Expro Engineering, Expro,actuator design, accurate metering orifice regulating, valve travel position error, hydraulic shock reducing, valve seat impact, high torque actuator, linear actuator, rotary actuator, spring return failsafe actuator, ceramic valve, servo motor, brushless motor, frameless motor, high temperature PMSM servo motor, motion control, IP65, IP67, IP68, IP69k, UL class H