Patent ID: 8534505

Claim:
Dispensing apparatus for liquid material comprising: a metering chamber and a dispensing member disposed in said chamber, said chamber having first and second material passages in fluid communication with corresponding first and second cavities extending to corresponding first and second inlet ports, said dispensing member being moveable between first and second positions in an alternating manner to dispense material from said first and second material passages through an outlet port in fluid communication with a third cavity between the first and second cavity, with material flowing out said first material passage as said dispensing member moves toward said first position and said material flowing out said second material passage when said dispensing member moves toward said second position, said dispensing member moving in response to fluid pressure at said first and second material passages such that when one of said material passages is acting as an inlet for the chamber, the other material passage acts as an outlet for the chamber; and an adjustment member extending into the metering chamber and including a stop portion adjustably positionable within the metering chamber to selectively define the second position of the dispensing member.