structures of the ball valve

Stainless steel ball valve are generally reduced diameter and channel diameter indented two structures. In either configuration, the ball valve flow resistance coefficient are relatively small. Especially the so-called full-flow type, ie - port ball valves, due to its passage diameter equal to the inner diameter of the pipeline, local resistance loss only if an equal length of the pipe friction, that all the valves, this valve flow resistance is minimized. In the rocket launch and test system requires pipeline resistance as small as possible.
There are two ways to reduce the resistance of the piping system: First, reduce the fluid flow rate, which requires increasing the diameter and the valve size, which often have a negative impact on the economy of the pipeline system, particularly for low-temperature delivery system ( liquid hydrogen) is extremely unfavorable.