USAGE REGULATOR Russian patent published in 1997 - IPC

FIELD: hydraulic drives of machine tools. SUBSTANCE: device has input controlled constrictor, which is connected to pumping line through pressure difference valve. In addition device has output controlled constrictor, which input is connected to one of operation channels of hydraulic drive and which output is connected to drain channel. In addition device has flow splitter which is designed as input and drain pressure valves. Drain valve has differential slide. Plunger is inserted between plunger end of slide valve and spring control chamber. Differential control chamber of drain slide valve is connected to input of drain constrictor. Plunger chamber is connected to output of drain constrictor. Affluent valve is inserted in order to eliminate possible alternations at output of drain valve. EFFECT: increased stability of operations in wide liquid control range, prevention of constrictor flaws obliteration for low liquid flow. 2 cl, 1 dwg