Low pressure low volume liquid pump

摘要

A diaphragm pump which provides a low internal volume and minimizes volume contributions for applications which require the transfer of fluid volumes on the order of one to several microliters. The pump includes a plunger which reciprocates within a bore and applies fluid pressure to a diaphragm of a head cavity that is connected to the cylinder bore. Hydraulic feed and vent passages connect to the cylinder bore at a point where the end of the plunger passes during reciprocal movement to ensure that the amount of hydraulic fluid within the cylinder bore is consistent during each stroke of the plunger. The pump is particularly useful for supplying receptor media to a Franz cell.