HYDRAULIC SYSTEM Russian patent published in 2009 - IPC F15B13/01 F15B15/20 F15B11/02 F15B11/08 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to hydraulic drive and can be used in hydraulic systems of hoisting machine. Hydraulic system contains tank, pump, emergency valve, distributor, filter, hydraulic actuator, double-sided differential pilot-operated check valve, return valves and throttles. Additionally double-sided differential pilot-operated check valve in turn contains in body spring loaded from both sides piston with pushers, two return valves, on which pushers influence. In body of pilot-operated check valve there are installed fluid springs.

EFFECT: increasing of movements smoothness of final control element of hydraulic actuator along with reliability growth of operation.

2 cl, 2 dwg