Abstract: The present invention relates to a pump device with a first diaphragm pump head having two or an integral multiple of two fluid delivery chambers and diaphragms associated therewith, which are hydraulically coupled to a second diaphragm pump head. The second diaphragm pump head has two additional fluid delivery chambers and additional membranes associated therewith, which are drivable by a double-acting piston via associated diaphragm control chambers, a refilling valve being connected in each case to the diaphragm control chambers and the diaphragm control chambers being temporarily impinged with a diaphragm control pressure, which is greater than atmospheric pressure, using the refilling valve. The piston may thus be activated using a relatively small force to achieve a delivery action.

Abstract: The present invention relates to a pump device having a diaphragm pump head with two fluid delivery chambers, each fluid delivery chamber having a corresponding control chamber separated from the fluid delivery chamber by an associated diaphragm, a piston chamber in fluid communication with both fluid delivery chambers, and a double-acting piston assembly provided in the piston chamber and defining a single piston head that simultaneous acts upon both of the corresponding control chambers to drive the associated diaphragms.

Abstract: The present invention relates to a pump device with a first diaphragm pump head having two or an integral multiple of two fluid delivery chambers and diaphragms associated therewith, which are hydraulically coupled to a second diaphragm pump head. The second diaphragm pump head has two additional fluid delivery chambers and additional membranes associated therewith, which are drivable by a double-acting piston via associated diaphragm control chambers, a refilling valve being connected in each case to the diaphragm control chambers and the diaphragm control chambers being temporarily impinged with a diaphragm control pressure, which is greater than atmospheric pressure, using the refilling valve. The piston may thus be activated using a relatively small force to achieve a delivery action.

Abstract: A diaphragm piston pump with n (at least two) pump chambers each defined by a diaphragm, for mounting on a drive mechanism with n pistons, wherein the pump head with the diaphragms, the pump chambers and with covers is placed on the drive mechanism. The pump head is divided into n+l pump head elements which are arranged next to each other in a row in such a way that the respectively second pump head element forms the cover as well as the pump chamber for the previously arranged pump head element on which it is mounted, wherein the diaphragms are braced between the pump head elements and are aligned essentially parallel to the longitudinal axis of the pistons.