Proportioning pumping device and valve arrangement

摘要

A metering pump device, particularly for a heating appliance has a pump arrangement for the delivery of liquid which can be supplied via an inlet region to an outlet region and also a valve arrangement by means of which the pump arrangement can be selectively brought into connection with the inlet region to receive liquid or into connection with the outlet device for the delivery of liquid. The valve arrangement has a valve member that can be brought into a first actuating position and into a second actuating position. The first actuating position the valve member permits a liquid flow from the inlet region to the pump arrangement and prevents a liquid delivery from the pump arrangement to the outlet region, and in the second actuating position the valve member prevents a liquid supply from the inlet region to the pump arrangement and permits a liquid delivery from the pump arrangement to the outlet region.