HYDRAULIC PISTON PUMP Russian patent published in 1999 - IPC

FIELD: hydraulic transportation of solid loose materials; positive displacement pumps. SUBSTANCE: proposed pump can be used in different branches of industry for pumping abrasive polydispersional hydraulic mixtures and hydraulic transportation of materials of different coarseness, density and concentration in working liquids of any density and viscosity. Pump has paired cylindrical working chambers with hydraulically driven working pistons furnished with control chambers at end face filled with constant amount of control liquid and accommodating hydraulically driven control pistons whose rods are passed through working chamber end faces with seals and are connected with hydraulically driven working pistons. Piston position limit pickups are installed in end faces of control chambers for engagement with floating hydraulic driven control pistons. Piston and rod spaces of one control chamber are connected, respectively, with piston and rod spaces of other control chamber by branch pipes to provide overflow of control liquid at suction and delivery displacement of hydraulically driven working piston and ensure tight hydraulic coupling of working pistons. EFFECT: enhanced reliability of operation. 3 cl, 1 dwg