Anti-pumping dispense valve

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, a fluid transport chamber disposed within the housing and interposed between the fluid inlet and fluid outlet, the fluid transport chamber including an integral valve seat;
• an actuator housing attached to the fluid transport housing and including an actuator chamber in contact with the fluid transport chamber;
• a one-piece diaphragm/poppet assembly disposed within the fluid transport chamber comprising:
• a poppet having a head that is positioned downstream of the seat;
• and
• a movable diaphragm that is positioned upstream of the valve seat;
• actuator means disposed within the actuator chamber for moving the diaphragm/poppet assembly.

A dispense valve comprising:

• a fluid transport housing having a fluid transport chamber interposed between a fluid inlet passage into the housing and a fluid outlet passage out of the housing, the fluid transport chamber including a valve seat interposed between the fluid inlet and outlet passages;
• an actuator housing connected with the fluid transport housing and including an actuator chamber connected with the fluid transport chamber;
• an actuator assembly disposed within the actuator chamber;
• a diaphragm/poppet assembly in contact with the actuator assembly and disposed within the fluid transport chamber, the diaphragm/poppet assembly comprising:
• an elongate shaft defined by opposed first and second axial ends;
• a poppet head portion that is integral with a first end of the shaft and that is positioned downstream of the seat and in sealing
• communication with the seat when the valve is placed in a closed position;
• and
• a movable diaphragm that is positioned at the second end of the shaft on a side of the valve seat opposite from the head portion;
• means for controlling movement of the actuator assembly to move the poppet against the valve seat.