Sperrventil zur Durchflußmengenbegrenzung

摘要

The shut-off valve 8 prevents fuel flowing uncontrollably into the engine cylinder if the injection nozzles are defective. The valve has an actuator 14 which is movable in a valve chamber 15 between a closed and an inoperative position; in an intermediate position fuel flows through at least one throttle 24. A spring 13 biases the actuator to the inoperative position. The actuator has a closing head 23 with a pressure surface which, in the inoperative position, is acted upon by fuel pressure on the pump side over a partial surface 26 which is smaller than the total surface acted upon in the closed or intermediate positions in a ratio such that, on starting, the actuator 14 is opened from the inoperative position only when a pressure is applied to the partial surface to move the actuator against the spring force. Thus the pressure needed to move the shut-off valve 8 out of the inoperative position is appreciably higher than that needed to move it out of the intermediate position.