As an important component of the variable ballastsystem (VBS), an key subsystem of submersible, seawaterhydraulic solenoid shut-off valve(SSV) functions as a transporthub which controls the discharge and injecting of variableballast cabin. Through theoretical analysis, temperature risewas found to be a main cause of the SSV’s failure. In order toimprove the reliability of the SSV, two experimental apparatuswere built to test the characteristics of the solenoids and thereliability of the SSV. Result shows variable voltage driving isan effective way of reducing the failure, which can sharplyrestrain the temperature rise of the solenoids. Moreover, anoptimal action cycle was found in which the solenoid valve has alonger continuous on-off time between failures (CTBF) andshorter response time.
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