Patent ID: 7896976

Claim:
A pipe ventilating device for a discharge pipe for removing a flow medium to be pumped to a water-conducting household appliance, the pipe ventilating device comprising: a pipe ventilating valve connectable by a channel to a discharge pipe wherein a discharge flow medium to be pumped off flows through the discharge pipe, the pipe ventilating valve having an opening and a valve body for closing and opening the pipe ventilating valve opening; and a float chamber in which the valve body is disposed, the float chamber retaining therein a working medium with the working medium in the float chamber and the flow medium in the discharge pipe not being in contact with one another and the valve body floating in the float chamber such that valve body is moved into a seating position against the pipe ventilating valve opening to thereby close the pipe ventilating valve when the level of the working medium in the float chamber rises above a predetermined level and the valve body being moved out of its seating position against the pipe ventilating valve opening to thereby open the pipe ventilating valve when the level of the working medium in the float chamber drops below the predetermined level, the float chamber being connected to the discharge pipe by the channel and the channel being filled with a pressure medium such that a pneumatic force transmission takes place in that, when the discharge flow medium is flowing the discharge pipe, the discharge flow medium exerts a force on the pressure medium in the channel and the pressure medium in the channel, in turn, exerts a force on the working medium in the float chamber and this pneumatic force transmission effects a change in the level of the working medium of the float chamber.