Liquid pump dispenser having a stationary spout

A liquid pump dispenser comprising, a pump body mountable in a fluid tight manner on a container of flowable product to be dispensed, an upstanding stationary pump piston on said body, a valve controlled inlet within said body, a manually reciprocable spring biased plunger head having a plunger skirt in sealing engagement with said piston for therewith defining a variable volume pump chamber, a stationary spout on said pump body defining a discharge passage extending from said pump chamber, a discharge valve acting between said pump chamber and said discharge passage, an annular sleeve on said body surrounding said piston in spaced relationship and therewith defining a vent chamber openable to the atmosphere, said body having means defining a vent passage extending from said vent chamber into the container, an annular vent seal on said plunger skirt in sealing engagement with an inner wall of said sleeve for sealing said vent chamber closed in an upper position of said plunger head relative to said piston, and means on said inner wall for breaking the sealing engagement between said vent seal and said inner wall in a lowered position of said plunger head relative to said piston for venting the interior of the container to atmosphere.