PUMP WITH CONTROLLABLE DELIVERY Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: pump has a bank of cylinders with pistons bearing on a slopping washer spring-loaded with a spring to the servo piston, regulator, and electrical-hydraulic valve whose inlet is connected to the delivery line and outlet is connected with the drain line and control line. The control line is in communication with space 15 of spring 8 of the regulator whose inlet is connected with line 12 of delivery and with space 17 of the servo piston through passageway 16. Line 14 connects space 15 with line 13 when the pump operates under nominal conditions. When the pump operates under load line 14 connects space 15 with line 12. EFFECT: improved design. 3 dwg