Slider, in particular for controlling a pneumatic rock drilling machines

摘要

A power operated pressure fluid valve for controlling the impact power of a rock drill by establishing not only fully opened and fully closed positions, but also a restricted flow position. The valve comprises a main valve body which is transversely movable into the through-passage of the valve for blocking the through passage, and an auxiliary valve body movable within a coaxial bore of the main valve body for controlling transverse, restricted flow openings in the main valve body. The valve bodies are activated into their fully closed positions by pressure fluid introduced into a power cylinder surrounding their rear ends.