Arrangement for influencing the operating quantity of a servo-motor

摘要

The invention relates to a fluid pressure supply system for controlling a servomotor and in particular the forward speed of the servomotor, such as the raising speed of a fork lift truck, independently of the actual loading on the servomotor. This is accomplished with the combination of a pressure responsive regulating and reducing valve and a throttle valve in the supply branch of the circuit. The pressure regulating and reducing valves have setting elements that are loaded in opening directions by desired value springs and by a pilot pressure tapped between the reducing valve and the throttle valve.