HYDRAULIC CIRCUIT FOR LAVA SUPPORT Russian patent published in 2008 - IPC E21D23/16 E21D15/46 E21D23/26 

FIELD: mining.

SUBSTANCE: hydraulic circuit for lava support contains set of units (units of shield support), where hydraulic power drives (cylinders 4) and appropriate to it hydraulic operating valves (auxiliary valves 16 and main valves 17) are connected to forcing line (1) and supplying line, and also with drain line (2) and withdrawal line. In supplying line there is located check valve (9), overlapping the flowing of hydraulic fluid from appropriate power drive to forcing line and actuated for locking irrespective of command, delivered to hydraulic operating valve, and from position of these operating valves. Locking valve is preferentially implemented in the form of nonreturn valve, overlapping the flowing of hydraulic fluid from appropriate power drive (4) to forcing line (1).

EFFECT: invention allows improving of hydraulic systems and providing ability of upgrade reputed systems without essential expenses.

4 cl, 2 dwg