PUMP Russian patent published in 1996 - IPC

FIELD: manufacture of pumps. SUBSTANCE: flexible member made in form of spring is mounted in control for engagement with piston and bush embracing it, Spring may be secured on piston 4. Bush is provided with stop for engagement with spring. Spring may be secured in bush for engagement with piston. Spring is provided with devices to adjust its working length, thus increasing range of control of output. EFFECT: control of pump output by holding gate of suction valve in open position during delivery stroke of pump. 4 cl, 2 dwg