Hydraulic system is according to the PASCAL principle of fluid mechanics, to the liquid as the working medium, to the liquid internal pressure can carry out power (or energy) transfer, conversion and control of the transmission system, hydraulic system is the key to control mechanical equipment to complete various actions, its technical level and product performance will directly affect the degree of automation and reliability of mechanical equipment. The hydraulic system is generally composed of five parts, including power components, control components, executive components, auxiliary components and working media.
Hydraulic system components

The working principle of the hydraulic system is generally: the prime mover drives the hydraulic pump, the hydraulic pump pumps into the hydraulic pipeline, the hydraulic valve controls the flow rate and pressure of the hydraulic oil, so as to adjust the reciprocating speed and direction of the hydraulic cylinder. Compared with mechanical transmission and electric transmission, hydraulic system has irreplaceable advantages: under the same power, hydraulic system device capacity is large, small volume, small mass; Easy to achieve large transmission ratio, wide speed control range, can easily achieve stepless speed control in operation, while low speed performance is good; Easy to achieve rotary, reciprocating linear motion, the system is easy to arrange; System control, regulation is simple, easy to achieve mechanical automation; Simple operation, smooth work, quick response, small impact, easy to frequent, quick steering and start; Safe and reliable work, hydraulic system overload, easy to achieve overload protection; Hydraulic transmission with oil as the working medium, components can be self-lubricating, easy maintenance.
Advantages of hydraulic system

Based on the above advantages, the hydraulic system is widely used in all kinds of host products and technical equipment in various industries, such as construction machinery, mining machinery, port machinery, agricultural machinery, metallurgical machinery, automobile industry, machine tools and other fields.
Hydraulic system main application field

At present, the domestic listed enterprises in the hydraulic system industry mainly include Hengli Hydraulic, Shaoyang Hydraulic, etc. Jiangsu Hengli Hydraulic Co., LTD. (hereinafter referred to as "Hengli Hydraulic") is a professional production of hydraulic components and hydraulic systems. The company's products from hydraulic cylinder manufacturing has developed into a large comprehensive enterprise covering high pressure cylinder, high pressure plunger pump, hydraulic multiway valve, industrial valve, hydraulic system, hydraulic test bench and high precision hydraulic castings products research and development and manufacturing. The downstream application machinery of the company's hydraulic products include: walking machinery represented by excavators, underground tunneling equipment represented by shield tunneling machines, Marine engineering Marine machinery represented by ships and port machinery, special vehicles represented byhighaltitude working platforms, wind power and solar energy and other industries and fields. Downstream customers include: the United States Caterpillar, Japan Kobelco, Hitachi Construction machinery, Kubota Construction machinery, Sany Group, Xugong Group, Liugong Group, China Railway, Railway Construction Heavy Industry and other world top 500 and famous mainframe customers. Shaoyang Vic Hydraulic Co., LTD. (hereinafter referred to as "Shaoyang Hydraulic") is mainly engaged in the research, development, production and sales of various hydraulic components and hydraulic systems. Now the main products are CY series high pressure plunger pump, CY series high pressure plunger motor, PVB series light piston pump, PVB series light piston motor, various types of high pressure hydraulic valve and complete sets of hydraulic system, hydraulic cylinder. Shaoyang Hydraulic is one of the main comprehensive hydraulic enterprises in China, which can not only provide customers with the overall solution of hydraulic transmission, but also independently design and produce hydraulic pump, hydraulic cylinder and other core hydraulic components.
Introduction to the main listed enterprises in domestic hydraulic system industry

In terms of revenue, the total revenue of Hengli Hydraulic and Shaoyang Hydraulic in 2021 maintains an increasing trend. In 2021, the total revenue of Hengli Hydraulic has reached 9.309 billion yuan, an increase of 1.454 billion yuan compared with 2020. From January to September in 2022, the total revenue of Hengli Hydraulic has reached 5.920 billion yuan. In 2021, the total operating revenue of Shaoyang Hydraulic has reached 375 million yuan, an increase of 37 million yuan compared with 2020. From January to September in 2022, the total operating revenue of Shaoyang Hydraulic has reached 231 million yuan.
Total Revenue Statistics of Major Listed Enterprises in China's hydraulic System Industry from 2014 to 2022 (RMB 100 million)

From the perspective of hydraulic system business income, Hengli hydraulic system business income completed 196 million yuan in 2021, Shaoyang hydraulic system business income completed 128 million yuan.
Hydraulic system business revenue Statistics of Major listed enterprises in China Hydraulic System Industry in 2021 (100 million Yuan)
