Patent ID: 6349858
Filing Date: 2002-02-26
Classification: B67D,F16K

Abstract:
A dispense head assembly comprising:a housing having a chamber disposed therein that extends from a partially-closed end to an opposite open end; a body attached to the housing open end and having a fluid passage disposed therein extending between opposite body ends, the fluid passage being in fluid-flow communication with a fluid inlet and a fluid outlet in the body, wherein the fluid passage includes a circular seal lip located between the fluid inlet and outlet; a piston disposed within the body and housing, the piston having a first end that extends through an opening in the partially-closed housing end, and a second end that is attached to a poppet/diaphragm, the poppet/diaphragm extending into the body fluid passage and including: an imperforate head that seats against the seal lip when placed into a closed position; a thin-walled sleeve that extends axially away from the head concentrically along a piston wall surface; and a tongue defining a terminal edge of the sleeve; a spring interposed between the piston and the partially-closed housing end to urge the poppet/diaphragm head against the seal lip; and a handle attached at one end to the piston first end to axially move the piston within the assembly between an opened and closed flow position; wherein the diaphragm sleeve rolls between opposite piston and assembly wall surfaces when the piston is moved axially within the assembly; a dip tube adapter connected to the dispense head assembly comprising: an adapter body comprising a fluid flow passage extending therethrough from a first end to an opposite second end; means disposed along the adapter body first end for forming a releasibly locking attachment with an end of the dispense head assembly body; a seal interposed between the dispense head assembly body and the adapter body, the seal including a first tongue projecting axially in one direction and a second tongue projecting axially in an opposite direction, and grooves disposed in the adapter body and the dispense head assembly body, the grooves having a wall thickness that is less than the wall thickness of a respective seal tongue to provide an interference fit therewith; and a dip tube attached to the second adapter body end.