Oscillating armature pump

An oscillating armature pump for conveying a liquid, having

• a pressure cylinder,
• a working cylinder,
• a working piston that has a piston part that is configured to be guided in the pressure cylinder and to delimit a pressure chamber together with the pressure cylinder, and that has a magnet element that is configured to be guided in the working cylinder, the working piston being configured to be set in stroke motion, in particular oscillating stroke motion, along a working axis in order to enlarge and/or reduce a volume of the pressure chamber, wherein the working piston has at least one first connection point that is configured to connect the piston part and the magnet element to one another and to transmit forces having any direction from the magnet element to the piston part along the working axis, wherein the working piston has at least one inlet valve that is arranged in a cavity in the piston part and is configured to regulate a passage of the liquid out of the working cylinder into the pressure cylinder,
• wherein the inlet valve has a valve spring having a conical or partially cylindrical shape,
• wherein the valve spring is designed as a compression spring that is configured to pull a sealing body into a sealing seat molded on the piston part.