It is a term of hydraulic machinery industry, electromechanical industry .Hydraulic power can be used as a hydraulic transmission. Hydraulic pressure can also be used as a control method, called hydraulic control.
Hydraulic transmission use liquid as the working medium, use liquid pressure energy to transfer power.
Hydraulic control is the control signal transmission mode using pressure liquid. Hydraulic control usually includes hydraulic open loop control and hydraulic closed loop control. Hydraulic closed-loop control is also called hydraulic servo control, usually including the electric hydraulic servo system and mechanical hydraulic servo system etc..
A complete hydraulic system consists of five parts, namely an energy device, an executive device, a control adjustment device (hydraulic valve), an auxiliary device and liquid medium. The hydraulic pressure is widely used in industry and civil industry because of its large transmission power, easy to transfer and configuration. The executive component of hydraulic system (hydraulic cylinder and hydraulic motor) is to convert the pressure energy into mechanical energy. The energy source of hydraulic system (hydraulic pump) is to convert the mechanical energy of the prime mover to the pressure energy of the liquid.
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