Chapter I Introduction to Hydraulic and Pneumatic Transmission 1.3 Composing of Hydraulic Transmission System 1-Hydraulic pump 2-Adjustable throttle valve 3-Closed center directional valve 4-Hydraulic actuator 5-Working load 6-Relief valve 7-Filter 8-Reservoir (tank)-A container for storage Semi-structure sketch(visual) Symbol sketch (abstract) of liquid in a fluid power system. Figure.1-2 Principle of a typical hydraulic system Homepage List Upward达s Downwards Retumn ExitChapter 1 Introduction to Hydraulic and Pneumatic Transmission 6 1.3 Composing of Hydraulic Transmission System Figure. 1-2 Principle of a typical hydraulic system 1-Hydraulic pump 2-Adjustable throttle valve 3- Closed center directional valve 4-Hydraulic actuator 5-Working load 6-Relief valve 7-Filter 8-Reservoir (tank) - A container for storage of liquid in a fluid power system. Semi-structure sketch (visual) Symbol sketch (abstract)