Special Applications in Mobile Hydraulics Including Electro-Hydraulic Proportional Technology

The requirement for reliable, precise positioning of functions without reciprocal influence, promoted the development of an alternative to the “6-way system” the 4-way system in mobile hydraulics. Lower horsepower consumption, remote controllability, built-in position feedback and manual operation in emergencies are the prime design criteria. When precision control is required, electro-hydraulic proportional control offers the best solution. This new concept in mobile hydraulics could find its application in special machines such as: airfield extinguisher vehicles, heavy load transporters, aeriel ladders. The basic concepts of hydraulic and electro-hydraulic control for these special applications are discussed in this paper.