Device for draining an installation for measuring quantities of liquid on tank-trucks

The invention relates to a device for emptying a measuring system for liquid quantities on tank trucks, with a connection coupling (8) by means of which the device can be connected to a liquid tank, with a delivery valve (4) and with a connecting line (13) which connects the connection coupling and the delivery valve and has a volume counter with electronic measuring device (3), as well as a venting and de-venting device (2) for venting the device. The invention is characterized in that a lower emptying connection (7) is connected via a pump (5) to a receiving container, that the delivery valve (4) is arranged at a level above the emptying connection, that the venting and de-venting device (2) arranged at a level above the delivery valve (4) is connected to the connecting line (13), and that a control unit is connected to the venting and de-venting device and to the delivery valve in such a manner that during emptying of the device the delivery valve is blocked and the volume counter with electronic measuring device is deactivated.