MEDIUMDURCHFLUSS- UND DRUCKREGELVENTIL FUER HYDRAULIKMOTOREN

摘要

A hydraulic flow and pressure regulator control comprising a spool type valve which is self-centering and blocks a hydraulic fluid supply port in the centered position. Opposite ends of the valve spool are disposed in opposed chambers which are operable to receive pilot pressure fluid and fluid from the working discharge port of the valve, respectively. Shuttle valves disposed in the spool and the opposed chambers provide for reversible operation of the spool valve. The pressure regulator spool valve is operated to control flow, direction of flow, and pressure by a pressure differential control valve which can be manually operated to supply fluid at variable pressure to either of the opposed chambers. The flow and pressure regulator control is particularly adaptable for control of hydraulic feed or pull-down mechanisms for rock drills.