Design of a 70 MPa Two-Way Proportional Cartridge Valve for Large-Size Hydraulic Forging Press

Abstract

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. In this study, a nominal diameter 25 mm (DN25) cartridge valve is taken as the research object. 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. Electric-displacement feedback is adopted to realize precise control of the main valve port flow and the features of this valve are investigated. 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. There is a little deformation which does not affect the main valve spool movement, and the main valve port flow meets the design demands. Then, the prototype of DN25 70TPCV is manufactured and a ultra-high-pressure experimental platform is developed. The experimental results show that the DN25 70TPCV designed in this study has the advantage of fast response, high control precision, and low leakage, which can meet the requirements of LHFPs.

Keywords

ultra-high-pressure / cartridge valve / large-size hydraulic forging press(LHFP) / proportional control / modelling