Injection valve comprising a pump piston

摘要

The invention relates to an injection valve ( 1 ) comprising a booster piston ( 23 ), said piston delimiting a pump chamber ( 22 ) and a booster chamber ( 29 ). A valve ( 14 ) is provided in the inlet to the chamber ( 22 ). The valve is configured as a 3/2-way valve and controls the pressure in the pump chamber ( 22 ). The pressure in the pump chamber ( 22 ) is converted into a correspondingly increased pressure in the booster chamber ( 29 ) and in an injection chamber ( 34 ) containing an injection needle ( 6 ), by means of the booster piston ( 23 ). The use of the valve ( 14 ) allows a precise control of the injection times.