The 21st century will be a century of informatization, networking, and knowledge-based development. The increasing progress of new technologies such as information technology, life sciences, biotechnology, and nanotechnology will have a profound impact on the research, design, and methods of hydraulic transmission and control technology, the structure and process of various hydraulic products including hydraulic valves, their application fields, and the management models of enterprises, bringing revolutionary changes.

Hydraulic valve is a functional unit in fluid transmission. On the one hand, the optimization and upgrading of fluid transmission systems require hydraulic valves to improve their performance accordingly; On the other hand, the innovation of hydraulic valves themselves has also brought new vitality to fluid systems. Nowadays, hydraulic valves have made great progress in terms of volume, performance, energy consumption, intelligence, manufacturing and processing technology. With the integration of hydraulic systems with electronic technology, IT technology, and network technology, hydraulic valves have entered the digital age.

Under the strong push of social and engineering demands, as well as the challenges of mechanical and electrical transmission and control, hydraulic transmission and control technology will rely on science, continuously leverage its own advantages, meet objective needs, become more green, integrated with mechanical and electronic systems, modular, intelligent, and networked, and push itself to a new level. The development history of hydraulic transmission, hydraulic transmission and pneumatic transmission are called fluid transmission, which is an emerging technology developed based on the principle of hydrostatic transmission proposed by Pascal in the 17th century.

Hydraulic transmission has many outstanding advantages, so its application is very extensive, such as in general work. Industrial plastic processing machinery, pressure machinery, machine tools, etc; Engineering machinery, construction machinery, agricultural machinery, automobiles, etc. in walking machinery; Metallurgical machinery, lifting devices, rolling mill adjustment devices, etc. used in the steel industry; Flood control gates and embankment devices, riverbed lifting devices, bridge control mechanisms, etc. used in civil and hydraulic engineering; Turbine speed control devices in power plants, nuclear power plants, etc; Deck lifting machinery (winches), bow doors, bulkhead valves, stern thrusters, etc. for ships; Giant antenna control devices, measuring buoys, lifting and rotating stages for special technologies; Artillery control devices, ship anti roll devices, aircraft simulation, landing gear retraction devices, and rudder control devices used in military industry.

At present, in the development of hydraulic technology in the world, China's construction machinery hydraulic parts industry has been using a large number of foreign hydraulic components. However, since 2010, China's hydraulic components have formed a complete range of production and research systems with certain production capacity and initial scale. Specialized manufacturers of accessories have occupied a certain proportion. However, problems such as outdated product technology, unreasonable product structure, and unstable product quality still constrain the further development of China's supporting parts industry, and are also the main reasons for the overall quality and reliability level of the host. Diesel engines, transmissions, hydraulic pumps, hydraulic motors, hydraulic valves, and other components commonly suffer from the "three leaks" problem. The percentage of hydraulic system failures is quite high. About half of hydraulic system failures are caused by leakage due to accelerated aging and failure of seals, assemblies, and other components. The problem of short service life of hydraulic pumps, hydraulic motors, and bearings is also prominent.