Patent ID: 6860295

Claim:
A precision variable rate dispensing apparatus comprising: a support member; an eductor connected to the support member, the eductor having a inlet, an inlet for liquid concentrate and an outlet for a mixed solution; a needle valve assembly in fluid communication with the inlet for liquid concentrate, the needle valve assembly including a valve body, a needle member or reciprocal movement with respect to a passage to vary flow therethrough; a cam follower portion connected to the needle member; a cam member positioned between the cam follower member and the passage, the cam member having a cam surface with a first degree slope and a rapidly increasing second degree slope; the cam member and cam follower portion constructed and arranged so that when the needle member is turned in one direction, with the cam follower portion contracting the cam member, the valve will increase flow therethrough and when the needle member is turned in the opposite direction the valve will decrease flow therethrough.