Hydraulic Spool Valve Web Geometry for Lower Annular Flow Loss

The patent applies local quality by making the second web longer than the first web in the circumferential direction. This asymmetric design creates different flow resistance characteristics in different control chambers, allowing the system to prevent annular flow in the second chamber while maintaining lower flow resistance overall. The localized modification of web length optimizes the balance between preventing wear/leakage and minimizing flow resistance.

The patent employs asymmetry by providing radial webs of different lengths in the first and second control chambers. The second web extends over a larger angle in the circumferential direction compared to the first web. This asymmetric configuration prevents annular flow and rotational movement of the control piston while minimizing the impact on fluid flow from the pump connection opening to the consumer connection opening.

The patent extracts the harmful rotational movement and annular flow from the system by introducing radial webs in the control chambers. These webs act as flow directors that prevent the fluid from creating rotational forces on the control piston, thereby eliminating the wear mechanism while preserving the functional benefits of having connection ports outside the central plane.

The radial webs serve as intermediary elements between the fluid flow and the control piston. They intercept and redirect the fluid flow in a controlled manner, preventing it from directly causing rotational movement of the piston. This intermediary structure allows the system to maintain connection ports outside the central plane for functional versatility while protecting the piston from wear.