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To satisfy the design requirements for a hydropneumatic spring damper valve, the inlet–outlet pressure drop (Δ<i>P</i>) and the axial force on the spool (<i>F_Z</i>) of a valve were investigated using fluid–solid coupling simulations and multi-objective optimization, along with the effects of the diameters of three internal holes (<i>D_A</i>, <i>D_B</i>, and <i>D_C</i>) in the valve on the Δ<i>P</i> and the <i>F_Z</i>. First, a meshed computational fluid dynamics model of a damper valve was established based on its geometric structure. Next, the effects of the flow rate (Q) and the diameter of the damping hole in the internal structure on the Δ<i>P</i> and the <i>F_Z</i> of the damper valve were investigated. The results showed that the Δ<i>P</i> and the <i>F_Z</i> varied nonlinearly with Q. For a given Q, the Δ<i>P</i> decreased as <i>D_A</i>, <i>D_B</i>, and <i>D_C</i> increased. For a given Q, the <i>F_Z</i> was not related to <i>D_A</i> and <i>D_C</i>, but it decreased as <i>D_B</i> increased. Finally, the structure of the damper valve was optimized by defining the Δ<i>P</i> and the <i>F_Z</i> as the response variables and <i>D_A</i>, <i>D_B</i>, and <i>D_C</i> as the explanatory variables. The results showed that the best configuration of the hole diameters was <i>D_A</i> = 8.8 mm, <i>D_B</i> = 5.55 mm, and <i>D_C</i> = 6 mm. In this configuration, Δ<i>P</i> = 0.704 MPa and <i>F_Z</i> = 110.005 N. The Δ<i>P</i> of the optimized valve was closer to the middle value of the target range than that of the initial valve design. The difference between the simulated and target values of the <i>F_Z</i> decreased from 0.28% to 0.0045%, satisfying application requirements.