Dispensing system

A pump especially adapted to be mounted in and on an hermetically sealed container and to remove and discharge fluid contained therein at an elevated discharge pressure, said pump having a discharge chamber, an intake chamber and a reciprocating valve body characterized in that the said intake chamber is mounted on said valve body and is contained entirely within said discharge chamber, said valve body is spring loaded, said discharge chamber comprises a housing having an open end and a closed end mounted on said container, a cooperating piston having an open ended bottom mounted in the open end of said housing, said spring loaded valve body is positioned between said housing and said piston, an upstanding stem is provided in the closed end of said housing and the lower end of said valve body comprises an open ended chamber forming said intake chamber and is mounted on said stem in sliding but sealed relation thereto, whereby said pump is pressure actuated and said discharge pressure is substantially independent of the pressure within said hermetically sealed container.