a pressure generating chamber connected with at least two outlets for at least two liquid consuming devices and with an inlet said piston further including a distributor bore in which a distributor element is rotatably mounted which includes at least one conduit with an inlet port through which conduit in dependence upon the rotary position of the distributor element one of the liquid consuming devices is supplied with pumped liquid through a connecting conduit communicating with the pressure generating chamber to provide a piston pump sealing tightly and being producible to more lenient manufacturing tolerances it is proposed providing the distributor element with a separate conduit having each an inlet port for each liquid consuming device and providing a seal which seals the inlet ports relative to each other and is adapted to be acted upon by a compressive force to effect a seal application_number US 94488297 A description fig1 shows in longitudinal section a pump mechanism or piston pump for two liquid consuming devices the piston pump includes an essentially rotationally symmetrical pump housing 10 in which a cavity is formed by a central longitudinal bore or housing bore 12 provided at either end 21 23 of the pump housing 10 are orifices 20 and 11 respectively with the lower orifice 20 as seen when looking at the piston pump in its built in position serving as an inlet which is in fluid communication with a water reservoir not shown in the figure of the steam iron an elongated hole 25 which is open towards the upper end 23 is provided laterally on the pump housing 10 received in the housing bore 12 is a piston 14.