US Patent 9970464 Pre-tensioning-pre-twisting full-bridge 2D electro-hydraulic proportional directional valve

A pre-tensioning-pre-twisting full-bridge 2D electro-hydraulic proportional directional valve can include a 2D valve, linear electro-mechanical converters at two ends of the 2D valve, and a compression-torsion coupling between the linear electro-mechanical converters. The 2D valve can include a valve core and a valve body, wherein the valve core is rotatably and axially slidably disposed inside an inner hole that is set along the axis line of the valve body. Each end shoulder of the valve core is provided with a pair of high pressure holes and low pressure holes, which are respectively communicated with a P opening and a T opening through an inner hole of the valve core.