better design piping systems for efficiency and ensure they maintain adequate flow rates while also managing pressure drops effectively.