This paper introduces a hydraulic synchronous system, which USES a new-type digital valve as synchronous controller and makes use of a fuzzy-PID control arithmetic.

In hydraulic synchronizing lifting technology for oversize structure, computer output PWM signal as the input current of proportional valve is used to control the velocity of hydraulic cylinder.

Synchronous valve is a type of components that have simple structure, reliable capability and low price in hydraulic synchronous control system.