Perform a mechanical analysis of the axial movement of the spool. The valve core is mainly affected by the pressure pA0≠0 from the control chamber, the system pressure, the fixed difference spring force, the inertial force, the Coulomb friction damping force (not considered), the steady-state hydraulic force and the transient hydraulic force (because the hydraulic pressure is much larger than the hydraulic pressure). power, so it can be ignored here) and other influences. According to the force balance equation, we can get:
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