An actuator/closing element combination for a dispenser of a dispensing system for flowable washing or cleaning agents includes a closing element in the form of an open/close valve element, and an actuator coupled to the closing element in such a manner that the closing element may be displaced by the actuator into a closure position and into a passage position, the actuator being configured such that, when driven by an appropriate pulse, it determinably occupies alternately one of two end positions and, without actuation, stably retains the end position reached, such that the actuator/closing element combination forms a pulse-controlled, bistable open/close valve.