Device for conveying and dispensing liquid media

摘要

A device for conveying and dispensing liquid media such as casting resin has at least one piston pump having a cylinder chamber which forms a seal for a piston therein which is connected via an input opening to a feed container for receiving a supply of liquid therefrom. The cylinder chamber has an output opening and the piston is tubular in form having wall perforations in the region of the input opening for admitting the liquid to the interior of the piston and has a valve at a discharging end thereof for exit of the liquid from the piston. A seal is thus formed by which the piston operates entirely surrounded by the liquid medium to be dispensed and external seals between the piston and the atmosphere are eliminated.