What about hydraulic systems and applications
During world war ii (1941-1945), 30% of American machine tools were applied to hydraulic transmission. It should be pointed out that the development of hydraulic transmission in Japan is more than 20 years later than that of the United States and Europe. In 1955, Japan rapidly developed hydraulic transmission and the "hydraulic industry meeting" was established in 1956. In the past 20-30 years, Japan's hydraulic drive has been developing rapidly, leading the world.
The pressure control valve is divided into the benefit flow valve (relief valve), pressure relief valve, sequence valve, pressure relay, etc. Flow control valves include throttle valves, adjustment valves, and diverter collector valves; Directional control valves consist of one-way valve, liquid control one-way valve, shuttle valve, reversing valve, etc. According to the control mode, the hydraulic valve can be divided into switch control valve, fixed value control valve and proportional control valve. The auxiliary elements include the oil tank, oil filter, tubing and pipe joint, sealing ring, pressure gauge, oil level oil temperature meter, etc. Hydraulic oil is the medium of the energy transfer energy in hydraulic system, there are various kinds of mineral oil, emulsified liquid and hydraulic oil.
A complete hydraulic system consists of five parts: the power component, the execution element, the control element, the non-piece and the hydraulic oil. The power element is used to convert the mechanical energy of the original motive into the liquid pressure energy, which is the oil pump in the hydraulic system, which provides the power to the whole hydraulic system. The hydraulic pump is structured in the form of gear pumps, vane pumps and plunger pumps. The function of the actuator, such as a hydraulic cylinder and hydraulic motor, is to convert the pressure of the liquid to the mechanical energy, and the driving load as a straight and reciprocating motion. The control element (i.e., various hydraulic valves) controls and regulates the pressure, flow and direction of the fluid in the hydraulic system. According to the control function, the hydraulic valve can be divided into the village force control valve, the flow control valve and the directional control valve.
