In order to verify the strength and static and dynamic characteristics, the finite element model and a simulation model of the valve proposed above are built. Electric-displacement feedback is adopted to realize precise control of the main valve port flow and the features of this valve are investigated. A longer concentric cylindrical annular gap is set to effectively prevent the ultra-high-pressure oil from flowing to the pilot stage and a seated valve structure is set to form the linear sealing zone in the closing state of the main valve port. In this study, a nominal diameter 25 mm (DN25) cartridge valve is taken as the research object. For an ultra-high-pressure hydraulic transmission system of a large-size hydraulic forging press (LHFP), a 70 MPa two-way proportional cartridge valve has been developed to improve the power weight ratio of the hydraulic forging press.
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