【正文】 Media work in 1905 will be replaced by oilwater and further improved. World War I (19141918) after the extensive application of hydraulic transmission, especially after 1920, more rapid development. Hydraulic ponents in the late 19th century about the early 20th century, 20 years, only started to enter the formal phase of industrial production. 1925 Vickers (F. Vikers) the invention of the pressure balanced vane pump, hydraulic ponents for the modern industrial or hydraulic transmission of the gradual establishment of the foundation. The early 20th century Constantine (G ? Constantimsco) fluctuations of the energy carried out by passing theoretical and practical research。s hydraulic drive, set up in 1956, Hydraulic Industry. Nearly 20 to 30 years, the development of Japan39。 operating machinery engineering machinery, construction machinery, agricultural machinery, automobiles, etc.。 civil water projects with flood control the dam gates and devices, bed lifts installations, bridges and other manipulation of institutions。 ship deck crane (winch), the bow doors, bulkhead valves, such as the stern thruster 。 militaryindustrial control devices used in artillery, ship antirolling devices, aircraft simulation, aircraft retractable landing gear and rudder control devices and other devices. Hydraulic fluids are a large group of fluids used as the motive medium in hydraulic machinery. Fluid types include synthetic pounds, mineral oil, water, and waterbased mixtures. The fluids are found in machinery and equipment ranging from brakes, power steering systems. Hydraulic systems are very mon in aircraft flight control systems. Hydraulic systems like the ones mentioned above will work most efficiently if the hydraulic fluid used has low industrial hydraulic systems operate at hundreds to thousands of PSI and temperatures reaching hundreds of degrees Celsius, severe injuries and death can result from ponent failures and care must always be taken when performing maintenance on hydraulic systems. Fire resistance is a property available with specialized use of hydraulic systems in aircraft almost certainly began with braking systems.[citation needed] As aircraft performance increased in mid20th century, the amount of force required to operate mechanical flight controls became excessive, and hydraulic systems were introduced to reduce pilot effort. The hydraulic actuators are controlled by valves。s main engines. Many aircraft equipped with the M61 family of cannon use hydraulic power to drive the gun system, permitting reliable high rates of fire. The hydraulic power itself es from pumps driven by the engines directly, or by electrically driven pumps. Electric pumps can provide both redundancy and the means of operating hydraulic systems without starting the engines, which can be very useful during maintenance. Aircraft hydraulic fluids fall under various specifications: Exposure to hydraulic fluids occurs mainly in the workplace. Drinking certain types of hydraulic fluids can cause death in humans, and swallowing or inhaling certain types of hydraulic fluids has caused nerve damage in animals. Contact with some types of hydraulic fluids can irritate your skin or eyes. These substances have been found in at least 10 of the 1,428 National Priorities List sites identified by the Environmental Protection Agency (EPA). What is hydraulic fluids? Hydraulic fluids are a large group of liquids made of many kinds of chemicals. They are used in automobile automatic transmissions, brakes, and power steering。 tractors。 industrial machinery。reg。reg。reg。reg。reg。reg。reg。reg。 some will burn and some will not burn. Certain hydraulic fluids are produced from crude oil and others are manufactured. What happens to hydraulic fluids when it enters the environment? Hydraulic fluids can enter the environment from spills, leaks in machines that use them, or from storage areas and waste sites. If spilled on soil, some of the ingredients in hydraulic fluids will stay on top and others will sink into the groundwater. In water, some hydraulic fluids39。t known. Fish may contain some hydraulic fluids if they live in contaminated water. How might I be exposed to hydraulic fluids? Touching or swallowing hydraulic fluids. Breathing hydraulic fluids in the air near machines where hydraulic fluids are used. Touching contaminated water or soil near hazardous waste sites or industrial manufacturing facilities that use or make hydraulic fluids. How can hydraulic fluids affect my health? Little is known about how hydraulic fluids can affect your health. Since hydraulic fluids are actually mixtures of chemicals, some of the effects seen may be caused by additives in the hydraulic fluids. In people, the effects of breathing air with high levels of hydraulic fluids are not known. Drinking large amounts of some types of hydraulic fluids can cause pneumonia, intestinal bleeding, or death in humans. Weakness of the hand