Patent ID: 6405907
Filing Date: 2002-06-18
Classification: B67D,F04B

Abstract:
A polymer molded fully integrated pump for use in holding and dispensing fluid from a drum, comprising a container, and the pump means for delivering fluid from said container, said pump including a cylinder, said cylinder having upper and lower ends, the lower end of the cylinder incorporating a closure cap having a fluidic seal thereat, the closure cap having an inlet therethrough, a low profile flapper valve normally closing the inlet, but capable of opening during pump operation, the upper end of the cylinder having a cap ring applied thereto and forming a fluidic seal thereat, said cap ring capable of securing within the bung opening of the drum, a pump rod and plunger piston located within the cylinder, and capable of shifting vertically therein during the stroking of the pump, said plunger piston having at least one passage provided therethrough, a low profile flapper valve provided upon the plunger piston which in cooperation with the vertical shifting of the pump rod during actuation provides for recharging and dispensing of any fluid contained within the drum, whereby usage of said first and second flapper valves within the cylinder provides for a maximum stroke of operation for the piston rod and plunger piston within the cylinder during operations of the said drum pump.