Patent ID: 6837484

Claim:
An anti-pumping dispense valve comprising: a fluid transport housing having a fluid inlet passage extending into the housing, a fluid outlet passage extending out of the housing, and a fluid transport chamber disposed within the housing and in fluid-flow communication with the fluid inlet and fluid outlet passages; a valve seat integral with the fluid transport chamber and interposed between the fluid inlet passage and fluid outlet passage; a one-piece diaphragm/poppet assembly disposed within the fluid transport chamber comprising: a imperforate poppet head at one axial end of the assembly and positioned within the fluid transport chamber downstream from the valve seat for placement against the seat to stop fluid flow through the fluid transport chamber; and a flexible diaphragm at an opposite axial end of the assembly and extending radially outwardly from the assembly; an actuator housing attached to the fluid transport housing and including an actuator piston assembly disposed therein that is in contact with the diaphragm/poppet assembly for moving the diaphragm/poppet assembly within the fluid transport chamber; and means for adjusting the actuator piston assembly stroke length disposed within the actuator housing.