SCRAPER HYDRAULIC SYSTEM Russian patent published in 2016 - IPC E02F3/65 E02F9/22 

FIELD: machine building.

SUBSTANCE: claimed hydraulic system comprises three-section hydraulic pressure control valve, pipe lines, three actuating hydraulic cylinders and extra two-section hydraulic pressure control valve, one section of the latter being meant for control over one hydraulic cylinder another one control several hydraulic cylinders. Note here that two sets of hydraulic cylinders are connected in parallel to one of the sections of said extra two-section hydraulic pressure control valve. Note also that one of said section is connected by blind side while another one with two sets of hydraulic cylinders is connected by rod end. Note that one of set sets of hydraulic cylinders is connected via pressure valve. Downstream of the latter and parallel therewith arranged is the check valve to open from the side of pressure valve.

EFFECT: multistep control over three sets of hydraulic cylinders by one section of hydraulic pressure control valve.

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