Fuel-injection valves For K- and KE-jetronic: the valve needle is opened by overpressure (3.3 bar) interaction of valve needle, valve seat and spring For L-jetronic: function of the magnetic armature function of the valve needle description ordernumber 261 see also: common rail high-pressure pump (DELPHI) pressure-wave supercharger spiral-type supercharger hydraulic cold-start injection advane KSB