Nozzle group for injection valve has high pressure feed, outer nozzle valve, inner nozzle valve fitted to it to control flow through injection opening, hydraulically-connected control space, throttle device to dampen movement of inner valve

摘要

Nozzle group has base body with high pressure feed surrounded at least partly by channel holding an axially movable outer nozzle valve (27) which when closed cuts off the fluid flow through a first injection opening (24) and otherwise lets it through. It has an inner axially movable nozzle valve (29) on the outer valve which when closed cuts off the fluid flow through a second injection opening (36). It has a first control space (46) hydraulically connected to the body and bordering on the front of the inner valve on one side. The outer nozzle valve has a second supply channel (80), connected to body, which extends from the outer circumference of the outer valve to the channel (28) on the outer valve to a second supply volume (78) between inner and outer valves. It has a throttle device designed so that when the inner nozzle valve moves relative to outer valve against the shut off direction of the inner valve a hydraulic dampening of the movement of the inner valve is achieved through said throttle device.